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分光光度法测定铅,已报导了双硫腙、PAR、硫代奥克辛和二乙基二硫代氨基甲酸钠间接法等,其中双硫腙法灵敏度高,应用最广泛。但是,此法选择性差,还要使用剧毒的氰化物,危害身体,污染环境。其他方法灵敏度欠佳,选择性也不好。三苯甲烷染料与许多金属的卤络阴离子形成可被苯等有机溶剂萃取的三元络合物,具有较高的灵敏度和选择性,并广泛应用于锑、铟、镓、金、铊、碲等的分光光度法测定。铅是易与卤素离子生成稳定卤络阴离子的元素之一。利用铅的卤络阴离子与三苯甲烷染料形成的三元络合物萃取法测定铅至今还未见报导,最近,我们试验了用苯萃取铅的碘络阴离子与孔雀绿形成的三元络合物的诸条件,并拟定了测定铅的方法,为微量铅的测定开辟了一个新途径。利用孔雀绿法测定铅、灵敏度高,快速简便,不使用剧毒的氰化物。
Spectrophotometric determination of lead has been reported as an indirect method for dithizone, PAR, thiocresin and diethyldithiocarbamate, among which dithizone has the highest sensitivity and is the most widely used. However, this method is poor selectivity, but also the use of toxic cyanide, endangering the body, pollute the environment. Other methods of poor sensitivity, selectivity is not good. Triphenylmethane dyestuffs and many metal halide complex anions form ternary complexes that can be extracted with organic solvents such as benzene, which have high sensitivity and selectivity and are widely used in antimony, indium, gallium, gold, thallium and tellurium Etc. spectrophotometry. Lead is one of the elements that readily form stable halogenated anions with halide ions. Lead has not yet been reported to be detected by the ternary complex extraction method using the halogenated complex anions of lead and triphenylmethane dyes. Recently, we have investigated the ternary complexation of lead iodine anions with malachite green by benzene extraction Material conditions, and developed a method for the determination of lead, for the determination of trace lead opened up a new way. Determination of lead by malachite green method, high sensitivity, fast and easy, do not use highly toxic cyanide.