METHODSin which tetraphenylarsonium chloride may be used as an analytical reagent for mercury, tin, cadmium, zinc, and perrhenate have been developed by the authors and will be described in subsequent papers. Lamprey (8), who did the exploratory research in connection with the reagent, showed that it could be used for the determination of perchlorate, periodate, gold, and platinum, but his studies were not exhaustive. He showed that the reagent could be used gravimetrically, or volumetrically by titrating the excess of standard reagent potentiometrically with iodine.
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