天然多糖体"キチン"とマレオニトリルジチオラトイオンを用いるニッケル(II),銅(II)及びカドミウム(II)の簡易迅速分離濃縮法

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A simple and rapid concentration method for 10^<-8> mol dm^<-3> levels of nickel(II), copper(II) and cadmium(II) ions with maleonitriledithiolate ion(mnt^<2->) and chitin was developed. At pH 5 protonated acetylamino groups of the chitin acted as an anion exchanger. Metal ions(M^<2+>) reacted with mnt^<2-> to form[M(mnt)_2]^<2-> complex, and adsorbed on the chitin. Ion exchange capacity of the chitin was 0.146 mmol/g. More than 93% of the adsorbed [Ni(mnt)_2]^<2-> complex was able to be recovered with 1 : 1 mixture of ammonia buffer solution (0.2 mol dm^<-3>, pH 10) and acetone. A recommended procedure : Pack chitin powder (0.5 g) into a column (5 cm^3 syringe, i. d. 12 mm). Take a sample solution(500 or 1000 cm^3) containing the metal ions was into a beaker. Add acetic acid-sodium acetate buffer solution (pH 5) and Na_2mnt ([mnt^<2->]_T=5×10^<-5> mol dm^<-3>). Allow the mixture to pass through the chitin column at a flow rate of 120〜150 cm^3/min and elute the adsorbed complexes with 10 cm^3 of a 1 : 1 mixture of ammonia buffer solution and acetone. The recovery for 10^<-8>〜10^<-7> mol dm^<-3> levels of nickel(II) and copper (II) ions were more than 90% with a concentration ratio of 50 or 100 and that of cadmium(II) ion was about 85%. This method was successfully applied to the determination of 10^<-7> mol dm^<-3> levels of copper(II) ion in residual water of the water distilling apparatus by flame AAS.
社団法人日本分析化学会の論文
1986-10-05

天然多糖体"キチン"とマレオニトリルジチオラトイオンを用いるニッケル(II),銅(II)及びカドミウム(II)の簡易迅速分離濃縮法

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