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在乏燃料后处理工艺中,亚硝酸钠主要用于料液中Np、Pu的调价控制,因此亚硝酸钠含量的分析十分重要。目前采用的方法是在酸性条件下,高锰酸钾氧化亚硝酸钠,过量高锰酸钾再用碘化钾还原,淀粉做指示剂,硫代硫酸钠反滴定的方法,此方法耗时长,消耗大量的标准试剂。因此,建立简单、快速的亚硝酸钠分析方法,对于后处理工艺的控制分析是十分必要的。本工作建立了近红外光谱法快速测定后处理工艺中亚硝酸钠含量的方法。运用样品的中波近红
In the spent fuel reprocessing process, sodium nitrite is mainly used for price control of Np and Pu in feedstock, so the analysis of sodium nitrite content is very important. The method currently used is to oxidize sodium nitrite by potassium permanganate, excess potassium permanganate and then reduce with potassium iodide, starch as an indicator, and back-titration with sodium thiosulfate under acidic conditions. This method takes a long time and consumes a large amount of Standard reagent. Therefore, to establish a simple and rapid analytical method of sodium nitrite is very necessary for the control analysis of the aftertreatment process. This work established a method of rapid determination of sodium nitrite content in the post-treatment process by near infrared spectroscopy. The use of the sample near-red wave