Ion Chromatography is an analytical method that has developed rapidly in recent years,it has the advantages of high sensitivity,fast analysis speed,good selectivity,less sample amount,simultaneous analysis and determination of multi-component and different valence compounds,and easy to realize automation.Ion chromatography is mainly used to study inorganic anions and cations.A method for the determination of nitrate in dimethyl oxalate by ion chromatography was developed.In this method,the sample was pretreated by hydrolysis and oxidation of dimethyl oxalate to eliminate the interference of the complex matrix of the sample and the hydrolysis of the sample to oxalate to the determination of nitrate,using 4.5 mmol Na2 CO3+0.8 mmol NaHCO3 as eluent,the ion chromatogram not only separated well,but also completed the analysis in 16 minutes.The linear equation y = 0.103 6x-0.289 6,R2 = 0.999 1 in the range of 6.25～100 mg/L nitrate concentration,and the RSD of actual sample nitrate content was 1.527 8%(n= 4),it can meet the requirement of timeliness and accuracy of chemical production control analysis.
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