NDLI: Distribution and seasonal dynamics of arsenic in a shallow lake in northwestern New Jersey, USA

Content Provider	Springer Nature Link
Author	Barringer, Julia L. Szabo, Zoltan Wilson, Timothy P. Bonin, Jennifer L. Kratzer, Todd Cen, Kimberly Romagna, Terri Alebus, Marzooq Hirst, Barbara
Copyright Year	2010
Abstract	Elevated concentrations of arsenic (As) occurred during warm months in water from the outlet of Lake Mohawk in northwestern New Jersey. The shallow manmade lake is surrounded by residential development and used for recreation. Eutrophic conditions are addressed by alum and copper sulfate applications and aerators operating in the summer. In September 2005, arsenite was dominant in hypoxic to anoxic bottom water. Filterable As concentrations were about 1.6–2 times higher than those in the upper water column (23–25 μg/L, mostly arsenate). Hypoxic/anoxic and near-neutral bottom conditions formed during the summer, but became more oxic and alkaline as winter approached. Acid-leachable As concentrations in lake-bed sediments ranged up to 694 mg/kg in highly organic material from the tops of sediment cores but were <15 mg/kg in geologic substrate. During warm months, reduced As from the sediment diffuses into the water column and is oxidized; mixing by aerators, wind, and boat traffic spreads arsenate and metals, some in particulate form, throughout the water column. Similar levels of As in sediments of lakes treated with arsenic pesticides indicate that most of the As in Lake Mohawk probably derives from past use of arsenical pesticides, although records of applications are lacking. The annual loss of As at the lake outlet is only about 0.01% of the As calculated to be in the sediments, indicating that elevated levels of As in the lake will persist for decades.
Starting Page	1
Ending Page	22
Page Count	22
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	33
Issue Number	1
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic Lake water Lake sediments Redox Metals Public Health/Gesundheitswesen Soil Science & Conservation Geochemistry Environmental Chemistry Terrestrial Pollution Environmental Health
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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