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应用碘化钾-煌绿光度法测定废水中镉,以及利用碘化钾-罗丹明B光度法测定钢铁中铋已有报道。罗丹明B虽已用于许多元素的测定,但对镉的测定报道较少。本文研究了在聚乙烯醇存在下,[CdI_4]~2与罗丹明B形成三元离子缔合物的最佳测定条件。在拟定试验条件下,该离子缔合物的摩尔吸光系数为5.03×10~5,最大吸收波长为610nm,镉量在0～5μg/25ml符合比耳定律,回收率在96.2%～101.2%,操作简便、快速,应用于陶瓷浸出液中镉的测定,结果满意。1 仪器与试剂 751G型分光光度计镉标准工作液:1.0μg·ml~(-1),临用时用镉标准液(核工业北京化工冶金研究院提供)配制。碘化钾溶液:20%,取20g碘化钾加1.0g抗坏血酸溶于100ml去离于水中。2 操作方法
The determination of cadmium in wastewater by potassium iodide - brilliant green spectrophotometry and the determination of bismuth in steel by potassium iodide - rhodamine B spectrophotometry have been reported. Although rhodamine B has been used in the determination of many elements, but less reported on the determination of cadmium. In this paper, the optimum conditions for the formation of ternary ion association of [CdI_4] ~ 2 with rhodamine B in the presence of polyvinyl alcohol were studied. Under the experimental conditions, the molar absorption coefficient of the ion-association complex is 5.03 × 10 ~ 5, the maximum absorption wavelength is 610nm, and the amount of cadmium in the range of 0 ~ 5μg / 25ml accords with Beer’s law. The recoveries range from 96.2% to 101.2% Easy to operate, fast, used in the determination of cadmium in ceramic leachate, the results are satisfactory. 1 instruments and reagents 751G spectrophotometer standard cadmium working solution: 1.0μg · ml ~ (-1), when used with cadmium standard solution (nuclear chemical industry Beijing Institute of Chemical Metallurgy) preparation. Potassium iodide solution: 20%, take 20g potassium iodide plus 1.0g ascorbic acid dissolved in 100ml to the water. 2 operation method