銅(II)イオンとN,N-ジエチル-p-フェニレンジアミンを用いる水溶液中のシアン化物イオンの簡易吸光光度定量

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Spectrophotometric determination of cyanide ions in water was studied using Cu(II) ions and N,N-diethyl-p-phenylenediamine(DPD). A cyanide ions reacted with Cu(I) ions, producing a stable complex, CuCN (s.p. = 3.5×10^<-20>). Then, Cu(II) ions were reduced to Cu(I)ions with DPD owing to a decrease of Cu(I) ions. The concentaration of the coloring oxidant of DPD was proportional to the concentration of ryanide ions between 0.1 and 2.0 mg CN^-l^<-1>. The coloring development by this method was attained in one minute. A copper formate was the most suitable copper salt for a reaction in copper chloride, copper sulfate and copper acetate because of its highest sensitivity and lowest blank. The influences of co-existing metal ions [(Cr(III): 40 mgl^<-1>), (Ag(I): 0.3 mgl^<-1>), (Fe(II): 0.4 mgl^<-1>), (Fe(III): 3 mgl^<-1>), (Ni(II): 0.16 mgl^<-1>), (Co(II): 0.01 mgl^<-1>) and (Zn(II): 100 mgl^<-1>)] were less than 10% for 0.4 mgl^<-1> of cyanide ions. No influences of co-existing metals on the linearity of calibration curve were observed. This method is very simple, and can be used for the pre-detection of cyanide ions in waste water.
社団法人日本分析化学会の論文
2003-06-05