ANMOL CHOUGALE
Question 7
Cation exchange resin is used for exchange
of
anion
neutral species
cation
both anion and cation
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Cation exchange resins, anion-exchange resins, and reverse-phase materials have been used as stationary phases to separate arsenite, arsenate, methylarsonic acid, dimethylarsinic acid, and trimethylarsine oxide. As mobile phases that control the ionization of the analytes and Influence their retention, water, acetic acid, acetate buffers, trichloroacetic acid, hydrochloric acid, aqueous solutions of ammonium carbonate, ammonium hydrogen carbonate, ammonia, sodium hydroxide, and sodium dihydrogen phosphate were used sequentially or in a gradient operation. With reverse phase columns aqueous dimethylformamide, acetonitrile, methanol, or acetic acid were employed with sodium heptanesulfonate, tetrahepthylammonium nitrate, or hexadecyltrimethylammonium bromide as ion-pairing reagents. The matrices in which these arsenic compounds were determined include water, urine, and extracts from plant tissues, animal tissues, fresh water sediments, and estuarine sediments. The absolute detection limits of these analysis systems were reported to be as low as two nanograms of arsenic [370,371]. All five arsenic compounds (arsenite, arsenate, methylarsonic acid, dimethylarsinic acid, trimethylarsine oxide) were separated on an Aminex A-27 (Bio-Rad) anion exchange resin with a gradient of water to 0.2 M aqueous ammonium carbonate [379,380].
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