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This presentation will highlight recent advances in mass spectrometry studies of arsenic species and their binding to proteins.High performance liquid chromatography(HPLC)separation and simultaneous detection with both inductively coupled plasma mass spectrometry(ICPMS)and electrospray ionization tandem mass spectrometry(ESI-MS/MS)enabled identification and quantitation of individual arsenic species present in various environmental samples.Synthesis of arsenic standards helped facilitate identification of new arsenic metabolites.