摘要
研制了基于N，N’-双（2-水杨醛缩氨基苯基）1，3-丙二酸二酰胺合铜（Ⅱ）ECu（Ⅱ）-BSAPM]为中性载体的阴离子选择性电极．实验表明，以ECu（Ⅱ）-BSAPM]为中性载体的电极对硫氰酸根（SCN-）具有良好的电位响应特性，且呈现反Hofmeister行为，其选择性序列从大到小为：SCN，Sal，I^-，ClO4^-，NO3^-，Br^，NO2^-，Cr，SO3^2-，SO4^2-．在pH=4．0的磷酸盐缓冲体系中，电板电位呈现近能斯特响应，线性响应范围为1．0×10^-6～1．0×10mol／L，斜率为～55．9mV／dec（25℃），检测下限为8．0×10^-7mol／L．采用交流阻抗技术及紫外可见光谱技术研究了电极的响应机理，并将该电极用于实验室废水中SCN^-检测，其结果令人满意．
A new PVC membrane electrode based on N, N＇-bis （2-salicylaldehyde-amino phenyl） malondiamide eopper （Ⅱ） ]-Cu（Ⅱ）-BSAPM] as neutral carrier is described. The results show that the electrode based on [-Cu（Ⅱ）-BSAPM] displays an excellent potentiometric response to thiocyanate ion and an anti-Hofmeister selectivity sequence in the following order： SCN^- , Sal^- , I^- , ClO4^- , NO3^- , Br^- , NO2^- , Cl^- , SO3^2- ,SO4^2-. The electrode exhibits near Nernstian potential linear range of 1.0 × 10^-6 - 1.0 × 10^-1 mol/L with a detection limit of 8.0× 10^-7 mol/L and a slope of -55.9 mV/dec in pH=4.0 phosphorate buffer solution at 25℃. The response mechanism is discussed in view of the A. C. impedance technique and the UV spectroscopy. Applied to wastewater analysis in laboratory, the electrode gave satisfactory results.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第11期49-52,共4页
Journal of Southwest University(Natural Science Edition)
