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1.前言 4’-磺胺偶氮氯膦(简称4’-SMCP)是一种不对称偶氮氯膦类试剂,由于它与稀土元素有较好的络合能力,因此经常做为稀土元素的显色剂.有人曾利用4’-SMCP做为显色剂测定稀土元素.本文研究了4’-SMCP与Pd(Ⅱ)的分光光度行为,实验发现在酸性介质中(>0.1MHNO_3),4’-SMCP与Pd(Ⅱ)于624nm处有最大吸收,ε=5.1×10~4L·mol~(-1)·cm~(-1).钯含量在55μg/ml以下符合比尔定律,最低检测限1μg/25ml(0.04ppm).络合物的摩尔比为Pd∶4’-SMCP=1∶2,络合物表观稳定常数约7.2×10~(11). Pd(Ⅱ)与其它元素的分离和富集多采用萃取法,也有人曾用阳离子交换树脂分离Pd(Ⅱ),但高价阳离子与之分离有一定困难.本文研究了Pd(Ⅱ)于阴离子交换树脂
1. Introduction 4’-Sulfachloracyl chlorophosphonates (referred to as 4’-SMCP) is an asymmetric chlorophosphonazo reagent, due to its better complexation with rare earth elements, it is often used as a rare earth element Some people have used 4’-SMCP as a reagent for the determination of rare earth elements.In this paper, the spectrophotometric behavior of 4’-SMCP and Pd (Ⅱ) was investigated in an acidic medium (> 0.1MHNO_3), 4 The maximum absorption of -SCP and Pd (Ⅱ) at 624 nm is ε = 5.1 × 10 -4 L · mol -1 (-1) cm -1 .The Beer’s law is obeyed when the content of palladium is below 55 μg / ml, the lowest detection The molar ratio of Pd (Ⅱ) to SMCP is 1: 2 and the apparent stability constant of the complex is about 7.2 × 10 ~ (11) .Pd (Ⅱ) and other elements Of the separation and enrichment using more extraction methods, some people have used cation exchange resin separation of Pd (Ⅱ), but the separation of high-priced cations have some difficulties.In this paper, Pd (Ⅱ) anion exchange resin