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关于锇的显色试剂在Snell的专著中已有综述。但现有比色用有机显色剂的灵敏度还不能满足矿石中微量锇的测定要求。作者曾报导过应用γ-酸作为微量锇的显色试剂,该试剂测锇的ε_(500nm)达50万升/摩尔·厘米以上,可与催化比色法测锇的灵敏度比美。γ-酸与锇(Ⅷ)在常温下显色很慢,但在加热至沸时则能很快显色完全,呈橙红色;常与锇共存的钌(Ⅷ)则不需加热就可立即显出绿色,但灵敏度远不及与锇(Ⅷ)的反应高,加热煮沸后变化也不大。因此可允许在有较多量钌存在下测锇。
The chromogenic reagent for osmium has been reviewed in Snell’s monograph. However, the sensitivities of the existing organic color-developing agents for colorimetric testing can not meet the requirements for the determination of trace osmium in ores. The authors have reported the use of γ-acid as a trace osmium chromogenic reagent, the reagent measured osmium ε_ (500nm) of 500,000 l / mol · cm or more, with the catalytic colorimetric osmium sensitivity than the United States. γ-acid and osmium (Ⅷ) color at room temperature is very slow, but when heated to boiling it can quickly color completely, orange-red; often coexist with ruthenium (Ⅷ) without heating can be immediately Show green, but the sensitivity is far less than the reaction with osmium (Ⅷ), the change after heating boiling is not large. Thus osmium can be allowed to be measured in the presence of a larger amount of ruthenium.