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本文用非离子型表面活性剂OP作增溶剂,使Br-BTAN与Cd的络合物稳定在水溶液中,借此进行镉的测定。在pH12～13的强碱性介质中,络合物最大吸收泼长为480nm,摩尔吸光系数为8.8×10~4。其它干扰元素采用抗坏血酸、酒石酸钾钠、柠檬酸钠、氟化钠联合掩蔽。方法应用于饮水、污染不太严重的工业废水中镉的测定。文献报导了在非离子型表面活性剂存在下,5-Br-DMPAP与镉的显色反应的研究;江淑芙报导用Triton X-100使Cd-PAN及Cu-PAN的螯合物增溶于水中;吴水生等也有类似报导。本文试验了聚乙二醇辛基苯基醚(OP)的增溶作用,使1—(6-溴-2-苯骈噻唑偶氮)—2—萘酚(Br-BTAN)与镉的螯合物稳定在水溶液中,成功地应用于光度法测定水中镉。
In this paper, non-ionic surfactant OP as a solubilizer, Br-BTAN and Cd complexes stabilized in aqueous solution, whereby cadmium determination. In the strong alkaline medium of pH12 ~ 13, the maximum absorption of the complex was 480 nm and the molar absorptivity was 8.8 × 10 ~ 4. Other interference elements using ascorbic acid, potassium sodium tartrate, sodium citrate, sodium fluoride combined masking. The method is applied to the determination of cadmium in industrial wastewater with drinking water and less serious pollution. The literature reports on the color reaction of 5-Br-DMPAP with cadmium in the presence of non-ionic surfactants. Jiang Shufu reported that the chelates of Cd-PAN and Cu-PAN were solubilized with Triton X-100 In the water; Wu Shui-sheng and other similar reports. In this paper, the solubilization of poly (ethylene glycol) octylphenyl ether (OP) and the chelation of 1- (6-bromo-2-benzothiazolylazo) -2-naphthol The stability of the compound in aqueous solution has been successfully applied to the photometric determination of cadmium in water.