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饱和食盐水经调节酸度后直接注入流动注射仪进样阀中,以NaOH溶液作载流载入离子交换柱中分离富集其中的Ca~(2+)、Mg~(2+),用HCl溶液洗脱并载入火焰原子化器中进行原子化,从而实现了微量金属离子的连续分离和测定,避免了繁琐的手工操作,消除了大量NaCl的干扰,方法简便快速。用于精制饱和食盐水中微量Ca~(2+)、Mg~(2+)的测定,结果表明,变异系数分别为2.3％和5.9％(n=8),平均回收率分别为101.5％和99.8％,检测限分别为42ppb和4.8ppb。
The saturated saline solution is directly injected into the injection valve of the flow injection syringe after adjusting the acidity, and loaded into an ion exchange column with NaOH solution for separation and enrichment of Ca2 +, Mg2 + The solution elutes and is loaded into a flame atomizer for atomization, thereby realizing the continuous separation and determination of trace metal ions, avoiding the cumbersome manual operation and eliminating the interference of a large amount of NaCl, and the method is simple and rapid. The results showed that the coefficients of variation were 2.3% and 5.9%, respectively (n = 8). The average recoveries were 101.5% and 99.8%, respectively %, The detection limits were 42ppb and 4.8ppb respectively.