卟啉试剂与贵金属高灵敏显色反应的研究Ⅰ.Rh(Ⅲ)—T(4-AOP)P—SDS—TritonX-100体系

Study on Highly Sensitive Color Reactions of Porphyrin with Noble Metals I. Rh ( Ⅲ )-T ( 4-AOP ) P-SDS-Triton X-100 System

本文研究了在适量Cd(Ⅱ)和SDS—TritonX-100存在下,meso-四(4’-乙酰氧基苯)卟啉[T(4-AOP)P]与铑的显色反应.结果表明,在pH9.5～10.5介质中,Rh(Ⅲ)与T(4-AOP)P形成了灵敏度很高的稳定配合物,其ε_(420nm)=8.78×10~5.铑浓度在0～1.2μg/10ml范围内服从比尔定律.配合物中的摩尔比为Rh:T(4-AOP)P=1:1.将拟定的灵敏、简便的新方法,应用于测定催化剂中的Rh,得到了满意的结果.

A highly sensitive color reaction of rhodium(III)with njeso-tetrakis(4-acetyloxylphenyl)-porphyrin C T (4-AOP) P ] has been studied in the presence of Cd ( Ⅱ ), SDS and TritonX-100l. It is shown that the rhodium ( Ⅲ ) complex forms at pH 9.5-10.5 by heating at 100C for 15 min and the molar absorptivity of the complex is 8.78×105 at 420 nm. The complex is stable for at least 14 hours. The molar ratio of Rh(Ⅲ) to T(4-AOP)P is found to be 1 : 1. Beerfs law is obeyed in the range of 0-1.2ug/10ml for Eh ( Ⅲ ) . Tolerance limits have been shown for 25 diverse ions by the use of masking agents. The method has been applied to the direct determination of rhodium in the catalyst with satisfactory results.