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有关铟的化学分析方法有极谱法,络合滴定法,原子吸收光度法及化学光度法等。但这些方法由于锡、镍等元素的干扰,一般需萃取分离铟,因而使分析手续冗长且往往影响结果的准确性。为此我们进行了PAR直接光度法测定银锡铟合金中铟的试验。在PH5.3醋酸-醋酸钠缓冲体系中用酒石酸掩蔽锡,硫脲掩蔽银,此时铟和镍同时显色,利用氮三乙酸(NTA)褪色In-PAR而保留Ni-PAR
The indium chemical analysis methods polarography, complexometric titration, atomic absorption spectrophotometry and chemical photometry. However, due to the interference of tin, nickel and other elements, these methods usually need to extract and separate indium, thus making the analysis procedure lengthy and often affecting the accuracy of the result. To this end, we conducted a PAR direct photometric determination of indium silver silver-tin alloy test. Tartaric acid was used to mask the tin in the acetic acid-sodium acetate buffer system of pH5.3. Thiourea masked silver. At the same time, indium and nickel were colored at the same time. In-PAR was faded with nitrilotriacetic acid (NTA) to retain Ni-PAR