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近年来,化学修饰电极用于化学分析的工作日益增多。它具有很高的灵敏度和选择性。Koster等提出用螯合树脂选择性分离贵金属与贱金属元素,在赘合树脂中,含有结构,其特点是对贵金属有良好的选择性,而贱金属如铜、铁和锌等则可自由通过交换柱。目前已将这种树脂制成离子交换纸和离子交换膜,但其合成方法是一项专利。最近我们首次以腈纶为原料与硫氰酸铵反应制得类似上述结构的聚丙烯脒硫氰酸盐纤维,并证明对贵金属有良好的选择性。将聚丙烯脒硫氰酸盐修饰到石墨电极上,制成聚丙烯脒硫氰酸盐修饰电极,并成功地用于金的分析。
In recent years, the use of chemically modified electrodes for chemical analysis has been increasing. It has high sensitivity and selectivity. Koster et al. Propose the selective separation of precious metals and base metal elements from chelating resins, which contain structures in the conglomerate resin and are characterized by good selectivity to noble metals such as copper, iron and zinc Exchange column. This resin has been made into ion exchange paper and ion exchange membranes, but its synthesis is a patent. Recently, we first used acrylic as raw material to react with ammonium thiocyanate to obtain polyacrylamide thiocyanate fiber with the above structure and proved that it has good selectivity to precious metal. Polyacrylamide thiocyanate was modified to graphite electrode to make polyacrylamide thiocyanate modified electrode and successfully used in gold analysis.