本文是在文献的基础上选用吐温-80增溶增色镉-试镉灵络合物,测得在475nm处摩尔吸光系数为1.5×10~5,在0～16微克镉/50毫升范围内符合比尔定律,此法显色稳定灵敏度高,适应性广,利用铜试剂-氯仿萃取富集镉,免去用氰化物之弊。在应用此法测定土壤、矿石及工业废水中痕量镉,结果满意,可与原子吸收光度法或极谱法媲美。实验部分一仪器和试剂国产721型分光光度计和英国H_(700)。分光光度计。镉标准溶液:100υg Cd ml~(-1),用优级纯碳酸镉配制,使用时再稀释。试镉灵(Cadion)乙醇溶液:0.02%,称取0.100克试镉灵溶于500毫升0.02N氢氧化钾的乙醇溶液 This article is based on the literature on the selection Tween -80 solubilization of color-enhanced cadmium - cadmium test complex, measured at 475nm molar extinction coefficient of 1.5 × 10 ~ 5, in 0 ~ 16 micrograms of cadmium / 50 ml range According to Beer’s law, this method has the advantages of high color stability and high sensitivity and wide adaptability. It uses copper reagent-chloroform extraction to enrich cadmium, eliminating the disadvantages of using cyanide. In this method of determination of trace amounts of cadmium in soil, ore and industrial wastewater, the results are satisfactory, comparable with atomic absorption spectrometry or polarography. Experimental part of an instrument and reagents Domestic 721 spectrophotometer and the British H_ (700). Spectrophotometer. Cadmium standard solution: 100 υg Cd ml ~ (-1), with excellent grade pure cadmium carbonate preparation, when used and then diluted. Test cadion (Cadion) ethanol solution: 0.02%, weighed 0.100 grams of cadmium dissolved in 500 ml 0.02N potassium hydroxide in ethanol