α,β,γ,δ-テトラキス(1-メチルピリジニウム-4-イル)ポルフィンとそのカドミウム(II)キレートのガラス壁への吸着防止

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Complexation of cadmium (II) with α,β,γ,δ-tetrakis(1-methylpyridinium-4-yl)porphine (TMPyP) was ex amined in a micellar solution of sodium dodecylbenzene-sulfonate (SDS). Although complexation in the absence of SDS quantitatively occurs within 5 min in the pH range 9 to 11.5, TMPyP and its cadmium (II) chelate in a basic solution give rise to adsorption on glassware surface, thus resulting in large errors in the determination of cadmium (II). The adsorption of TMPyP and its chelate was prevented by addition of SDS after complete complexation. When SDS was added before complexation, 40 h were required for full color development. The concentration of SDS should be higher than the critical micelle concentration (1×10^<-3> mol dm^<-3>). SDS was also effective in preventing adsorption of other TMPyP chelates, such as lead (II), zinc (II) and copper (II), on the surface of glassware.
社団法人日本分析化学会の論文
1986-06-05