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叙述了PVC膜连四硫酸根选择电极的研制方法,该电极活性物质为季铵盐。膜的最佳组份为2％(W/W)三庚基十二烷基碘化铵(THDDA),68％邻苯二甲酸二(2-乙基已)酯(DEHP)和30％PVC。电极响应S_4O_6~(2-)的线性范围为1×10~(-5)—1×10~(-1)mol/L,检测限为1×10~(-6)mol/L。在pH4.5至10,其电位值不受pH的影响。该电极对不同阴离子的选择性系数为S_2O_6~(2-)4.4×10~(-3),S_3O_6~(2-)1.4×10~(-1),SO_4~(2-)、S_2O~(2-)和SO_3~(2-)10~(-5)。可用S_4O_6~(2-)PVC离子选择电极直接测定铀矿石碱浸液中S_4O_6~(2-)含量。S_4O_6~(2-)的检测限为10mg/L,相对标准偏差为±10％。
The preparation method of PVC membrane with tetrathionate selective electrode is described. The electrode active material is quaternary ammonium salt. The best components of the film are 2% (w / w) triheptyldodecylammonium iodide (THDDA), 68% DEHP and 30% PVC . The linear range of the electrode response S_4O_6 ~ (2-) was 1 × 10 -5 -1 × 10 -1 mol / L with a detection limit of 1 × 10 -6 mol / L. At pH 4.5 to 10, its potential value is unaffected by pH. The selectivity coefficients of the anions for different anions were 4.4 × 10 ~ (-3), 1.4 × 10 ~ (-1), SO_4 ~ (2), S_2O ~ 2-) and SO_3 ~ (2-) 10 ~ (-5). S_4O_6 ~ (2-) PVC ion selective electrode can be used to directly determine the content of S_4O_6 ~ (2-) in uranium ore alkali immersion liquid. The detection limit of S_4O_6 ~ (2-) is 10mg / L, the relative standard deviation is ± 10%.