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本文以多因素正交试验法研究了悬汞电极——吸附溶出新极谱法测定超痕量镉的络合物吸附体系,测量参数和分析指标。在乳酸(0.8%)—碘化钾(0.04M)—四丁基碘化铵(0.08%)体系中(pH=2.6),在约-0.70V(相对于饱和甘汞电极,下同)有一灵敏的络合物吸附波。用1.5次和2.5次微分新极谱法测量,线性范围为0.02—10ppb。方法比较灵敏、简便、选择性好。应用于天然水、自来水和人尿中痕量镉的测定,回收率均在(100±10)%之内。对反应机理进行了初步研究。
In this paper, multi-factor orthogonal test method was used to study the mercury adsorption-desorption polarographic determination of ultra-trace cadmium complex adsorption system, measurement parameters and analysis of indicators. In the system of lactic acid (0.8%) - potassium iodide (0.04M) - tetrabutylammonium iodide (0.08%) at pH = 2.6, there is a sensitivity of about -0.70V (with respect to the saturated calomel electrode, the same below) Complex adsorption wave. Measured with 1.5 and 2.5 differential neo-polarography, the linear range was 0.02-10 ppb. Method is more sensitive, simple, good selectivity. Applied to the determination of trace cadmium in natural water, tap water and human urine, the recovery rates are within (100 ± 10)%. The reaction mechanism of a preliminary study.