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提出了离子色谱法测定重铬酸钠中微量Cl-和SO2-4的检测方法,采用碱溶液将试液中六价铬(CrⅥ)还原成三价铬(CrⅢ),采用化学沉淀法将Cr(OH)3沉淀并分离,使用IonPacAS17作为色谱柱,淋洗液自动发生-离子色谱梯度分离,实现了重铬酸钠中Cl-和SO2-4的同时测定。Cl-的回收率在96.4%～101.5%,SO2-4的回收率在96.3%～102.6%。该方法重现性好,灵敏度高,消除了重铬酸钠中大量铬酸根离子的干扰和对色谱柱的污染,适合重铬酸钠中微量Cl-和SO2-4的检测。
A method for the determination of trace Cl- and SO2-4 in sodium dichromate by ion chromatography was proposed. The hexavalent chromium (CrVI) in the test solution was reduced to CrIII by alkali solution, and Cr (OH) 3 precipitation and separation, the use of IonPacAS17 as the column, the eluent occurred automatically - ion chromatography gradient separation to achieve the sodium dichromate Cl- and SO2-4 simultaneous determination. The recoveries of Cl- ranged from 96.4% to 101.5% and SO2-4 recovered from 96.3% to 102.6%. The method has good reproducibility and high sensitivity, which can eliminate the interference of a large amount of chromate ions in the sodium dichromate and the pollution of the chromatographic column, and is suitable for the detection of trace Cl- and SO2-4 in sodium dichromate.