摘要
研究了双核三苄基甲醇锡(Ⅳ)哌嗪荒酸酯配合物[Sn(Ⅳ)-BTMTP]为中性载体的PVC膜阴离子选择性电极。这类电极对硫氰酸根离子呈现出优良的电位响应性能和选择性,并呈现出反Hofmeister选择性行为。其选择性序列为:SCN-〉I-〉ClO4-〉NO2-〉NO3-〉Cl-〉SO42-〉AC-,该电极在pH=4.0的磷酸盐缓冲体系中对SCN-呈超能斯特响应,响应范围为1.0×10-1~3.2×10-5 mol/L,斜率为-72.4 mV/dec,检出限为1.28×10-5mol/L。采用交流阻抗及紫外光谱研究了阴离子与载体的作用机理。将该电极用于废水分析,结果令人满意。
A new binuclear tin(Ⅵ) complex(bis-tribenzyl-methoxide-tin piperazinylbisdithio carbamate) as neutral carrier for selective thiocyanate PVC membrane electrode was made.It displays an anti-Hofmeister selectivity se-quence:SCN- I- ClO4-NO2- NO3- Cl- SO42- AC-.The electrode exhibits Supper-Nernstian for SCN-over a wide concentration range(1.0×10-1 ~ 3.2×10-5 mol/L) with a detection limit 1.28×10-5 mol/L and a slope of-72.4 mV/dec in pH4.0 of phosphorate buffer solution at 25 ℃.The response mechanism is discussed in view of the AC impedance technique and the UV spectroscopy technique.The electrode was successfully applied to the disposal of SCN-in effluent.
出处
《化学传感器》
CAS
2010年第2期63-66,共4页
Chemical Sensors