【摘要】 提出了以TPPS₄为柱后色谱衍生试剂的同时测定微量汞、镉和锌的离子色谱分析法,研究了影响衍生反应速度的因素。在含氯化钠的pH 10.3～12的硼酸钠缓冲介质中,以PAR催化TPPS₄与待测金属离子反应,以硅质键合相阳离子交换剂为固定相、酒石酸—氯化钠为流动相,于10min左右定量分离金属离子并将镉的淋洗顺序调至锌前。用于废水、硅酸盐和大米分析,结果满意。更多还原

【Abstract】 An ion chromatographic methodising porphyrin TPPS4 as post-chromatographic derivatiza-tion agent has been developed for simultaneously determining trace amounts of Hg, Cd, Zn. The factors affecting the derivatization reaction rate were investigated. A detection system consisting of TPPS4 with PAR as accelerating agent of derivatization in the buffer of Na2B<O7-NaOH(pH 10. 3-12) containing NaCl was proposed. A separation system with sillica gel chemically bonded cation exchanger as stationary phase and the tartaric acid-NaCl as mobile phase was selected for separation of these metal ions. The separation can be finished in 10 min and the elution order can be adjusted from Zn-Cd to Cd-Zn. This method was applied to the analysis of waste water, sillicate and the corn with satisfactory results.更多还原