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1 引 言 目前国内外痕量、超痕量金的测定,主要有中子活化法、无火焰原子吸收法、化学光谱法等.本文研究了以甲酸还原磷钼酸为指示反应的催化动力学光度法测定天然水中痕量金.建立了反应的适宜条件,详细研究了共存离子的干扰情况.该法具有设备简单、操作简便、快速、灵敏度高、准确性好等优点.2 仪器与试剂 7210分光光度计(上海分析仪器厂),PHS-25型酸度计(上海雷磁仪器厂),恒温水浴.金标准液(lmg/mL,10μg/mL),金工作液(1×10-2μg/mL,1× 10-3ng/mL),钼酸铵溶液(9.3％),磷酸溶液(03％),硫酸汞溶液(0.03％),甲酸-甲酸钠缓冲溶液(PH=3.2).
1 Introduction At present, the determination of trace and ultra trace gold at home and abroad mainly includes the neutron activation method, flameless atomic absorption spectrometry, chemical spectroscopy, etc. In this paper, the catalytic kinetic spectrophotometric determination of phosphomolybdic acid The method was applied to the determination of trace gold in natural water. The suitable conditions for the reaction were established and the interference of coexisting ions was studied in detail. The method has the advantages of simple equipment, easy operation, high speed, high sensitivity and good accuracy. PHS-25 pH meter (Shanghai Lei Magnetic Instrument Factory), constant temperature water bath, gold standard solution (lmg / mL, 10μg / mL), gold working solution (1 × 10-2μg / mL , 1 × 10-3 ng / mL), ammonium molybdate solution (9.3%), phosphoric acid solution (03%), mercuric sulfate solution (0.03%) and formic acid-sodium formate buffer solution (pH = 3.2).