采用紫外分光光度法测定混合溶液中NO-3和SO2-4的浓度。结果表明，在NO-3浓度为2~10 mg·L-1、SO2-4浓度为10~100 mg·L-1时，离子浓度与吸光度呈良好的线性关系；混合溶液中NO-2和SO2-3的浓度较低，对测定结果的干扰可以忽略。该方法具有操作简单、准确度高、重现性好等优点，能够满足工业生产对混合溶液中NO-3和SO2-4浓度测定的要求。“,”The concentrations of NO-3 and SO2-4 in a mixed solution were measured by UV spectrophotometry. Results showed that,when the concentration of NO-3 was from 2 mg·L-1 to 10 mg·L-1 and the concentration of SO2-4 was from 10 mg·L-1 to 100 mg·L-1 ,there was a good linear relationship between the concentration and the absorbance. If the concentrations of NO-2 and SO2-3 in the mixed solution was low,their interference on the measurement results could be ig-nored. This method has advantages of simple operation,high accuracy,good reproducibility,which meets the requirements for measurement of NO-3 and SO2-4 concentrations in a mixed solution from industrial production.