核燃料后处理过程钚产品液经草酸沉淀后,母液中存在的草酸影响钚的纯化工艺,需尽可能地将草酸除去。工艺中采用高锰酸钾破坏草酸,需要测定破坏后草酸的含量,因沉淀母液酸度高(3 mol/L),残留草酸的分析成为难题。采用离子色谱作为检测仪器,建立了简便、灵敏的测定草酸钚沉淀母液中微量草酸的新方法。样品稀释后,过H柱去除阳离子,然后用5 L/min After the reprocessing of plutonium in nuclear fuel, the oxalic acid present in the mother liquor affects the purification process of plutonium after the plutonium product solution is precipitated by oxalic acid, and the oxalic acid needs to be removed as much as possible. The process uses potassium permanganate to destroy oxalic acid, and the content of oxalic acid needs to be determined after destroying. Because of the high acidity (3 mol / L) of the mother liquor, the analysis of residual oxalic acid becomes a difficult problem. Using ion chromatography as a detection instrument, a simple and sensitive method for the determination of trace oxalic acid in the mother liquor of plutonium oxalate precipitation was established. After the sample was diluted, the H column was used to remove cations and then 5 L / min