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本文讨论了0.1NHCl——0.5MKI的溶液中加入2.5％的N—235二甲苯溶液萃取镉,使与干扰离子铁、镍、锡、汞等分离.然后用1.5NNaOH—0.025M酒石酸钾钠反萃取,萃取镉的总回收率大于95％。将反萃取后溶液在PH=3—6的0.04MNH_2OH.HCl—0.01M酒石酸钾钠—0.06MKI的底液中,用导数示波极谱测定.检出最低浓度为10ppb.工作曲线法定量,在20ppb—1ppm具有良好的线性关系.本法干扰少,适合于纯镍及金属镍产品中痕量、微量镉的分析.
In this paper, we discuss the extraction of cadmium with 2.5% N-235 xylene solution in 0.1N HCl - 0.5M KI and separate it from interfering iron, nickel, tin, mercury, etc. Then use 1.5N NaOH-0.025M potassium sodium tartrate The total recovery of extracted and extracted cadmium is more than 95%. After the stripping solution in PH = 3-6 of 0.04MNH_2OH.HCl-0.01M sodium potassium tartrate -0.06MKI the bottom liquid, using the determination of the oscillopolarographic determination of the minimum concentration of 10ppb detected by the working curve of quantitative, 20ppb-1ppm has a good linear relationship.This method less interference, suitable for pure nickel and nickel metal products trace, trace analysis of cadmium.