Arsenic Occurrence in New Hampshire Drinking Water
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- 作者：Stephen C. Peters ; Joel D. Blum ; Bjoern Klaue ; and Margaret R. Karagas
- 刊名：Environmental Science & Technology
- 出版年：1999
- 出版时间：May 1, 1999
- 年：1999
- 卷：33
- 期：9
- 页码：1328 - 1333
- 全文大小：113K
- 年卷期：v.33,no.9(May 1, 1999)
- ISSN：1520-5851
文摘
Arsenic concentrations were measured in 992 drinkingwater samples collected from New Hampshire householdsusing online hydride generation ICP-MS. These randomlyselected household water samples contain much less arsenicthan those voluntarily submitted for analysis to the NewHampshire Department of Environmental Services (NHDES).Extrapolation of the voluntarily submitted sample set toall New Hampshire residents significantly overestimatesarsenic exposure. In randomly selected households,concentrations ranged from <0.0003 to 180 
g/L, withwater from domestic wells containing significantly morearsenic than water from municipal sources. Water samplesfrom drilled bedrock wells had the highest arsenicconcentrations, while samples from surficial wells hadthe lowest arsenic concentrations. We suggest that muchof the groundwater arsenic in New Hampshire is derivedfrom weathering of bedrock materials and not fromanthropogenic contamination. The spatial distribution ofelevated arsenic concentrations (>50 g/L) correlates withLate-Devonian Concord-type granitic bedrock. Fieldobservations in the region exhibiting the highest groundwaterarsenic concentrations revealed abundant pegmatitedikes associated with nearby granites. Analysis of rockdigests indicates arsenic concentrations up to 60 mg/kg inpegmatites, with much lower values in surroundingschists and granites. Weak acid leaches show thatapproximately half of the total arsenic in the pegmatitesis labile and therefore can be mobilized during rock-waterinteraction.
g/L, withwater from domestic wells containing significantly morearsenic than water from municipal sources. Water samplesfrom drilled bedrock wells had the highest arsenicconcentrations, while samples from surficial wells hadthe lowest arsenic concentrations. We suggest that muchof the groundwater arsenic in New Hampshire is derivedfrom weathering of bedrock materials and not fromanthropogenic contamination. The spatial distribution ofelevated arsenic concentrations (>50 g/L) correlates withLate-Devonian Concord-type granitic bedrock. Fieldobservations in the region exhibiting the highest groundwaterarsenic concentrations revealed abundant pegmatitedikes associated with nearby granites. Analysis of rockdigests indicates arsenic concentrations up to 60 mg/kg inpegmatites, with much lower values in surroundingschists and granites. Weak acid leaches show thatapproximately half of the total arsenic in the pegmatitesis labile and therefore can be mobilized during rock-waterinteraction.