对亚硝基二甲基苯胺是测定钯的灵敏显色剂,但铂有干扰,Yoe等曾以此试剂为萃取剂,氯仿为溶剂,使钯与铂分离,在蒸干萃取液并用浓硝酸、过氧化氢处理后的水溶液中,又以此试剂为显色剂对钯进行了光度测定。这一方法的缺点是分离和测定两步割裂进行,操作麻烦。为此作者试验了在溴甲酚红存在下,形成钯-对亚硝基二甲基苯胺-溴甲酚红三元络合物的化学条件,测定了组成及其对光的吸收性质,考察了多种离子的影响,确立了分离和测定两步相结合测定微量钯的萃取光度分析方法,灵敏度和选择性较Yoe等的方法均有提高,用于催化剂中钯的测定,获得了满 The p-nitrosodimethylaniline is a sensitive reagent for the determination of palladium, but platinum has interference. Yoe et al. Used this reagent as an extractant and chloroform as a solvent to separate palladium from platinum. The extract was evaporated to dryness and concentrated with concentrated nitric acid , Hydrogen peroxide treatment of the aqueous solution, but also with this reagent as a chromogenic reagent for palladium photometric determination. The disadvantage of this method is the separation and determination of two-step fragmentation, the operation is cumbersome. To this end, the authors tested the chemical conditions for the formation of the palladium-p-nitroso-dimethylaniline-bromocresol red ternary complex in the presence of bromocresol red and the composition and its absorption properties to light A variety of ions, the establishment of a two-step separation and determination of trace palladium determination of extraction spectrophotometry, the sensitivity and selectivity than Yoe and other methods have improved for the determination of palladium in the catalyst, was full