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SPECIATION AND PRESERVATION OF INORGANIC ARSENIC IN DRINKING WATER SUPPLIES WITH IC-ICP-MS
Citation:
Schwegel, C A., P A. Gallagher, X. Wei, AND J T. Creed. SPECIATION AND PRESERVATION OF INORGANIC ARSENIC IN DRINKING WATER SUPPLIES WITH IC-ICP-MS. Presented at 2000 Winter Conference on Plasma Spectrochemistry, Ft. Lauderdale, FL, January 10-15, 2000.
Impact/Purpose:
To develop an in-field preservation strategy for As(III) and As(V) in iron rich drinking waters which will allow samples to be shipped to the laboratory for arsenic speciation analysis. The overall goal is to improve treatment decision making and in turn minimize exposure to arsenic resulting from the consumption of drinking water.
Description:
The speciation of inorganic arsenic in drinking water supplies is an essential part of devising an appropriate treatment process. Arsenate, because of its anion characteristics at drinking water pHs, is effectively removed by anion exchange treatment while arsenite remains in the treated drinking water. One of the issues in this analysis pertains to the preservation of the native As(III)/As(V) distribution during the transport of the sample to the laboratory. Some of the potential problems are due to changes in dissolved oxygen and waters containing elevated concentrations of iron. This poster will evaluate preservation techniques designed to curcumvent the redox changes which occur during shipment.