The bioaccessibility of arsenic in the <250 micron fraction of the untreated soil, and in the <250 micron fraction of soil treated at a variety of soil to treatment solution ratios, has been estimated using a modified in vitro gastrointestinal (IVG) method. This method, in which arsenic-contaminated soil is placed in contact with simulated gastrointestinal solutions, has been shown to be linearly correlative with an in vivo bioavailability model. Comparison of IVG bioaccessible arsenic with arsenic extracted by a variety of other techniques show similar trends with increasing treatment solution to soil mass ratio. IVG bioaccessible arsenic is decreased by increased treatment solution to soil mass ratios and is not correlated with IVG bioaccessible iron, indicating that the in vitro test extracts arsenic that is not chemically fixed by the ferrous sulfate treatment.
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