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Chromatograms (HPLC-ICP-MS) using SEC (30 mm phosphate buffer pH 5.6) for As speciation (mass-to-charge ratio [m/z] 75). a, Standard mixture of pentavalent and trivalent inorganic As [As(III) and As(V)] and their methylated counterparts [monomethyarsonic acid (MMA) (III), MMA(V), dimethylarsinic acid (DMA) (III), and DMA(V)]. b, P. vittata cultured in hydroponic solution containing either 50 μm arsenate or 50 μm arsenite.
