Ion Chromatography Analysis Method of Trace Oxalic Acid in High Concentration Nitric Acid Solution

A technology of nitric acid solution and ion chromatography, which is applied in the field of ion chromatography analysis of trace oxalic acid in high-concentration nitric acid solution, can solve the problems of poor practical application effect, influence, and inability to accurately analyze the concentration of oxalic acid, so as to achieve accurate determination of oxalic acid concentration, eliminate Affects and improves the separation effect

Active Publication Date: 2014-07-02
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

Experiments have shown that this eluent system cannot achieve complete separation between high-concentration nitric acid and trace amounts of oxalic acid, and the actual application effect is not good.
For the destroyed precipitation mother liquor contains ~10-4mol/L oxalic acid and 2-3mol/L nitric acid

Method used

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  • Ion Chromatography Analysis Method of Trace Oxalic Acid in High Concentration Nitric Acid Solution

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Abstract

The invention belongs to the technical field of post-processing of nuclear fuel, and in particular relates to an ion chromatography analysis method for trace amounts of oxalic acid in a high-concentration nitric acid solution. Instrument detection and analysis, wherein, before the above-mentioned washing step, solid NaHCO3 is used to pretreat the destroyed plutonium (IV) oxalate precipitation mother liquor, so that the pH value is 6 to 8; the composition of the eluent system is: Na2CO3, NaHCO3 and H3BO3, wherein the concentration of Na2CO3 is 2-10mmol/L, the concentration of NaHCO3 is 2-10mmol/L, and the concentration of H3BO3 is 2-10mmol/L. The ion chromatography analysis method can accurately analyze trace amounts of oxalic acid in high-concentration nitric acid solution.

Description

Ion Chromatography Analysis Method of Trace Oxalic Acid in High Concentration Nitric Acid Solution technical field The invention belongs to the technical field of post-treatment of nuclear fuel, and in particular relates to an ion chromatographic analysis method for trace amounts of oxalic acid in a high-concentration nitric acid solution. Background technique Many reprocessing plants in the world today mostly use oxalic acid precipitation to convert plutonium nitrate solution into solid plutonium dioxide that is more conducive to preservation. In order to make the conversion rate of plutonium as high as possible, the amount of oxalic acid is about 10g / L (0.1mol / L) in excess of oxalic acid in the feed solution on the basis of satisfying the stoichiometric ratio of plutonium nitrate precipitation. The washing liquid produced in the precipitation process is combined with the filtrate to form the plutonium(IV) oxalate precipitation mother liquor. Since the precipitation moth...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/02
Inventor 杨贺叶国安罗方祥肖松涛刘协春兰天
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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