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用硝酸六氨三价钴重量法测定铂—铑、铂—铑—金、铂—钯—铑合金中的铑(5～35毫克)。文中介绍了沉淀体积、放置时间、沉淀酸度及试剂用量等系统条件试验及所选定的测定条件。90毫克铂、20毫克钴、10毫克钌、钯、锇、镍、铜、铅,0.3毫克铁不干扰测定。铱对测定严重干扰。按合金组成比合成试验,相对误差为≤±1％并提出对这些合金分析的测定手续。
Determination of rhodium (5 to 35 mg) in platinum - rhodium, platinum - rhodium - gold and platinum - palladium - rhodium alloys by the hexaammine trivalent cobalt nitrate gravimetric method. In this paper, the system conditions such as sedimentation volume, storage time, acidity of precipitation and dosage of reagent are introduced. 90 mg platinum, 20 mg cobalt, 10 mg ruthenium, palladium, osmium, nickel, copper, lead, 0.3 mg iron do not interfere with the assay. Iridium on the determination of serious interference. According to the alloy composition ratio test, the relative error is ≤ ± 1% and the determination of these alloys is proposed.