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建立了电导检测–离子色谱法同时测定生活饮用水中F–,Cl–,SO42–,NO3–的方法。选择30 mmol/L Na OH溶液为淋洗液,流量为1.40 m L/min,检测器电流为106 m A。F–的线性范围为0.15~2.0 mg/L,Cl–,SO42–,NO3–的线性范围为3.00~40.0 mg/L,4种离子的线性相关系数均大于0.999 5。F–,Cl–,SO42–,NO3–的方法检出限分别为0.02,0.13,0.14,0.02 mg/L,加标回收率在95.2%~103.0%之间。对环境标准204715进行了平行测试,各阴离子测定值均在标准值的不确定度范围内,测定结果的相对标准偏差小于2%(n=6)。该方法灵敏、准确、快速,可用于生活饮用水中F–,Cl–,SO42–,NO3–的同时测定。
A method for simultaneous determination of F-, Cl-, SO42- and NO3- in drinking water by conductivity detection-ion chromatography was established. A 30 mmol / L NaOH solution was selected as the eluent with a flow rate of 1.40 m L / min and a detector current of 106 mA. The linear range of F- was 0.15-2.0 mg / L, the linear range of Cl-, SO42- and NO3- was 3.00-40.0 mg / L, and the linear correlation coefficients of all four ions were all greater than 0.999 5. The detection limits of F-, Cl-, SO42- and NO3- were 0.02, 0.13, 0.14 and 0.02 mg / L, respectively. The spiked recoveries ranged from 95.2% to 103.0%. The environmental standard 204715 was tested in parallel. The measured values of anions were all within the range of the standard values. The relative standard deviation of the results was less than 2% (n = 6). The method is sensitive, accurate and rapid and can be used for the simultaneous determination of F-, Cl-, SO42- and NO3- in drinking water.