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The arsenic content of groundwater consumed by millions of people in the developing world has become a major health concern. We report here an optimization of the colorimetric method of Johnson and Pilson (1972) to accurately measure As concentrations in the <0.03–5.3μmolL −1 (<2–400μgL −1 ) range in groundwater containing 2–30μmolL −1 dissolved phosphate. The optimization...
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