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Seasonal variation of arsenic concentration in wells in Nevada.

Authors
Thundiyil-JG; Yuan-Y; Smith-AH; Steinmaus-C
Source
Environ Res 2007 Jul; 104(3):367-373
NIOSHTIC No.
20037247
Abstract
The issue of seasonal arsenic measurement variability poses consequences regarding the interpretation and frequency of well water measurements for both public health research and surveillance. In this study, we evaluated seasonal variability in arsenic concentration in 356 wells in western Nevada. River flow data obtained from US Geological Survey National Water Information System were used to classify seasons as wet or dry, and mean differences in arsenic well concentrations measured during these seasons were compared. Arsenic concentrations in these wells averaged 72.9 microg/L (range, non-detect to 3000 microg/L). The mean difference in arsenic concentrations between the wet and dry seasons was -3.3 microg/L (p = 0.78; average percent difference = 2.3%). Eighty wells (22%) had higher arsenic concentrations in the wet season, 75 wells (21%) had higher arsenic concentrations in the dry season and no difference was seen in 201 wells (56%). The mean differences in wells with arsenic levels of 0-10, 11-50, 51-200, > 200 microg/L were -1.4 microg/L(p=0.43), 9.2 microg/L(p=0.36), 15.1 microg/L(p=0.30), and -49.9 microg/L(p=0.59). In summary, although changes in arsenic concentrations were seen in some wells, clear trends in arsenic concentration over time were not associated with the wet and dry seasons. These findings provide evidence that, in our study area as a whole, little seasonal variability occurs in arsenic concentrations, and repeated assessments of arsenic concentrations based on season might add little value to the accuracy of health effects research or public health surveillance.
Keywords
Biological-effects; Chemical-deposition; Chemical-hypersensitivity; Chemical-properties; Demographic-characteristics; Exposure-assessment; Exposure-levels; Exposure-methods; Health-hazards; Organic-chemicals; Physiological-effects; Physiological-measurements; Physiological-response; Poisons; Pollution; Public-health; Qualitative-analysis; Risk-analysis; Risk-factors; Seasonal-activity; Seasonal-factors; Statistical-analysis; Water-analysis; Author Keywords: Arsenic; Well water; Seasonal variability; River flow; Nevada
Contact
Josef G. Thundiyil, School of Medicine, University of California, San Francisco, UCSF box 1369, San Francisco, CA 94143-1369
CODEN
ENVRAL
CAS No.
7440-38-2
Publication Date
20070701
Document Type
Journal Article
Email Address
joseft@mindspring.com
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008429
Issue of Publication
3
ISSN
0013-9351
Source Name
Environmental Research
State
CA; FL; NV
Performing Organization
University of California, Berkeley
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