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硫氰酸根离子选择电极在国内外均有报导。它用于电镀工业、环境监测等方面有着重要意义。但是,根据现有资料报导,硫氰酸根电极多是以AgSCN为电活性物质的固态膜电极,测量范围1M～5×10~(-6)M,斜率约为56mV,S~(2-)、I~-、CN~-、Br~-等均有很大干扰。我们采用三庚基十二烷基碘代季铵为活性物质制成的PVC膜硫氰酸根电极,其稳定性和重现性良好,线性响应下限为5×10~(-6)M,测量下限可达7.3×10~(-7)M,除了CIO_4~-、BF_4~-等少数离子有干扰外,S~(2-)、CN~-、Br~-等常见阴离子均无干扰。
Thiocyanate ion selective electrode both at home and abroad have been reported. It is used for electroplating industry, environmental monitoring and other aspects of great significance. However, based on available data, most of the thiocyanate electrodes are solid-state membrane electrodes with AgSCN as the electroactive substance. The measurement range is 1 M ~ 5 × 10 -6 M, the slope is about 56 mV, , I ~ -, CN ~ -, Br ~ - and so on have great interference. We use three heptyl dodecyl iodide quaternary ammonium as active material made of PVC membrane thiocyanate electrode, its stability and reproducibility is good, the linear response of the lower limit of 5 × 10 ~ (-6) M, measured The lower limit is up to 7.3 × 10 ~ (-7) M. Except CIO_4 ~ -, BF_4 ~ - and some other ions have interference, the common anions such as S ~ (2 -), CN ~ -, Br ~ - have no interference.