Arsenic in a fractured slate aquifer system, New England, USA: Influence of bedrock geochemistry, groundwater flow paths, redox and ion exchange

Arsenic in a fractured slate aquifer system, New England, USA: Influence of bedrock geochemistry, groundwater flow paths, redox and ion exchange

•Arsenic is elevated above 10ppb in 22% (52/236) of bedrock wells in a fractured slate aquifer system.•As concentrations in pyrites occurring in black and dark gray slates range from 200 to 2000mg/kg.•As release occurs via dissolution of As-rich pyrite under oxidizing to mildly reducing conditions.•...

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Veröffentlicht in:Applied geochemistry 2013-12, Vol.39, p.181-192
Hauptverfasser: Ryan, Peter C., Kim, Jonathan J., Mango, Helen, Hattori, Keiko, Thompson, Ali
Format: Artikel
Sprache:eng
Schlagworte:
aquifers
arsenic
bedrock
continental shelf
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
ferrihydrite
Geochemistry
groundwater
groundwater flow
groundwater recharge
ion exchange
iron
metamorphic rocks
Pollution, environment geology
pyrites
sedimentary rocks
sodium
surveys
topography
wells
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Zusammenfassung:•Arsenic is elevated above 10ppb in 22% (52/236) of bedrock wells in a fractured slate aquifer system.•As concentrations in pyrites occurring in black and dark gray slates range from 200 to 2000mg/kg.•As release occurs via dissolution of As-rich pyrite under oxidizing to mildly reducing conditions.•As sorbs to Fe-hydroxides at pH7.•All wells with >50ppb As occur in low topographic positions with low yields, high pH (>7) and ∼low Eh (10ppb As and none contain >25ppb. Overall, 28% (50/176) of low-elevation wells (
ISSN:0883-2927
1872-9134
DOI:10.1016/j.apgeochem.2013.09.010