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.
The suppressive effect of increasing resistance in the cell circuit on the maximum in the polarographic c. v. curve of mercurous ions, first discovered by Brdicka, has been confirmed. It has also been found that the maxima of oxygen, lead ions, nickel ions, and zinc ions, are all more or less suppressed by a large resistance in series with the cell, and it is concluded that the effect is of general occurrence.An explanation of this effect has been given, based on the fact that the e. m. f. actually applied across the cell decreases during the life of each mercury drop when a large external resistance is in series with the cell.
Berkeley, California
The four methods by which alkali and alkali-earth amalgams have been prepared are:i. Directly from metals. 2. By the action of an amalgam on a salt solution. 3. By the electrolysis of a complex alkali-mercury salt in aqueous solution, with platinum electrodes. 4. By the electrolysis of a salt solution with a mercury cathode.
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