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铬(Ⅵ)离子选择电极已有报道。固膜电极用铬酸钡或铬酸铅为活性材料,流动载体电极多采用离子缔合型交换剂,如季铵盐、季鏻盐、结晶紫、四苯鉮和邻二氮菲等。ypycoB等用四辛铵等制成的PVC膜电极,线性响应下限为1×10~(-5)M。本文报道以三庚基十二烷基碘化铵为活性材料的铬(Ⅵ)离子选择电极,在氢氟酸体系中其线性响应下限为2×10~(-6)M,斜率为58mV(25℃),选择性优于ypycoB报道的电极。一、仪器
Chromium (VI) ion selective electrode has been reported. Solid-state electrode with barium chromate or lead chromate as the active material, the mobile carrier electrode and more use of ion-association exchangers, such as quaternary ammonium salts, quaternary phosphonium salts, crystal violet, tetraphenyl and phenanthroline. ypycoB such as using tetraoctylammonium made PVC membrane electrode, the linear response of the lower limit of 1 × 10 ~ (-5) M. In this paper, chromium (Ⅵ) ion selective electrode using triheptyldodecylammonium iodide as active material has a linear response lower limit of 2 × 10 -6 M in hydrofluoric acid system with a slope of 58 mV 25 ° C) with better selectivity than those reported by ypycoB. First, the instrument