were transferred into
10 mL centrifuge tubes and added with 5 mL of 0.5 M H3PO4 solution.
The mixtures were shaken on a shaker for 16 h at room temperature,
followed by centrifugation at 5000 rpm for 20 min and
filtration with 0.45 lm cellulose acetate membranes to obtain
the final extracts. The recovery rates for As(V), MMA, DMA, ASA,
and ROX established from spiked samples were in the range of
67–102%, while that of As(III) was rather low (8.9%) because of