黄原酯棉富集分离（CdI_4）^（2－）－罗丹明6G－明胶体系双波长光度法测定

Dual-wavelength SpectrophotometricDetermination of Cadmium with Cadmium-Iodide-Rhodamine 6G-Gelatin System afterIts Concentration Using Cotton CelluloseXanthate

基于罗丹明６Ｇ与（ＣｄＩ_４）^（２－）络阴离子的缔合反应，建立了双波长分光光度法测定痕量镉的新方法。方法选择性好，灵敏度高，摩尔吸光系数ε＝２．１４×１０~５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。本法与黄原酯棉富集分离相结合，已成功地应用于天然水中痕量镉的测定。

dual-wavelength spectrophotometricmethod for the determination of cadmiumwas established,based on the interaction ofrhodamine 6G with tetraiodocadmate(Ⅱ)an-ion. The method is of high sensitivity and se-lectivity. The molar absorptivity for cadmi-um is calculated to be 2.14× 10￣5L·mol￣(-1)·cm￣(-1). Combined with the concentration ofcadmium by using cotton cellulose xanthate,the proposed method has been successfullyapplied to the determination of cadmium innatural water.