流动注射离子选择电极法自动测定阳离子交换树脂交换容量的研究

基于流动注射离子选择电极法(FIA-ISE)测定痕量Na 原理,建立了一种能自动测定阳离子交换树脂各种交换性能的方法,对影响阳阳离子交换树脂交换容量的各种因素进行考察,筛选出凝胶型强阳离子交换树脂(SACR)交换性能测定的最佳条件:微型交换柱内径3.0mm、长80mm;树脂填充量0.1951g;再生剂HCl浓度为3.0%,其流速为0.90mL/min(7.64m/h),再生剂耗量350mL/g(干树脂);样品为20mg/LNa 溶液,其流速为1.50mL/min;实现了一次测定同时获得SACR的工作交换容量、平衡交换容量、全交换容量、交换速率和树脂利用率。与ASTM法进行对照实验,其结果相关性良好(r=0.9922)。

Determination Method for Exchange Capacity of Cation Exchange Resins Based on Flow Injection-Ion Selected Electrode

On the basis of determining trace sodium ion with FIA-ISE,a new determination method has been developed for the exchange performance of stronge acidic cation resin.During the research on factors which effect exchange performance of cation ion exchange resins,optimum conditions were obtained.The inner diameter and length of the mini-exchange column are 3.0 mm and 80 mm,respectively;the dosage of the resins is 0.1951 g.The concentration of the regeneration is 3.0% HCl,and its flow rate is 0.90 mL/min.The sample is 20 mg/L NaOH solution,its flow rate is 1.50 mL/min.The correlation between FIA and ASTM data is excellent(r=0.9922).This method can be used to determine the exchange performance(breakthrough capacity,equilibrium exchange capacity,total exchange capacity,exchange rate,using rate,etc)of the strongly-acidic cation exchange resins.