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Comparison of the sum of As(III), As(V), dimethylarsinate (DMA), and monomethylarsonate (MMA) arsenic (Assum) and total dissolved arsenic measured by inductively coupled plasma mass spectrometry (ICP-MS; Asdiss): a) percent bias of Assum relative to Asdiss versus Asdiss, and b) cumulative distribution function plots for Assum (blue line, sum of speciation) and for Asdiss (green line, measured).
