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本文研究在非离子表面活性剂平平加(Peregal O)存在下,Pd~(2+)与1,10-邻菲啰啉(Phen),N-(对硝基偶氮苯)-对氨基偶氮苯(镉试剂A,Cadicn A)形成四元混配配合物的显色反应。实验表明,pH为8.2～10.5的缓冲介质中,平平加存在下,Pd~(2+)与Phen,Cadion A形成橙色配合物,λ_(max)=490nm,ε=8.01×10~4L·mol~(-1)cm~(-1),组成比Pd~(2+):Phen:CadionA=1:1:2,钯在0～20μg/25ml范围内服从比尔定律。本法操作简便,直接用于硅铝催化剂中微量钯测定,结果满意。
In this paper, Pd 2+ and 1,10-phenanthroline (Phen) and N- (p-nitroazobenzene) -p-amino couple were studied in the presence of nonionic surfactant Peregal O Nitrobenzene (Cadmium A, Cadicn A) forms a color reaction of a quaternary complex. The experimental results showed that Pd ~ (2+) forms an orange complex with Phen and Cadion A in the buffer medium with pH of 8.2 ~ 10.5, λ max = 490nm and ε = 8.01 × 10 ~ 4L · mol ~ (-1) cm ~ (-1), the ratio of Pd ~ (2 +): Phen: CadionA = 1: 1: 2 and Beer ’s law in the range of 0 ~ 20μg / 25ml. The method is simple and easy to use, and is directly applied to the determination of trace palladium in silica-alumina catalysts with satisfactory results.