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This document assesses sampling, preservation, and analytical procedures for arsenic speciation in potentially contaminated waters. It finds that conventional field sampling using 0.45-mm filters may overestimate dissolved arsenic concentrations by allowing suspended particles to pass through. For neutral pH, iron-poor waters, arsenic species are stable for up to 3 days without treatment, but a preservative like phosphoric acid is needed for longer periods. The optimal analytical procedure depends on the le

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