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以长链季铵盐为活性物研制成功PVC膜三氯乙酸根离子选择电极。该电极在1×10~(-1)～2×10~(-6)M Cl_3CCOO-离子浓度范围内显示良好的Nernst响应,检测下限为1.2×10~(-6)M。用固定干扰法测定了该电极对Ac~-、Cl~-,SO_4~-、H_2PO_4~-、HCO_3~-、CO_3~-,Cl_2CHCOO~-、NO_3~-等离子的选择性系数,仅NO_3~-有明显干扰。电极适用于中性、偏碱性溶液,在1×10~(-3)M Cl_3CCOONa溶液中,pH 7.0～12.5电势读数稳定。电极连续工作五小时电势变化为±1mV,可以作为一种分析三氯乙酸盐的简便快速方法。这对控制环境污染,判断职业中毒都十分重要。
The long-chain quaternary ammonium salt as active material was successfully developed PVC membrane trichloroacetate ion selective electrode. The electrode showed a good Nernst response in the concentration range of 1 × 10 ~ (-1) ~ 2 × 10 ~ (-6) M Cl_3CCOO- with the detection limit of 1.2 × 10 ~ (-6) M. The selectivity coefficients of Ac ~ -, Cl ~ -, SO_4 ~ -, H_2PO_4 ~ -, HCO_3 ~ -, CO_3 ~ -, Cl_2CHCOO ~ - and NO_3 ~ Obvious interference. Electrode for neutral, alkaline solution, in 1 × 10 ~ (-3) M Cl_3CCOONa solution, pH 7.0 ~ 12.5 potential reading stable. Five hours of continuous electrode potential change of ± 1mV, can be used as a simple and rapid method for the analysis of trichloroacetate. This is very important for controlling environmental pollution and judging occupational poisoning.