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首先用碱熔融法分解试样，然后加抗坏血酸将试液中的Ｆｅ３＋还原为Ｆｅ２＋，再用离子色谱法测定试液中的Ｆｅ２＋，Ｍｇ２＋和Ｃａ２＋。采用Ｓｈｉｍ－ｐａｃｋＩＣ－Ｃｌ阳离子交换柱分离样品离子，以０．２５ｍｍｏｌ／Ｌ乙二胺－０．５０ｍｍｏｌ／Ｌ柠檬酸（ｐＨ４．５０）为流动相，以ＣＤＤ－６Ａ电导检测器检测，使被测组分得到满意的分离和检测。Ｆｅ，Ｍｇ和Ｃａ的加标回收率均在９０％以上。测定结果与原子吸收光谱法测定结果相近。
Firstly, the sample is decomposed by the alkali melting method, then the ascorbic acid is added to reduce the Fe3 + in the test solution to Fe2 +, and then the Fe2 +, Mg2 + and Ca2 + in the test solution are determined by ion chromatography. The sample ions were separated on a Shim-pack IC-Cl cation exchange column and eluted with 0.25 mmol / L ethylenediamine-0.50 mmol / L citric acid (pH 4.50) as mobile phase and CDD-6A conductivity detector Test components were satisfactorily separated and tested. The spiked recoveries of Fe, Mg and Ca were over 90%. The results are similar to the results of atomic absorption spectrometry.