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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Olson, Scott A. Hinkle, Stephen R. Belaval, Marcel Flanagan, Sarah M. Ayotte, Joseph D. Burow, Karen R. Lindsey, Bruce D. |
| Spatial Coverage | United States |
| Description | Author Affiliation: Ayotte JD ( U.S. Geological Survey, 331 Commerce Way, Pembroke, NH 03275, USA. Electronic address: jayotte@usgs.gov.); Belaval M ( U.S. Environmental Protection Agency, Boston, MA, USA.); Olson SA ( U.S. Geological Survey, 331 Commerce Way, Pembroke, NH 03275, USA.); Burow KR ( U.S. Geological Survey, Sacramento, CA, USA.); Flanagan SM ( U.S. Geological Survey, 331 Commerce Way, Pembroke, NH 03275, USA.); Hinkle SR ( U.S. Geological Survey, Portland, OR, USA.); Lindsey BD ( U.S. Geological Survey, New Cumberland, PA, USA.) |
| Abstract | The occurrence of arsenic in groundwater is a recognized environmental hazard with worldwide importance and much effort has been focused on surveying and predicting where arsenic occurs. Temporal variability is one aspect of this environmental hazard that has until recently received less attention than other aspects. For this study, we analyzed 1245 wells with two samples per well. We suggest that temporal variability, often reported as affecting very few wells, is perhaps a larger issue than it appears and has been overshadowed by datasets with large numbers of non-detect data. Although there was only a slight difference in arsenic concentration variability among samples from public and private wells (p=0.0452), the range of variability was larger for public than for private wells. Further, we relate the variability we see to geochemical factors-primarily variability in redox-but also variability in major-ion chemistry. We also show that in New England there is a weak but statistically significant indication that seasonality may have an effect on concentrations, whereby concentrations in the first two quarters of the year (January-June) are significantly lower than in the second two quarters (July-December) (p<0.0001). In the Central Valley of California, the relation of arsenic concentration to season was not statistically significant (p=0.4169). In New England, these changes appear to follow groundwater levels. It is possible that this difference in arsenic concentrations is related to groundwater level changes, pumping stresses, evapotranspiration effects, or perhaps mixing of more oxidizing, lower pH recharge water in wetter months. Focusing on the understanding the geochemical conditions in aquifers where arsenic concentrations are concerns and causes of geochemical changes in the groundwater environment may lead to a better understanding of where and by how much arsenic will vary over time. |
| ISSN | 00489697 |
| Volume Number | 505 |
| e-ISSN | 18791026 |
| Journal | Science of The Total Environment |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-02-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Arsenic Analysis Environmental Monitoring Water Pollutants, Chemical Water Supply Statistics & Numerical Data Drinking Water Groundwater Chemistry United States Water Pollution, Chemical Water Wells Journal Article Research Support, U.s. Gov't, Non-p.h.s. Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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