ELECTROSPRAY MASS-SPECTRA OF ARSENIC COMPOUNDS

Positive ion electrospray mass spectra of arsenobetaine, AB, arsenocho line, AK, monomethylarsonic acid, MMA, dimethylarsinic acid, DMA, tetr amethylarsonium TMAs, arsenate, AsV, and arsenite,; AsIII, have been o btained. When appropriate, negative ion electrospray mass spectra have been performed, In order to clarify fragmentation pathways MS/MS spec tra have also been recorded, Positive ion electrospray mass spectra ha ve been found to be more useful for the identification of the organoar senic compounds AB, AK, MMA, DMA and TMAs, whereas negative ion electr ospray mass spectra is more suitable for the identification of the ino rganic compounds AsV and Asm. (C) 1997 by John Wiley & Sons, Ltd.