【摘要】 研究了在聚乙烯醇－明胶共存下，罗丹明Ｂ和ＣｄＩ２－４的高灵敏显色反应，并制定了新的光度法．缔合物的最大吸收为５８５ｎｍ，表观摩尔吸光系数ε＝１．１×１０６Ｌ·ｍｏｌ－１·ｃｍ－１．回收试验和精密度表明，该法测定的精密度和回收率都很好，，是测定镉的高灵敏度的方法之一。更多还原

【Abstract】 The colour reaction of cadmium(Ⅱ) with rhodamine B in the presence of gelatin and polyvinyl alcohol is studied, and a new highly senstitive spectrophotometric method for the determination of trace cadmium is proposed. The maximum absorption of ion association complex is at 585nm and apparent molar absorptivity is 1.1×10 6 L\5mol -1 \5cm -1 at 585nm. Beer′s law is obeyed for cadmium in the range from 0.1 to 0.6 μ g/10mL. The recovery is between 98.6% and 100.7% respectimvely for determinations.更多还原