摘要
首次研究以二醋酸双(呋喃甲醛)缩1,3-丙二胺汞(Ⅱ)配合物为载体的PVC膜电极。该电极对碘离子呈现出优良的电位响应特性并呈现反Hofmeister行为,电极在pH2.0的磷酸盐缓冲体系中,对I^-在10×10^(-4)～5.0×10^(-7)mol/L浓度范围内呈近能斯特响应,电极响应斜率为64.7mV/dec(20℃),检测下限为2.0×10^(-7)mol/L。采用交流阻抗技术和紫外可见光谱分析技术研究了电极的响应机理,结果表明配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系。将该电极用于实际样品分析,所得结果令人满意。
A new highly sensitive and highly selective iodide electrode with N, N' - bis -(furaldhyde)-1,3-diaminopropane mercury(Ⅱ) complex [Hg(Ⅱ) -BFADP] as the neutral carrier is described which displays an anti - Hofmeister selectivity sequence: I- > Sal- > SCN-> ClO4-> Br- > Cl- > NO2-> NO3- > SO32- > SO42-. The excellent selectivity for iodide is related to the unique interaction between the central Hg(II) and iodide. The response mechanism of the electrode is also studied with the A.C.impedance,and UV spectroscopy techniques. The electrode exhibits near - Nernstian potential linear response range to iodide from 1.0×10-4 to 5. 0×10 7 mol/L with a detection limit of 2.0×10-7 mol/L and a slope of 64. 7 mV/dec in pH2. 0 of phosphorate buffer solution at 20℃. The eleclrode can be applied to sample analysis and the result is fair agreement with the result given by HPLC methods.
出处
《化学传感器》
CAS
2003年第4期23-28,共6页
Chemical Sensors
基金
教育部优秀青年教师计划基金(教人司(2002)40)
重庆市自然科学基金(2002-7477)
