Abstract
The gravimetric determination of metals as selenides is proposed. Owing to the rapid atmospheric oxidation of sodium selenide and the toxic nature of hydrogen selenide, special apparatus is required. The methods are analogous to precipitation of sulphides. Arsenic, tin, antimony, platinum, ruthenium, palladium, rhodium, rhenium, mercury, silver and gold can be determined. The thermolysis of precipitates formed with arsenic, antimony, mercury, silver, rhenium, platinum, ruthenium, palladium and rhodium has been studied.
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