Atomic absorption detection dimethyl arsinate

Ricci and coworkers have described a highly sensitive, automated technique for the determination of MMAA, DMAA, p-aminophenyl arsonate, arsenite and arsenate. This procedure is based on ion-chromatography on a Dionex column, with 0.0024 M NaHC03/0.0019 M NajCOj/O.OOl M Na2B407 eluent, when all the compounds except arsenite and dimethyl arsinite are separated effectively. For separation of the last two, a lower ionic strength eluent (0.005 M Na2B407) can be used in a separate analysis. The detection system utilizes a continuous arsine generation system followed by heated quartz furnace atomization and atomic absorption spectrometry. Detection limits of less than 10 ng/ml were obtained for each species. 

Many other detectors have been used to monitor ion chromatography separations. Most of these detectors have been used only in special cases. Flame photometric detection [72, 73] has been used to detect alkali, alkaline earth, and some rare earth metals. Atomic absorption (AA) detectors [74-76] have been used for arsenite, arsenate, monomethyl arsenate, dimethyl arsinate, and p-aminophenoarsenate separations. Detectors of this type can be extremely sensitive detecting arsenic down to 10 ng/mL. 

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