固定污染源硝酸雾中硝酸根的检测

建立了固定污染源硝酸雾中硝酸根的检测方法。用硅胶管采集固定污染源硝酸雾中的硝酸,用碳酸钠溶液进行洗脱,最后使用离子色谱仪测定硝酸根质量浓度。对影响检测结果的加热时间和静置时间进行了研究。实验结果表明:最佳的加热时间为10 min,无需静置;方法的相对标准偏差为0.27%~0.62%,检出限为0.002 5μg/m L,加标回收率为99.7%~102.2%。该法线性关系良好,检出限低,精密度高,能满足固定污染源硝酸雾中硝酸根的测定要求。

Determination of Nitrite in Nitric Acid Fog from Stationary Source Emission

The method for determination of nitrite in nitric acid fog from stationary source emission was established. Nitric acid was collected from the nitric acid fog using a silicon tube,and then was eluted with sodium carbonate solution,in the end was detected by ion chromatography. The effects of heating time and standing time on determination were studied. The experimental results show that：The best heating time is 10 min and the standing time is 0;The relative standard deviation of the method is 0.27%-0.62%,the detection limit is 0.002 5 μg/mL,the recovery of standard addition is 99.7%-102.2%. This method can meet the requirement for determination of nitrite in nitric acid fog from stationary source emission with good linearity,low detection limit and high precision.