Determination of silver in alloys by controlled-potential electrolysis at a tantalum electrode.
A versatile method for the determination of Ag is described. It is based on controlled-potential electrolysis with a tantalum cathode in the presence of lactic acid at pH 2-6. An SCE of double-junction type with sodium formate bridge electrolyte is used as the reference electrode. The role of washing after electrolysis is studied and a novel technique suggested. The standard deviation of the determination is 0.13 mg. A preliminary separation is needed only if W is present. The proposed method has been satisfactorily applied to the analysis of a large number of silver alloys with different compositions.
Zhou
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Shanghai Research Institute of Materials, MMBEI, Shanghai, People's Republic of China.
Zhou
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M
He
C X
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Ju
Z Q
ZQ
Lin
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LF