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Predicting arsenic concentrations in groundwater of San Luis Valley, Colorado: implications for individual-level lifetime exposure assessment

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Abstract

Consumption of inorganic arsenic in drinking water at high levels has been associated with chronic diseases. Risk is less clear at lower levels of arsenic, in part due to difficulties in estimating exposure. Herein we characterize spatial and temporal variability of arsenic concentrations and develop models for predicting aquifer arsenic concentrations in the San Luis Valley, Colorado, an area of moderately elevated arsenic in groundwater. This study included historical water samples with total arsenic concentrations from 595 unique well locations. A longitudinal analysis established temporal stability in arsenic levels in individual wells. The mean arsenic levels for a random sample of 535 wells were incorporated into five kriging models to predict groundwater arsenic concentrations at any point in time. A separate validation dataset (n = 60 wells) was used to identify the model with strongest predictability. Findings indicate that arsenic concentrations are temporally stable (r = 0.88; 95 % CI 0.83–0.92 for samples collected from the same well 15–25 years apart) and the spatial model created using ordinary kriging best predicted arsenic concentrations (ρ = 0.72 between predicted and observed validation data). These findings illustrate the value of geostatistical modeling of arsenic and suggest the San Luis Valley is a good region for conducting epidemiologic studies of groundwater metals because of the ability to accurately predict variation in groundwater arsenic concentrations.

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Authors and Affiliations

  1. University of Colorado, Denver, Aurora, CO, 80045, USA

    Katherine A. James, Tim Byers, Gary O. Zerbe, John E. Hokanson & Julie A. Marshall

  2. State University of New York, Stony Brook, NY, USA

    Jaymie R. Meliker

  3. University of Colorado, Boulder, Boulder, CO, USA

    Barbara E. Buttenfield

Authors
  1. Katherine A. James
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  2. Jaymie R. Meliker
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  3. Barbara E. Buttenfield
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  4. Tim Byers
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  5. Gary O. Zerbe
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  6. John E. Hokanson
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  7. Julie A. Marshall
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Correspondence to Katherine A. James.

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James, K.A., Meliker, J.R., Buttenfield, B.E. et al. Predicting arsenic concentrations in groundwater of San Luis Valley, Colorado: implications for individual-level lifetime exposure assessment. Environ Geochem Health 36, 773–782 (2014). https://doi.org/10.1007/s10653-014-9595-6

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  • DOI: https://doi.org/10.1007/s10653-014-9595-6

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