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以季铵盐为活性物质,研制了氟硼酸根离子聚氯乙烯膜电极。实验比较了不同活性物质在膜相中浓度和不同增塑剂对电极性能的影响。结果表明,用2％三庚基十二烷基氟硼酸铵、68％邻苯二甲酸二(2-乙基己)酯,30％聚氯乙烯制成的电极,对氟硼酸根离子的线性测量范围为10~(-1)～1×10~(-6)M,检测下限8×10~(-7)M,较文献报道为好。测定了电极对常见离子的选择性系数,除ClO_4~-、CNS~-、I~-有干扰外,其余常见阴离子的选择系数值均在10~(-3)～10~(-6)数量级。电极的重现性、稳定性、寿命等均较好。
With quaternary ammonium salt as the active material, a fluoroborate ion polyvinyl chloride membrane electrode was developed. The effects of different active substances in the membrane phase and different plasticizers on the performance of the electrodes were compared experimentally. The results show that the electrode made of 2% heptyldodecyl ammonium borofluoride, 68% di (2-ethylhexyl) phthalate, 30% polyvinyl chloride, the linearity of the fluoroborate ion The measurement range is from 10-1 to 1 × 10 -6 M, and the detection limit is from 8 × 10 -7 M, which is better than that reported in the literature. The selectivity coefficients of the common ions to the electrodes were determined. Except for the interferences of ClO 4 -, CNS 1 - and I 1 -, the selectivity coefficients of other common anions were in the order of 10 -3 to 10 -6 . Electrode reproducibility, stability, life, etc. are better.