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作者新近合成对-苯磺酸重氮氨基偶氮苯,结构式为:暂称新镉试剂。该试剂的合成、性质及有Triton X-100存在的弱碱性介质中与汞、镉和镍有极灵敏的显色反应,以及用于光度法测定废水中痕量汞已有报导。本文研究该试剂与镉(Ⅱ)的显色反应及各因素对显色反应的影响。用甲基异丁酮(MIBK)从H_2SO_4-Kl介质中萃取富集水样中镉,同时与汞(Ⅱ)、镍(Ⅱ)、锌(Ⅱ)、
The authors recently synthesized p -benzenesulfonamidazobenzene, structural formula: tentatively called the new cadmium reagent. The synthesis and properties of this reagent and its extremely sensitive color reaction with mercury, cadmium and nickel in weakly alkaline medium with Triton X-100, as well as the spectrophotometric determination of trace mercury in wastewater have been reported. In this paper, the color reaction of the reagent with cadmium (Ⅱ) and the influence of various factors on the color reaction were studied. The concentration of cadmium in water samples was extracted from H_2SO_4-Kl medium by methyl isobutyl ketone (MIBK), and the contents of cadmium, mercury (Ⅱ), nickel (Ⅱ), zinc