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White Solid

Seven arsenic species have been quantified in a new NIST frozen human urine Std. Ref. Material (SRM) 2669. The species measured were: arsenite (As(III)), arsenate (As(V)), monomethylarsonate (MMA), dimethylarsinate (DMA), arsenobetaine (AB), arsenocholine (AC), and trimethylarsine oxide (TMAO).