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EDTA络合滴定铂时均在热溶液中进行,而络合滴定某些铂基合金中除铂外的其它元素时,为避免铂干扰需在室温下进行,但对基体铂的干扰问题尚有争议。本文就此问题进行了试验。结果表明:铂与EDTA在pH 8的碱性介质中,室温下放置2小时也不反应,在酸性介质中则何反应,如增加EDTA或铂浓度能使反应加快;氯离子浓度有影响应控制;乙酸钠用量达一定浓度会增大铂的干扰,但加入试剂后放置半小
EDTA complexation titration of platinum are carried out in hot solution, and complexation titration of some platinum-based alloys in addition to platinum other elements, in order to avoid platinum interference at room temperature, but the interference of the substrate platinum dispute. This article has carried on the test to this question. The results show that platinum and EDTA are not reacted for 2 hours at room temperature in alkaline medium of pH 8 and react in acidic medium, such as increasing the concentration of EDTA or platinum to accelerate the reaction; the influence of chloride ion concentration should be controlled ; Sodium acetate dosage reaches a certain concentration will increase the interference of platinum, but after adding the reagent to place a half small