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Groundwater arsenic in the Red River delta, Vietnam ... - Fiva

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Postma et al., submitted to Geochim. Cosmochim. Acta<br />

Fig. 5. Results of parallel extractions of oxidized aquifer sediment with 10 mM ascorbic<br />

acid for reductive dissolution and for proton <strong>in</strong>duced dissolution with HCl. Both<br />

experiments were done at pH 3. For <strong>arsenic</strong>, <strong>the</strong> difference between As(tot) and As(V)<br />

is present as As(III).<br />

40

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