PVC膜电极的研究(Ⅰ)——铋(Ⅲ)氯络阴离子选择性电极的研制

Study on PVC Membrane Electrode(Ⅰ)--Development of a Chlorobismuthate(Ⅲ)Complex Anion-Selective Electrode

近几年,已有人研究过铋(Ⅲ)涂丝电极,该电极在10^(-4)—10^(-1)M铋(Ⅲ)浓度范围有近似线性的响应,斜率为36.5mV/pBi。本文以季铵盐7402-BiCl_(4)^(-)缔合物为电活性物质,以苯二甲酸二壬酯为增塑剂,研制成功了铋(Ⅲ)PVC膜电极。

A new bismuth(Ⅲ)ion-selective electrode of PVC membrane based on the associated susbstance of quaternary ammonium salt 7402[CH_(8)(CnH_(2)n+1)_(3)N]+Cl-,n=9-11]and bismuth chloride-complex has been prepared.The electrode exhibited a linear response to the chlorobismuthate(Ⅲ)complex anions within the concentration range 5×10^(-5)-1×10^(-1)M[Bi(Ⅲ)]in 2.5N HC1 solution.Detection limit is 3.5×10^(-6)M.Their calibration plots have a slope of 40mV per activity decade.It seems to be that the response characteristics of the membrane electrode is better than that of coated wire electrode.The electrode mentioned in this brief report may be used as a new tool for analysis of bismuth(Ⅲ)ion.