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一、前言 Donoso等对铟-铜铁试剂的交流极谱波曾作过研究,但在其制定的磷酸盐缓冲体系中,铟的测定灵敏度不高,且在单扫描示波极谱仪上波形欠佳,因而不适于微量铟的测定。我们对铟-铜铁试剂络合物在弱酸性介质中的极谱行为进行了较仔细的研究,发现在pH3.8～6.3的醋酸盐缓冲介质中,于峰电位-0.80伏处,均能产生灵敏度很高的极谱波。通过实验,选定了最佳底液为pH5的醋酸-醋酸钠-铜铁试剂。波高与浓度的线性范围为0.005～1微克/毫升。本法测定铟的灵敏度较之目前采用的比色法、原子吸收和极谱法,要高出几倍到几十倍。方法操作简单,重现性好,适于岩石矿物中微量铟的测定。
I. Preface Donoso et al. Studied the AC Polarographic Wave of indium-cupferron reagent. However, in its phosphate buffer system, the determination sensitivity of indium is not high, and the waveform of single-sweep oscilloscope Poor, and therefore not suitable for the determination of trace indium. We investigated the polarographic behavior of indium-copper-iron complexes in weakly acidic media and found that in acetate buffers at pH 3.8 to 6.3, both at the peak potential of -0.80 V Can produce high sensitivity polarographic wave. Through experiments, the best choice of pH5 acetate - sodium acetate - copper and iron reagent. The linear range of wave height and concentration is 0.005 to 1 μg / ml. The sensitivity of the method for the determination of indium than the current colorimetric method, atomic absorption and polarographic method, several times to several times higher. The method is simple, reproducible and suitable for the determination of trace indium in rock minerals.