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测定微量钯的有机显色剂种类较多.其中选择性和灵敏度较好的是杂环偶氮化合物,但所有钯的显色反应无例外地需要加热,或需有机溶剂萃取.偶氮氯磷类试剂测定钯亦有报道.本文采用偶氮氯膦pA[2-(4氯-2-膦酸基苯偶氮)-7-(4-乙酰基苯偶氮)-1,8-二羟基-3,6-萘二磺酸]与钯离子在常温下于水相中形成蓝色络合物,其表观摩尔吸光系(?)_(650)4.5×10L·mol~(-1)·cm~(-1),钯含量在0.0～1.0 mg/L范围内符合比耳定律.建立了测定微量钯的分光光度分析法.本法具有简便快速,室温下在水相中直接测定微量钯的优点.应用于催化剂中钯含量的测定,结果令人满意.
There are many kinds of organic chromogenic reagent for the determination of trace palladium, of which heterocyclic azo compounds are the best selectivity and sensitivity, but all the chromogenic reactions of palladium need to be heated without exception or require organic solvent extraction. The determination of palladium by the reagent has also been reported.In this paper, chlorophosphonazo pA [2- (4-chloro-2-phosphonophenylazo) -7- (4-acetylphenylazo) -1,8-dihydroxy -3,6-naphthalenedisulfonic acid] and palladium ion form a blue complex in the aqueous phase at room temperature, the apparent molar absorptivity (?) _ (650) 4.5 × 10L · mol ~ (-1) · Cm ~ (-1), and Beer’s law was obeyed in the range of 0.0 ~ 1.0 mg / L. Palladium content was established by spectrophotometric method for the determination of trace palladium.The method has the advantages of simple and rapid, direct determination of trace The advantages of palladium. Used in the determination of palladium content in the catalyst, the results are satisfactory.