离子色谱法测定纯净水中痕量亚硝酸根

Determination of trace nitrite in pure water samples by ion chromatography

目的:用离子色谱法测定纯净水中的痕量亚硝酸根.方法:含亚硝酸根离子的水样中加入一定量的甲醛,用离子色谱法测定,峰面积进行定量.结果:加入 1.0 mg/L 甲醛,可延长亚硝酸盐的稳定时间,改善分析性能,方法的检出限为 0.01 mg/L,线性范围为 0～30 mg/L,线性相关系数r=0.9998,方法精密度(RSD)和准确度(P),分别为 1.93%～3.70% 和 96.08%～104.06%.结论:该方法准确度高、精密度好,简便、快速,可直接测定水样中的亚硝酸根,结果满意.

Objective：To determine nitrite in pure water samples by ion chromatography. Methods：The water samples which contained nitrite was added into formaldehyde, it was detected by ion chromatography and quantified by peak area. Results： The formaldehyde was not interfere with the peak of nitrite. The eluent was 1.7 mmol/L sodium bicarbonate and 1.8 mmol/L sodium carbonate. When the eluent flow rate was 0. 8 ml/min, it was 8 hours that the longest stable time of the nitrite in the mixed solution, the linear range of the calibration curve was 0 - 30 mg/L with the detection limit of 0. 01 mg/L and the correlation coefficient was 0. 9998. The precision （ RSD ） was 1.93 % - 3.70% , and accuracy （ P ） 96.08 % - 104.06%. Conclusion： This method is reliable and accurate and can be used to detect nitrite directly in water.