Hydrogeochemical and multi-tracer investigations of arsenic-affected aquifers in semi-arid West Africa
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摘要
The semi-arid Sahel regions of West Africa rely heavily on groundwater from shallow to moderately deep(<100 m b.g.l.)crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic(As)concentrations(>10μg/L)stemming from the oxidation of sulphide minerals(pyrite,arsenopyrite)in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers(noble gases,~3H,stable water isotopes(~2 H,~(18)O))and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties(e.g.redox conditions,As concentrations,water level,residence time)over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short(<50 a)and long(>10~3 a)residence times as indicated by ~3He/~4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times>10~3 years already at depths of<50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future.
The semi-arid Sahel regions of West Africa rely heavily on groundwater from shallow to moderately deep(<100 m b.g.l.)crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic(As)concentrations(>10μg/L)stemming from the oxidation of sulphide minerals(pyrite,arsenopyrite)in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers(noble gases,~3H,stable water isotopes(~2 H,~(18)O))and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties(e.g.redox conditions,As concentrations,water level,residence time)over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short(<50 a)and long(>10~3 a)residence times as indicated by ~3He/~4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times>10~3 years already at depths of<50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future.
The semi-arid Sahel regions of West Africa rely heavily on groundwater from shallow to moderately deep(<100 m b.g.l.)crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic(As)concentrations(>10μg/L)stemming from the oxidation of sulphide minerals(pyrite,arsenopyrite)in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers(noble gases,~3H,stable water isotopes(~2 H,~(18)O))and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties(e.g.redox conditions,As concentrations,water level,residence time)over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short(<50 a)and long(>10~3 a)residence times as indicated by ~3He/~4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times>10~3 years already at depths of<50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future.
引文
Aeschbach-Hertig,W.,Peeters,F.,Beyerle,U.,Kipfer,R.,1999.Interpretation of dissolved atmospheric noble gases in natural waters.Water Resources Research35(9),2779-2792.https://doi.org/10.1029/1999wr900130.
Aeschbach-Hertig,W.,Solomon,D.K.,2013.Noble gas Thermometry in Groundwater Hydrology.The Noble Gases as Geochemical Tracers.Springer,pp.81-122.
Ahoule,D.,Lalanne,F.,Mendret,J.,Brosillon,S.,Maiga,A.,2015.Arsenic in African waters:a review.Water Air and Soil Pollution 226(9),1-13.https://doi.org/10.1007/s11270-015-2558-4.
Andrews,J.N.,1985.The isotopic composition of radiogenic helium and its use to study groundwater movement in confined aquifers.Chemical Geology 49(1-3),339—351.
Argos,M.,Kalra,T.,Rathouz,P.J.,Chen,Y., Pierce,B.,Parvez,F.,Islam,T.,Ahmed,A.,Rakibuz-Zaman,M.,Hasan,R.,Sarwar,G.,Slavkovich,V.,Van Geen,A.,
Graziano,J.,Ahsan,H.,2010.Arsenic exposure from drinking water,and allcause and chronic-disease mortalities in Bangladesh(HEALS):a prospective cohort study.The Lancet 376(9737),252-258.
Asante,K.A.,Agusa,T.,Subramanian,A.,Ansa-Asare,O.D.,Biney,C.A.,Tanabe,S.,2007.Contamination status of arsenic and other trace elements in drinking water and residents from Tarkwa,a historic mining township in Ghana.Chemosphere 66(8),1513-1522.
Bamba,0.,1996.L'or dissemine dans les albitites birimiennes de Larafella(Burkina Faso)et son evolution dans les alterites et les cuirasses ferrugineuses métallogenie-petrologie-geomorphologie.Universite Aix-MarseilleⅢ(in French).
Bamba,O.,Parisot,J.C.,Grandin,G.,Beauvais,A.,2002.Ferricrete genesis and supergene gold behaviour in Burkina Faso,West Africa.Geochemistry Exploration Environment Analysis 2(1),3-14.https://doi.org/10.1144/1467-787302-001.
Barbier,B.,Dembele,Y.,Compaore,L,2006.L'eau au Burkina Faso:usages actuels et perspectives.Sud Sciences et Technologies 14,20-29.
Barro-Traore,F.,Tiendrebeogo,S.R.M.,Lallogo,S., Tiendrebeogo,S.,Dabal,M.,Ouedraogo,H.,2008.Manifestations cutanees de l'arcenicisme au Burkina Faso:aspects epidemiologiques et cliniques.Mali Medical Tome XXIII(1)(in French).
Berg,M.,Trang,P.T.K.,Stengel,C., Buschmann,J.,Viet,P.H.,Van Dan,N.,Giger,W.,Stiiben,D.,2008.Hydrological and sedimentary controls leading to arsenic contamination of groundwater in the Hanoi area,Vietnam:the impact of ironarsenic ratios,peat,river bank deposits,and excessive groundwater abstraction.
Chemical Geology 249(1-2),91-112.https://doi.org/10.1016/j.xhemgeo.2007.12.007.
Beyerle,U.,Aeschbach-Hertig,W.,Hofer,M.,Imboden,D.M.,Baur,H.,Kipfer,R.,1999.Infiltration of river water to a shallow aquifer investigated with H-3/He-3,noble gases and CFCs.Journal of Hydrology 220(3-4),169-185.https://doi.org/10.1016/S0022-1694(99)00069-4.
Beyerle,U.,Aeschbach-Hertig,W.,Imboden,D.M.,Baur,H.,Graf,T.,Kipfer,R.,2000.A mass spectrometric system for the analysis of noble gases and tritium from water samples.Environmental Science and Technology 34(10),2042-2050.https://doi.org/10.1021/es990840h.
Beyerle,U.,Rueedi,J.,Leuenberger,M.,Aeschbach-Hertig,W.,Peeters,F.,Kipfer,R.,Dodo,A.,2003.Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater.Geophysical Research Letters 30(4),21-22.
Beziat,D.,Dubois,M.,Debat,P.,Nikiema,S.,Salvi,S.,Tollon,F.,2008.Gold metallogeny in the birimian craton of Burkina Faso(West Africa).Journal of African Earth Sciences 50(2-4),215-233.
Bretzler,A.,Lalanne,F.,Nikiema,J.,Podgorski,J., Pfenninger,N.,Berg,M.,Schirmer,M.,2017.Groundwater arsenic contamination in Burkina Faso,West Africa:predicting and verifying regions at risk.Science of the Total Environment 584—585,958-970.https://doi.Org/10.1016/j.scitotenv.2017.01.147.
Buamah,R.,Petrusevski,B.,Schippers,J.C.,2008.Presence of arsenic,iron and manganese in groundwater within the gold-belt zone of Ghana.Journal of Water Supply Research and Technology AQUA 57(7),519-529.
Buschmann,J., Berg,M.,Stengel,C.,Sampson,M.L.,2007.Arsenic and manganese contamination of drinking water resources in Cambodia:coincidence of risk areas with low relief topography.Environmental Science and Technology 41(7),2146-2152.
Castaing,C.,Le Metour,J.,Billa,M.,Donzeau,M.,Chevremont,P.,Egal,E.,Zida,B.,Ouedraogo,I.,Kote,S.,Kabore,B.E.,Ouedraogo,C.,Thieblemont,D.,Guerrot,C.,
Cocherie,A.,Tegyey,M.,Milesi,J.P.,Itard,Y.,2003.Carte geologique et miniere du Burkina Faso a 1/1 000 000.Ouagadougou,Burkina Faso(in French).
Clarke,W.B.,Jenkins,W.J.,Top,Z.,1976.Determination of tritium by mass spectrometric measurement of~3He.The International Journal of Applied Radiation and Isotopes 27(9),515-522.https://doi.org/10.1016/0020-708X(76)90082-X.
Compaore,G.,Lachassagne,P.,Pointet,T.,Travi,Y.,1997.Evaluation du stock d'eau des alterites:Experimentation sur le site granitique de Sanon(Burkina Faso),vol.241.IAHS-AISH Publication,pp.37-46(in French).
Courtois,N.,Lachassagne,P.,Wyns,R.,Blanchin,R.,Bougairé,F.D.,Somé,S.,Tapsoba,A.,2010.Large-scale mapping of hard-rock aquifer properties applied to Burkina Faso.Ground Water 48(2),269-283.
Craig,H.,Lupton,J.E.,1976.Primordial neon,helium,and hydrogen in oceanic basalts.Earth and Planetary Science Letters 31(3),369-385.https://doi.org/10.1016/0012-821X(76)90118-7.
Dansgaard,W.,1964.Stable isotopes in precipitation.Tellus 16(4),436-468.Dixit,S.,Hering,J.G.,2003.Comparison of arsenic(V)and arsenic(Ⅲ)sorption onto iron oxide minerals:implications for arsenic mobility.Environmental Science and Technology 37(18),4182-4189.
Edmunds,W.M.,2009.Palaeoclimate and groundwater evolution in Africa-_implications for adaptation and management Hydrological Sciences Journal54(4),781-792.https://doi.org/10.1623/hysj.54.4.781.
Gerland,P.,Raftery,A.E.,Sevcikova,H.,Li,N.,Gu,D.,Spoorenberg,T.,Alkema,L.,Fosdick,B.K.,Chunn,J.,Lalic,N.,Bay,G.,Buettner,T.,Heilig,G.K.,Wilmoth,J.,2014.World population stabilization unlikely this century.Science 346(6206),234.
Heaton,T.H.E.,1984.Rates and sources of 4He accumulation in groundwater.Hydrological Sciences Journal 29(1),29-47.https://doi.org/10.1080/02626668409490920.
Heaton,T.H.E.,Vogel,J.C.,1981.“Excess air”in groundwater.Journal of Hydrology 50(C),201-216.https://doi.org/10.1016/0022-1694(81)90070-6.
Huneau,F.,Dakoure,D.,Celle-Jeanton,H.,Vitvar,T.,Ito,M.,Traore,S.,Compaore,N.F.,Jirakova,H.,Le Coustumer,P.,2011.Flow pattern and residence time of groundwater within the south-eastern Taoudeni sedimentary basin(Burkina Faso,Mali).Journal of Hydrology 409(1-2),423-439.
Ingram,R.G.S.,Hiscock,K.M.,Dennis,P.F.,2007.Noble gas excess air applied to distinguish groundwater recharge conditions.Environmental Science and Technology 41(6),1949-1955.https://doi.org/10.1021/es061115r.
Jasechko,S.,Taylor,R.G.,2015.Intensive rainfall recharges tropical groundwaters.Environmental Research Letters 10(12),124015.
Kipfer,R.,Aeschbach-Hertig,W.,Peeters,F.,Stute,M.,2002.Noble gases in Lakes and Ground Waters,vol.47.Reviews in Mineralogy and Geochemistry,pp.615-700.
Klump,S.,Kipfer,R.,Cirpka,O.A.,Harvey,C.F.,Brennwald,M.S.,Ashfaque,K.N.,Badruzzaman,A.B.M.,Hug,S.J.,Imboden,D.M.,2006.Groundwater dynamics and arsenic mobilization in Bangladesh assessed using noble gases and tritium.Environmental Science and Technology 40(1),243-250.https://doi.org/10.1021/es051284w.
Koita,M.,Jourde,H.,Koffi,K.J.P.,Da Silveira,K.S.,Biaou,A.,2013.Characterization of weathering profile in granites and volcanosedimentary rocks in West Africa under humid tropical climate conditions.Case of the Dimbokro Catchment(Ivory Coast).Journal of Earth System Science 122(3),841-854.
Kote,S.,Ouedraogo,l.,Donzeau,M.,Le Metour,J.,Castaing,C.,Egal,E.,Thieblemont,D.,Tegyey,M.,Guerrot,C.,Thieblemont,D.,Milesi,J.P.,Billa,M.,Itard,Y.,Ki,.J.C.,2003.Notice explicative de la carte geologique du Burkina Faso a 1/200,000.Feuille Leo:BUMIGEB/BRGM(in French).
Lachassagne,P.,Wyns,R.,Dewandel,B.,2011.The fracture permeability of Hard Rock Aquifers is due neither to tectonics,nor to unloading,but to weathering processes.Terra Nova 23(3),145-161.https://doi.Org/10.1111/j.1365-3121.2011.00998/x.
Lapworth,D.J.,MacDonald,A.M.,Tijani,M.N.,Darling,W.G.,Gooddy,D.C.,Bonsor,H.C.,Araguas-Araguas,L.J.,2013.Residence times of shallow groundwater in West Africa:implications for hydrogeology and resilience to future changes in climate.Hydrogeology Journal 21(3),673-686.https://doi.org/10.1007/S10040-012-0925-4.
Le Mignot,E.,Siebenaller,L.,Beziat,D.,Andre-Mayer,A.S.,Reisberg,L.,Salvi,S.,Velasquez,G.,Zimmermann,C.,Nare, A.,Franceschi,G.,2017.The Paleoproterozoic copper-gold deposits of the Gaoua district,Burkina Faso:superposition of orogenic gold on a porphyry copper occurrence?Economic Geology112(1),99-122.https://doi.org/10.2113/econgeo.112.1.99.
Leduc,C.,Bromley,J.,Schroeter,P.,1997.Water table fluctuation and recharge in semi-arid climate:some results of the HAPEX-Sahel hydrodynamic survey(Niger).Journal of Hydrology 188-189(1-4),123-138.https://doi.org/10.1016/S0022-1694(96)03156-3.
Lezine.A.-M.,Casanova,J.,1989.Pollen and hydrological evidence for the interpretation of past climates in tropical west Africa during the holocene.Quaternary Science Reviews 8(1),45-55.https://doi.org/10.1016/0277-3791(89)90020-6.
Lutz,A.,Thomas,J.M.,Panorska,A.,2011.Environmental controls on stable isotope precipitation values over Mali and Niger,West Africa.Environmental Earth Sciences 62(8),1749-1759.https://doi.org/10.1007/s12665-010-0655-7.
MacDonald,A.M.,Bonsor,H.C.,Dochartaigh,B.b.O.,Taylor,R.G.,2012.Quantitative maps of groundwater resources in Africa.Environmental Research Letters 7(2).https://doi.org/10.1088/1748-9326/7/2/024009.
MacDonald,A.M.,Calow,R.C.,2009.Developing groundwater for secure rural water supplies in Africa.Desalination 248(1-3),546-556.https://doi.org/10.1016/j.desal.2008.05.100.
Maduabuchi,C.,Faye,S.,Maloszewski,P.,2006.Isotope evidence of palaeorecharge and palaeoclimate in the deep confined aquifers of the Chad Basin,NE Nigeria.Science of the Total Environment 370(2-3),467-479.https://doi.org/10.1016/j.scitotenv.2006.08.015.
Mamyrin,BA.,Tolstikhin,I.N.,1984.Helium Isotopes in Nature,vol.3.Elsevier.Martin,N.,Van De Giesen,N.,2005.Spatial distribution of groundwater production and development potential in the Volta River basin of Ghana and Burkina Faso.Water International 30(2),239-249.
McArthur,J.M.,Banerjee,D.M.,Sengupta,S.,Ravenscroft,P.,Klump,S.,Sarkar,A.,Disch,B.,Kipfer,R.,2010.Migration of As,and 3H/3He ages,in groundwater from West Bengal:implications for monitoring.Water Research 44(14),4171-4185.https://doi.Org/10.1016/j.watres.2010.05.010.
Meng,X.,Wang,W.,1998.Arsenic speciation with disposable cartridges.In:Paper Presented at the Third International Conference on Arsenic Exposure and Health Effects,San Diego,California.
Milesi,J.P.,Ledru,P.,Feybesse,J.L,Dommanget,A.,Marcoux,E.,1992,Early proterozoic ore deposits and tectonics of the Birimian orogenic belt,West Africa.Precambrian Research 58(1-4),305-344.
Mitsunobu,S.,Harada,T.,Takahashi,Y.,2006.Comparison of antimony behavior with that of arsenic under various soil redox conditions.Environmental Science and Technology 40(23),7270-7276.https://doi.org/10.1021/es060694x.
Naujokas,M.F.,Anderson,B.,Ahsan,H.,Aposhian,H.V.,Graziano,J.H.,Thompson,C.,Suk,WA., 2013.The broad scope of health effects from chronic arsenic exposure:update on a worldwide public health problem.Environmental Health Perspectives 121(3),295-302.https://doi.org/10.1289/ehp.1205875.
Nikiema,J.,Gl?Ber,W., Krieg,R.,Schirmer,M.,2013.Trace elements and their correlations in hand-dug wells in a laterite environment in a semi-arid region:case study of Tikare,Northern Burkina Faso.Environmental Earth Sciences 69(7),2393-2414.
Ouedraogo,I.,Kote.,S.,Kabore,E.B.,Donzeau,M.,Le Metour,J.,Castaing,C.,Milesi,J.P.,Billa,M.,Zida,B.,2003.Carte geologique du Burkina Faso a 1/200,000.Feuille Léo:BUMIGEB/BRGM(in French).
Rozanski,K.,Araguas-Araguas,L,Gonfiantini,R.,1993.Isotopic Patterns in Modern Global Precipitation.Climate Change in Continental Isotopic Records.American Geophysical Union,pp.1-36.
Rueedi,J., Brennwald,M.S.,Purtschert,R,,Beyerle,U.,Hofer,M.,Kipfer,R.,2005a.Estimating amount and spatial distribution of groundwater recharge in the lullemmeden basin(Niger)based on 3H,3He and CFC-11 measurements.Hydrological Processes 19(17),3285-3298.https://doi.org/10.1002/hyp.5970.
Rueedi,J.,Purtschert,R,,Beyerle,U.,Alberich,C.,Kipfer,R.,2005b.Estimating groundwater mixing ratios and their uncertainties using a statistical multi parameter approach.Journal of Hydrology 305(1-4),1-14.https://doi.org/10.1016/j.jhydrol.2004.06.044.
Sako,A.,Bamba,O.,Gordio,A.,2016.Hydrogeochemical processes controlling groundwater quality around Bomborégold mineralized zone,Central Burkina Faso.Journal of Geochemical Exploration 170,58-71.https://doi.org/10.1016/j.gexplo.2016.08.009.
Smedley,P.L,1996.Arsenic in rural groundwater in Ghana.Journal of African Earth Sciences 22(4),459-470.
Smedley,P.L,Knudsen,J.,Maiga,D.,2007.Arsenic in groundwater from mineralised Proterozoic basement rocks of Burkina Faso.Applied Geochemistry 22(5),1074-1092.
Solomon,D.K.,Hunt,A.,Poreda,R.J.,1996.Source of radiogenic helium 4 in shallow aquifers:implications for dating young groundwater.Water Resources Research32(6),1805-1813.
Some,I.,Sakira,A.,Ouédraogo,M.,Ouedraogo.T,Traoré,A.,Sondo,B.,Guissou,P.,2012.Arsenic levels in tube-wells water,food,residents'urine and the prevalence of skin lesions in Yatenga province,Burkina Faso.Interdisciplinary Toxicology 5(1),38-41.
Soro,D.D.,Koita,M.,Biaou,CA.,Outoumbe,E.,Vouillamoz,J.M.,Yacouba,H.,Gu6rin,R,2017.Geophysical demonstration of the absence of correlation between lineaments and hydrogeologically usefull fractures:case study of the Sanon hard rock aquifer(central northern Burkina Faso).Journal of African Earth Sciences 129,842-852.https://doi.Org/10,1016/j.jafrearscd.2017.02.025.
Stolze,L.,2015.Spatial Variability of Arsenic in Groundwater of the Gold Mining Area of Poura,Burkina Faso(West Africa)(Unpublished Master thesis).Technical University of Denmark(DTU).
Taylor,R.G.,Todd,M.C.,Kongola,L.,Maurice,L.,Nahozya,E.,Sanga,H.,Macdonald,A.M.,2013.Evidence of the dependence of groundwater resources on extreme rainfall in East Africa.Nature Climate Change 3(4),374-378.https://doi.org/10.1038/nclimate1731.
Tolstikhin,I.N.,1984.Chapter 8-helium isotopes in rocks,waters and gases of the Earth's crust.In:M.B.A.,T.I.N.(Eds.),Developments in Geochemistry,vol.3.Elsevier,pp.135-192.
Torgersen,T.,Clarke,W.B.,1985.Helium accumulation in groundwater,I:an evaluation of sources and the continental flux of crustal 4He in the Great Artesian Basin,Australia.Geochimica et Cosmochimica Acta 49(5),1211-1218.
Verplanck,P.L.,Mueller,S.H.,Goldfarb,R.J.,Nordstrom,D.K.,Youcha,E.K.,2008.Geochemical controls of elevated arsenic concentrations in groundwater.Ester Dome,Fairbanks district,Alaska.Chemical Geology 255(1-2),160-172.https://doi.org/10.1016/j.chemgeo.2008.06.020.
WHO,2011.Guidelines for Drinking-water Quality.World Health Organization,Geneva,Switzerland.
Aeschbach-Hertig,W.,Solomon,D.K.,2013.Noble gas Thermometry in Groundwater Hydrology.The Noble Gases as Geochemical Tracers.Springer,pp.81-122.
Ahoule,D.,Lalanne,F.,Mendret,J.,Brosillon,S.,Maiga,A.,2015.Arsenic in African waters:a review.Water Air and Soil Pollution 226(9),1-13.https://doi.org/10.1007/s11270-015-2558-4.
Andrews,J.N.,1985.The isotopic composition of radiogenic helium and its use to study groundwater movement in confined aquifers.Chemical Geology 49(1-3),339—351.
Argos,M.,Kalra,T.,Rathouz,P.J.,Chen,Y., Pierce,B.,Parvez,F.,Islam,T.,Ahmed,A.,Rakibuz-Zaman,M.,Hasan,R.,Sarwar,G.,Slavkovich,V.,Van Geen,A.,
Graziano,J.,Ahsan,H.,2010.Arsenic exposure from drinking water,and allcause and chronic-disease mortalities in Bangladesh(HEALS):a prospective cohort study.The Lancet 376(9737),252-258.
Asante,K.A.,Agusa,T.,Subramanian,A.,Ansa-Asare,O.D.,Biney,C.A.,Tanabe,S.,2007.Contamination status of arsenic and other trace elements in drinking water and residents from Tarkwa,a historic mining township in Ghana.Chemosphere 66(8),1513-1522.
Bamba,0.,1996.L'or dissemine dans les albitites birimiennes de Larafella(Burkina Faso)et son evolution dans les alterites et les cuirasses ferrugineuses métallogenie-petrologie-geomorphologie.Universite Aix-MarseilleⅢ(in French).
Bamba,O.,Parisot,J.C.,Grandin,G.,Beauvais,A.,2002.Ferricrete genesis and supergene gold behaviour in Burkina Faso,West Africa.Geochemistry Exploration Environment Analysis 2(1),3-14.https://doi.org/10.1144/1467-787302-001.
Barbier,B.,Dembele,Y.,Compaore,L,2006.L'eau au Burkina Faso:usages actuels et perspectives.Sud Sciences et Technologies 14,20-29.
Barro-Traore,F.,Tiendrebeogo,S.R.M.,Lallogo,S., Tiendrebeogo,S.,Dabal,M.,Ouedraogo,H.,2008.Manifestations cutanees de l'arcenicisme au Burkina Faso:aspects epidemiologiques et cliniques.Mali Medical Tome XXIII(1)(in French).
Berg,M.,Trang,P.T.K.,Stengel,C., Buschmann,J.,Viet,P.H.,Van Dan,N.,Giger,W.,Stiiben,D.,2008.Hydrological and sedimentary controls leading to arsenic contamination of groundwater in the Hanoi area,Vietnam:the impact of ironarsenic ratios,peat,river bank deposits,and excessive groundwater abstraction.
Chemical Geology 249(1-2),91-112.https://doi.org/10.1016/j.xhemgeo.2007.12.007.
Beyerle,U.,Aeschbach-Hertig,W.,Hofer,M.,Imboden,D.M.,Baur,H.,Kipfer,R.,1999.Infiltration of river water to a shallow aquifer investigated with H-3/He-3,noble gases and CFCs.Journal of Hydrology 220(3-4),169-185.https://doi.org/10.1016/S0022-1694(99)00069-4.
Beyerle,U.,Aeschbach-Hertig,W.,Imboden,D.M.,Baur,H.,Graf,T.,Kipfer,R.,2000.A mass spectrometric system for the analysis of noble gases and tritium from water samples.Environmental Science and Technology 34(10),2042-2050.https://doi.org/10.1021/es990840h.
Beyerle,U.,Rueedi,J.,Leuenberger,M.,Aeschbach-Hertig,W.,Peeters,F.,Kipfer,R.,Dodo,A.,2003.Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater.Geophysical Research Letters 30(4),21-22.
Beziat,D.,Dubois,M.,Debat,P.,Nikiema,S.,Salvi,S.,Tollon,F.,2008.Gold metallogeny in the birimian craton of Burkina Faso(West Africa).Journal of African Earth Sciences 50(2-4),215-233.
Bretzler,A.,Lalanne,F.,Nikiema,J.,Podgorski,J., Pfenninger,N.,Berg,M.,Schirmer,M.,2017.Groundwater arsenic contamination in Burkina Faso,West Africa:predicting and verifying regions at risk.Science of the Total Environment 584—585,958-970.https://doi.Org/10.1016/j.scitotenv.2017.01.147.
Buamah,R.,Petrusevski,B.,Schippers,J.C.,2008.Presence of arsenic,iron and manganese in groundwater within the gold-belt zone of Ghana.Journal of Water Supply Research and Technology AQUA 57(7),519-529.
Buschmann,J., Berg,M.,Stengel,C.,Sampson,M.L.,2007.Arsenic and manganese contamination of drinking water resources in Cambodia:coincidence of risk areas with low relief topography.Environmental Science and Technology 41(7),2146-2152.
Castaing,C.,Le Metour,J.,Billa,M.,Donzeau,M.,Chevremont,P.,Egal,E.,Zida,B.,Ouedraogo,I.,Kote,S.,Kabore,B.E.,Ouedraogo,C.,Thieblemont,D.,Guerrot,C.,
Cocherie,A.,Tegyey,M.,Milesi,J.P.,Itard,Y.,2003.Carte geologique et miniere du Burkina Faso a 1/1 000 000.Ouagadougou,Burkina Faso(in French).
Clarke,W.B.,Jenkins,W.J.,Top,Z.,1976.Determination of tritium by mass spectrometric measurement of~3He.The International Journal of Applied Radiation and Isotopes 27(9),515-522.https://doi.org/10.1016/0020-708X(76)90082-X.
Compaore,G.,Lachassagne,P.,Pointet,T.,Travi,Y.,1997.Evaluation du stock d'eau des alterites:Experimentation sur le site granitique de Sanon(Burkina Faso),vol.241.IAHS-AISH Publication,pp.37-46(in French).
Courtois,N.,Lachassagne,P.,Wyns,R.,Blanchin,R.,Bougairé,F.D.,Somé,S.,Tapsoba,A.,2010.Large-scale mapping of hard-rock aquifer properties applied to Burkina Faso.Ground Water 48(2),269-283.
Craig,H.,Lupton,J.E.,1976.Primordial neon,helium,and hydrogen in oceanic basalts.Earth and Planetary Science Letters 31(3),369-385.https://doi.org/10.1016/0012-821X(76)90118-7.
Dansgaard,W.,1964.Stable isotopes in precipitation.Tellus 16(4),436-468.Dixit,S.,Hering,J.G.,2003.Comparison of arsenic(V)and arsenic(Ⅲ)sorption onto iron oxide minerals:implications for arsenic mobility.Environmental Science and Technology 37(18),4182-4189.
Edmunds,W.M.,2009.Palaeoclimate and groundwater evolution in Africa-_implications for adaptation and management Hydrological Sciences Journal54(4),781-792.https://doi.org/10.1623/hysj.54.4.781.
Gerland,P.,Raftery,A.E.,Sevcikova,H.,Li,N.,Gu,D.,Spoorenberg,T.,Alkema,L.,Fosdick,B.K.,Chunn,J.,Lalic,N.,Bay,G.,Buettner,T.,Heilig,G.K.,Wilmoth,J.,2014.World population stabilization unlikely this century.Science 346(6206),234.
Heaton,T.H.E.,1984.Rates and sources of 4He accumulation in groundwater.Hydrological Sciences Journal 29(1),29-47.https://doi.org/10.1080/02626668409490920.
Heaton,T.H.E.,Vogel,J.C.,1981.“Excess air”in groundwater.Journal of Hydrology 50(C),201-216.https://doi.org/10.1016/0022-1694(81)90070-6.
Huneau,F.,Dakoure,D.,Celle-Jeanton,H.,Vitvar,T.,Ito,M.,Traore,S.,Compaore,N.F.,Jirakova,H.,Le Coustumer,P.,2011.Flow pattern and residence time of groundwater within the south-eastern Taoudeni sedimentary basin(Burkina Faso,Mali).Journal of Hydrology 409(1-2),423-439.
Ingram,R.G.S.,Hiscock,K.M.,Dennis,P.F.,2007.Noble gas excess air applied to distinguish groundwater recharge conditions.Environmental Science and Technology 41(6),1949-1955.https://doi.org/10.1021/es061115r.
Jasechko,S.,Taylor,R.G.,2015.Intensive rainfall recharges tropical groundwaters.Environmental Research Letters 10(12),124015.
Kipfer,R.,Aeschbach-Hertig,W.,Peeters,F.,Stute,M.,2002.Noble gases in Lakes and Ground Waters,vol.47.Reviews in Mineralogy and Geochemistry,pp.615-700.
Klump,S.,Kipfer,R.,Cirpka,O.A.,Harvey,C.F.,Brennwald,M.S.,Ashfaque,K.N.,Badruzzaman,A.B.M.,Hug,S.J.,Imboden,D.M.,2006.Groundwater dynamics and arsenic mobilization in Bangladesh assessed using noble gases and tritium.Environmental Science and Technology 40(1),243-250.https://doi.org/10.1021/es051284w.
Koita,M.,Jourde,H.,Koffi,K.J.P.,Da Silveira,K.S.,Biaou,A.,2013.Characterization of weathering profile in granites and volcanosedimentary rocks in West Africa under humid tropical climate conditions.Case of the Dimbokro Catchment(Ivory Coast).Journal of Earth System Science 122(3),841-854.
Kote,S.,Ouedraogo,l.,Donzeau,M.,Le Metour,J.,Castaing,C.,Egal,E.,Thieblemont,D.,Tegyey,M.,Guerrot,C.,Thieblemont,D.,Milesi,J.P.,Billa,M.,Itard,Y.,Ki,.J.C.,2003.Notice explicative de la carte geologique du Burkina Faso a 1/200,000.Feuille Leo:BUMIGEB/BRGM(in French).
Lachassagne,P.,Wyns,R.,Dewandel,B.,2011.The fracture permeability of Hard Rock Aquifers is due neither to tectonics,nor to unloading,but to weathering processes.Terra Nova 23(3),145-161.https://doi.Org/10.1111/j.1365-3121.2011.00998/x.
Lapworth,D.J.,MacDonald,A.M.,Tijani,M.N.,Darling,W.G.,Gooddy,D.C.,Bonsor,H.C.,Araguas-Araguas,L.J.,2013.Residence times of shallow groundwater in West Africa:implications for hydrogeology and resilience to future changes in climate.Hydrogeology Journal 21(3),673-686.https://doi.org/10.1007/S10040-012-0925-4.
Le Mignot,E.,Siebenaller,L.,Beziat,D.,Andre-Mayer,A.S.,Reisberg,L.,Salvi,S.,Velasquez,G.,Zimmermann,C.,Nare, A.,Franceschi,G.,2017.The Paleoproterozoic copper-gold deposits of the Gaoua district,Burkina Faso:superposition of orogenic gold on a porphyry copper occurrence?Economic Geology112(1),99-122.https://doi.org/10.2113/econgeo.112.1.99.
Leduc,C.,Bromley,J.,Schroeter,P.,1997.Water table fluctuation and recharge in semi-arid climate:some results of the HAPEX-Sahel hydrodynamic survey(Niger).Journal of Hydrology 188-189(1-4),123-138.https://doi.org/10.1016/S0022-1694(96)03156-3.
Lezine.A.-M.,Casanova,J.,1989.Pollen and hydrological evidence for the interpretation of past climates in tropical west Africa during the holocene.Quaternary Science Reviews 8(1),45-55.https://doi.org/10.1016/0277-3791(89)90020-6.
Lutz,A.,Thomas,J.M.,Panorska,A.,2011.Environmental controls on stable isotope precipitation values over Mali and Niger,West Africa.Environmental Earth Sciences 62(8),1749-1759.https://doi.org/10.1007/s12665-010-0655-7.
MacDonald,A.M.,Bonsor,H.C.,Dochartaigh,B.b.O.,Taylor,R.G.,2012.Quantitative maps of groundwater resources in Africa.Environmental Research Letters 7(2).https://doi.org/10.1088/1748-9326/7/2/024009.
MacDonald,A.M.,Calow,R.C.,2009.Developing groundwater for secure rural water supplies in Africa.Desalination 248(1-3),546-556.https://doi.org/10.1016/j.desal.2008.05.100.
Maduabuchi,C.,Faye,S.,Maloszewski,P.,2006.Isotope evidence of palaeorecharge and palaeoclimate in the deep confined aquifers of the Chad Basin,NE Nigeria.Science of the Total Environment 370(2-3),467-479.https://doi.org/10.1016/j.scitotenv.2006.08.015.
Mamyrin,BA.,Tolstikhin,I.N.,1984.Helium Isotopes in Nature,vol.3.Elsevier.Martin,N.,Van De Giesen,N.,2005.Spatial distribution of groundwater production and development potential in the Volta River basin of Ghana and Burkina Faso.Water International 30(2),239-249.
McArthur,J.M.,Banerjee,D.M.,Sengupta,S.,Ravenscroft,P.,Klump,S.,Sarkar,A.,Disch,B.,Kipfer,R.,2010.Migration of As,and 3H/3He ages,in groundwater from West Bengal:implications for monitoring.Water Research 44(14),4171-4185.https://doi.Org/10.1016/j.watres.2010.05.010.
Meng,X.,Wang,W.,1998.Arsenic speciation with disposable cartridges.In:Paper Presented at the Third International Conference on Arsenic Exposure and Health Effects,San Diego,California.
Milesi,J.P.,Ledru,P.,Feybesse,J.L,Dommanget,A.,Marcoux,E.,1992,Early proterozoic ore deposits and tectonics of the Birimian orogenic belt,West Africa.Precambrian Research 58(1-4),305-344.
Mitsunobu,S.,Harada,T.,Takahashi,Y.,2006.Comparison of antimony behavior with that of arsenic under various soil redox conditions.Environmental Science and Technology 40(23),7270-7276.https://doi.org/10.1021/es060694x.
Naujokas,M.F.,Anderson,B.,Ahsan,H.,Aposhian,H.V.,Graziano,J.H.,Thompson,C.,Suk,WA., 2013.The broad scope of health effects from chronic arsenic exposure:update on a worldwide public health problem.Environmental Health Perspectives 121(3),295-302.https://doi.org/10.1289/ehp.1205875.
Nikiema,J.,Gl?Ber,W., Krieg,R.,Schirmer,M.,2013.Trace elements and their correlations in hand-dug wells in a laterite environment in a semi-arid region:case study of Tikare,Northern Burkina Faso.Environmental Earth Sciences 69(7),2393-2414.
Ouedraogo,I.,Kote.,S.,Kabore,E.B.,Donzeau,M.,Le Metour,J.,Castaing,C.,Milesi,J.P.,Billa,M.,Zida,B.,2003.Carte geologique du Burkina Faso a 1/200,000.Feuille Léo:BUMIGEB/BRGM(in French).
Rozanski,K.,Araguas-Araguas,L,Gonfiantini,R.,1993.Isotopic Patterns in Modern Global Precipitation.Climate Change in Continental Isotopic Records.American Geophysical Union,pp.1-36.
Rueedi,J., Brennwald,M.S.,Purtschert,R,,Beyerle,U.,Hofer,M.,Kipfer,R.,2005a.Estimating amount and spatial distribution of groundwater recharge in the lullemmeden basin(Niger)based on 3H,3He and CFC-11 measurements.Hydrological Processes 19(17),3285-3298.https://doi.org/10.1002/hyp.5970.
Rueedi,J.,Purtschert,R,,Beyerle,U.,Alberich,C.,Kipfer,R.,2005b.Estimating groundwater mixing ratios and their uncertainties using a statistical multi parameter approach.Journal of Hydrology 305(1-4),1-14.https://doi.org/10.1016/j.jhydrol.2004.06.044.
Sako,A.,Bamba,O.,Gordio,A.,2016.Hydrogeochemical processes controlling groundwater quality around Bomborégold mineralized zone,Central Burkina Faso.Journal of Geochemical Exploration 170,58-71.https://doi.org/10.1016/j.gexplo.2016.08.009.
Smedley,P.L,1996.Arsenic in rural groundwater in Ghana.Journal of African Earth Sciences 22(4),459-470.
Smedley,P.L,Knudsen,J.,Maiga,D.,2007.Arsenic in groundwater from mineralised Proterozoic basement rocks of Burkina Faso.Applied Geochemistry 22(5),1074-1092.
Solomon,D.K.,Hunt,A.,Poreda,R.J.,1996.Source of radiogenic helium 4 in shallow aquifers:implications for dating young groundwater.Water Resources Research32(6),1805-1813.
Some,I.,Sakira,A.,Ouédraogo,M.,Ouedraogo.T,Traoré,A.,Sondo,B.,Guissou,P.,2012.Arsenic levels in tube-wells water,food,residents'urine and the prevalence of skin lesions in Yatenga province,Burkina Faso.Interdisciplinary Toxicology 5(1),38-41.
Soro,D.D.,Koita,M.,Biaou,CA.,Outoumbe,E.,Vouillamoz,J.M.,Yacouba,H.,Gu6rin,R,2017.Geophysical demonstration of the absence of correlation between lineaments and hydrogeologically usefull fractures:case study of the Sanon hard rock aquifer(central northern Burkina Faso).Journal of African Earth Sciences 129,842-852.https://doi.Org/10,1016/j.jafrearscd.2017.02.025.
Stolze,L.,2015.Spatial Variability of Arsenic in Groundwater of the Gold Mining Area of Poura,Burkina Faso(West Africa)(Unpublished Master thesis).Technical University of Denmark(DTU).
Taylor,R.G.,Todd,M.C.,Kongola,L.,Maurice,L.,Nahozya,E.,Sanga,H.,Macdonald,A.M.,2013.Evidence of the dependence of groundwater resources on extreme rainfall in East Africa.Nature Climate Change 3(4),374-378.https://doi.org/10.1038/nclimate1731.
Tolstikhin,I.N.,1984.Chapter 8-helium isotopes in rocks,waters and gases of the Earth's crust.In:M.B.A.,T.I.N.(Eds.),Developments in Geochemistry,vol.3.Elsevier,pp.135-192.
Torgersen,T.,Clarke,W.B.,1985.Helium accumulation in groundwater,I:an evaluation of sources and the continental flux of crustal 4He in the Great Artesian Basin,Australia.Geochimica et Cosmochimica Acta 49(5),1211-1218.
Verplanck,P.L.,Mueller,S.H.,Goldfarb,R.J.,Nordstrom,D.K.,Youcha,E.K.,2008.Geochemical controls of elevated arsenic concentrations in groundwater.Ester Dome,Fairbanks district,Alaska.Chemical Geology 255(1-2),160-172.https://doi.org/10.1016/j.chemgeo.2008.06.020.
WHO,2011.Guidelines for Drinking-water Quality.World Health Organization,Geneva,Switzerland.