沉积物中的得克隆在中华圆田螺体内的积累及氧化应激效应
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摘要
得克隆(Dechloraneplus,简称DP)是一种典型的氯代阻燃剂,在多种环境介质中均有检测到。因其极高的疏水性,水体环境中的DP主要积聚在沉积物中,并通过底栖生物进入食物链。研究了沉积物中的DP在低等底栖生物中华圆田螺体内的积累和毒性效应,结果表明:无论低浓度组还是高浓度组,顺式-DP和反式-DP的积累量都随暴露时间的增加而增加,但32 d暴露结束后积累并未达到平衡,计算最大生物-底泥积累因子(Bio-sediment accumulation factor,BSAF)分别为0.82和0.40,f_(syn)先增大后减小,说明顺式-DP比反式-DP更易吸附在沉积物中,但生物积累性不明显。田螺体内氧化氢酶(Catalase,CAT)和丙二醛(Malondialdehyde,MDA)随时间增加先变大后变小,说明低浓度DP会导致机体产生抗氧化性,高浓度DP会对机体组织产生氧化损伤。
Dechlorane plus(DP) is a typical chlorinated flame retardant and is detectable in various media of environment. Due to its extremely high hydrophobicity, DP in water environment is mainly accumulated in sediments and could enters the food chain through benthonic organisms. In this experiment, the accumulation capacity and toxicity of DP in Cipangopaludinacahayensis were studied. The results showed that concentrations of both syn-DP and anti-DP increased with an increase of exposure time. However, no accumulation equilibrium was achieved at the end of 32-day exposure. In addition, the calculated maximum bio-sediment accumulation factors were 0.82 and 0.40 for syn-DP and anti-DP, respectively. The value of f_(syn) wasfirst increased and then decreased, indicating that syn-DP was more easily absorbed in sediment than anti-DP but with no obvious bioaccumulation.Concentrations of catalase(CAT) and malondialdehyde(MDA) in the Cipangopaludina chinensis increased first and then decreased with increasing exposure time, indicating that low levels of DP resulted in anti-oxidation while DP with highconcentration caused oxidative damage.
Dechlorane plus(DP) is a typical chlorinated flame retardant and is detectable in various media of environment. Due to its extremely high hydrophobicity, DP in water environment is mainly accumulated in sediments and could enters the food chain through benthonic organisms. In this experiment, the accumulation capacity and toxicity of DP in Cipangopaludinacahayensis were studied. The results showed that concentrations of both syn-DP and anti-DP increased with an increase of exposure time. However, no accumulation equilibrium was achieved at the end of 32-day exposure. In addition, the calculated maximum bio-sediment accumulation factors were 0.82 and 0.40 for syn-DP and anti-DP, respectively. The value of f_(syn) wasfirst increased and then decreased, indicating that syn-DP was more easily absorbed in sediment than anti-DP but with no obvious bioaccumulation.Concentrations of catalase(CAT) and malondialdehyde(MDA) in the Cipangopaludina chinensis increased first and then decreased with increasing exposure time, indicating that low levels of DP resulted in anti-oxidation while DP with highconcentration caused oxidative damage.
引文
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[3]SVERKO E,TOMY G T,REINER E J,et al.Dechloraneplus and related compounds in the environment:a review[J].Environmental science&technology,2011,45(12):5088-5098.
[4]QIU X,MARVIN C H,HITES R A.Dechlorane plus and other flame retardants in a sediment core from lake Ontario[J].Environmental science&technology,2007,41(17):6014-6019.
[5]WANG D G,YANG M,QI H,et al.An Asia-Specific source of dechlorane plus:concentration,isomer profiles,and other related compounds[J].Environmental science&technology,2010,44(17):6608-6613.
[6]ZHANG L,JI F,LI M,et al.Short-term effects of dechlorane plus on the earthworm Eiseniafetida,determined by a systems biology approach[J].Journal of hazardous materials,2014,273(6):239-246.
[7]SVERKO E,TOMY G T,MARVIN C H,et al.Dechlorane plus levels in sediment of the lower great lakes[J].Environmental science&technology,2008,42(2):361-366.
[8]SUN Y X,ZHANG Z W,XU X R,et al.Spatial and vertical distribution of dechlorane plus in mangrove sediments of thepearl river estuary,south China[J].Archives of environmental contamination&toxicology,2016,71(3):1-6.
[9]JIA H,SUN Y,LIU X,et al.Concentration and bioaccumulation of dechlorane compounds in coastal environment of northern China[J].Environmental science&technology,2011,45(7):2613-2618.
[10]QI H,LIU L,JIA H,et al.Dechloraneplus in surficial water and sediment in a northeastern Chinese river[J].Environmental science&technology,2010,44(7):2305-2308.
[11]MA W L,LIU L Y,QI H,et al.Dechlorane plus in multimedia in northeastern Chinese urban region[J].Environment international,2011,37(1):66-70.
[12]WU J P,ZHANG Y,LUO X J,et al.Isomer-specific bioaccumulation and trophic transfer of dechlorane plus in the freshwater food web from a highly contaminated site,south China[J].Environmental science&technology,2009,44(2):606-611.
[13]YU Z,LUS,GAOS,et al.Levels and isomer profiles ofdechlorane plus in the surface soils from e-waste recycling areas and industrial areas in south China[J].Environmental pollution,2010,158(9):2920-2925.
[14]周珊珊,应圣达,付杰,等.底泥得克隆污染在斑马鱼胚胎上的积累效应[J].浙江工业大学学报,2017,44(2):201-205.
[15]LI S,REINEREJ,KOLIC T M,et al.Identification and screening analysis of halogenated norbornene flame retardants in the Laurentian great lakes:dechloranes 602,603and 604[J].Environmental science&technology,2010,44(2):760-766.
[16]TOMY G T,THOMAS C R,ZIDANE T M,et al.Examination of isomer specific bioaccumulation parameters and potential in vivo hepatic metabolites of syn-and anti-dechlorane plus isomers in juvenile rainbow trout(Oncorhynchusmykiss)[J].Environmental science&technology,2008,42(15):5562-5567.
[17]ZHOU S S,FU J,HE H,ET A L.Spatial distribution and implications to sources of halogenated flame retardants in riverine sediments of Taizhou,an intense e-waste recycling area in eastern China[J].Chemosphere,2017,184:1202-1208.
[18]李亦玮.得克隆在鱼体内生物富集效应的研究[D].大连:大连海事大学,2016.
[19]YANG Y,JI F,CUI Y,et al.Ecotoxicological effects of earthworm following long-term dechlorane plus exposure[J].Chemosphere,2015,144:2476-2481.