2-ニトロソ-5-ジエチルアミノフェノールを用いるパラジウム(II)の吸光光度定量

概要

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2-Nitroso-5-diethylaminophenol (nitroso-DEAP) reacts with palladium to form the red complex in acidic solution {(2〜7)N H_2SO_4}. This complex is quite soluble in aqueous acidic solution and is very stable. Analytical-procedure is as follows. Transfer the sample solution containing about 30μg or less of Pd(II), to a 10ml volumetric flask. Add 3ml of 15N sulfuricacid and 1ml of nitroso-DEAP aqueous solution (6×10^<-3>M in O.1N H_2SO_4). Dilute it to 10ml with distilled water. After standing for about 5 min, measure the absorbance at 540nm. The molar absorptivity of the complex at 540nm is 2.33×10^4 l mol^<-1> cm^<-1>, and the absorbance of the reagent blank is 0.013±0.002. The composition of the complex is metal: ligand=1:2, and the complex does not decompose for at least 3 days. Less than 10^<-2>M of K^+, Na^+, NO_3^- and Cl^-, less than 10^<-3>M of Mg^<2+>, Ca^<2+>, Zn^<2+>, Cd^<2+>, Fe^<3+>, Co^<2+>, Ni^<2+>, Cu^<2+>, Hg^<2+>, Mo(VI), U(VI), Al^<3+>, Cr^<3+> and Br^-, less than 10^<-4>M of Rh(III), Pt(IV), Zr(IV), Mn^<2+> and Sn^<4+>, less than 5×10^<-6>M of W(VI)and less than 10^<-6>M of Sn^<2+> do not interfere with the analysis. By this procedure palladium in catalyst for the clarifier of car waste gas was determined.
社団法人日本分析化学会の論文
1978-10-05