摘要
以合成的双（N-乙基-N-苯基氨基二硫代甲酸）1，3-丙二醇酯为载体，采用双层膜电位法直接测定了溶剂聚合物膜中载体与金属离子的络合物生成常数．制备并考察了以双（N-乙基-N-苯基氨基二硫代甲酸）1，3-丙二醇酯为载体的银离子选择电极的性能．实验结果表明：该选择电极对银离子有良好的响应性能和高选择性，在10^-3～10^-6mol／L的浓度范围内响应斜率为56．0mV／paAg^＋，检测下限为3．7×10^-7mol／L，碱金属、碱土金属及过渡金属离子不干扰银的测定．该电极可作为测定维生素B1药片中维生素B1含量的电位滴定指示电极和水样中银离子含量的直接测定．
Trimethylene bis （N- ethyl- N- phenyldithiocarbamate） was used as the ionophore in solvent polymeric membrane. The ionophore-metal ion complex formation constants in solvent polymeric membrane were determined directly by potentiometry with a two-layer membrane electrode. A silver ion selective electrode was prepared and characterized with trimethylene bis （N-ethyl-N-phenyldithiocarbamate） as ionophore. The membrane electrode exhibited a good response to silver （I） with a slope of 56.0 mV/pa^,＋ in the concentration range 10^-3～10^-6 mol/L AgNO3 solution, and the detection limit is 3.7×10^-7 mol/L. The electrode has a highly selectivity for silver ion over alkali, alkaline earth and common transition metal ions. The electrode was used as the indicator electrode in titration of halide ions and Vitamin B1 in Vitamin B1 tablets with silver ion. The proposed electrode has also been used for the direct determination of silver ion in water sample.
出处
《河南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期111-114,共4页
Journal of Henan Normal University(Natural Science Edition)
基金
河南省教育厅自然科学基金(200510459014)
