【摘要】 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。更多还原

【Abstract】 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.更多还原