离子色谱法测定纯净水中F~-,BrO_3~-等6种阴离子

建立阴离子分离柱离子色谱法测定纯净水中F~-,BrO_3~-,Cl~-,NO_2~-,Br~-,NO_3~- 6种微量阴离子的方法。以SH-AC-1型阴离子柱为分离柱,柱箱温度为35℃,以1.0 mmol/L Na_2CO_3为淋洗液,流量为1.5 mL/min。F~-,BrO_3~-,Cl~-,NO_2~-,Br~-,NO_3~-的线性范围分别为20~320,40~800,40~640,10~200,50~1 000,50~1 000μg/L,线性相关系数均大于0.999,检出限为0.7~7.5μg/L,加标回收率在95.0%~106.3%之间,测定结果的相对标准偏差为1.41%~4.27%(n=5)。该方法测定结果准确、可靠,操作简便、快速,适用于纯净水中BrO_3~-,F~-,Cl~-,NO_2~-,Br~-,NO_3~- 6种阴离子的测定。

Determination of F-, BrO3-etc. 6 Kinds of Trace Anionsin in Pure Water by Ion Chromatography

Abstrac Anion separation column ion chromatography for determining 6 kinds of trace anions of F–,BrO3–,Cl–, NO2–,Br–,NO3–in pure water was established. SH–AC–1 type anionic column was used for separation and the column oven temperature was 35℃. 1.0 mmol/L Na2CO3 was used as the eluent with theflow rate of 1.5 mL/min. The linear range of F–,BrO3–,Cl–,NO2–,Br–,NO3– were 20–320,40–800,40–640,10–200,50–1 000, 50–1 000μg/L,respectively. The linear correlation coefficient was more than 0.999. The method detection limits were 0.7–7.5μg/L for 6 kinds of anions. The relative standard deviation of determination results was 1.41%–4.27%(n=5) and the standard addition recovery was 95.0%–106.3%. This method is simple to operate,and the result is accurate and reliable,so it is suitable for the determination of F–, BrO3–,Cl–,NO2–,Br–,NO3– in pure water.