离子色谱法测定煤矿水中氟离子含量

Determination of coalmine water fluoride by ion chromatograpy

目的建立了离子色谱法测定煤矿水中的氟离子含量的方法。方法水样经0.22μm水系滤膜过滤后进样,进样体积为25μL,采用HS-5A-P3阴离子交换柱、淋洗液流速1.0 mL/min、淋洗液浓度C(KOH)20 mmol/L、柱温35℃等条件下电导检测器在4 min内完成氟离子的测定。结果氟离子浓度在0.00-20.0 mg/L范围内,与峰面积线性关系良好,线性回归方程为:y=30.26x-0.104;该标准曲线的相关系数为0.9997,方法检出限为0.002 mg/L,加标回收率为88.0%-115.5%。采用该方法测定标准样品中氟离子含量的均值在其浓度保证值范围内。结论对比离子选择电极法,该方法具有样品用量少、能同时测定其他几种组分等优点,适合大批量煤矿水中氟离子含量的测定。

Objective A method for the determination of fluoride ion in coalmine water was established by ion chromatography.Methods The water samples were determined by 0.22μm qeuosystem filter membrane with a volume of 25μL.In ion chromatograpy,the determination of fluoride was completed within 4 min under the anion exchange chromatography of HS-5A-P3 with column temperature at 35℃,eluted with 20 mmol/L KOH solution at the rate of 1.0 mL/min.Results The linear relation between peak area and concentration of fluoride were good.The linear return equation was y=30.26x-0.104.The correlation coefficient of the standard curve was above 0.9997.The detection limit was 0.002 mg/L.The recovery of fluoride was 88.0%-115.5%.The mean value of fluorine ion content in the standard sample was within the range of its guaranteed concentration.Conclusion Compared fluoride ion selective electrode method,the method has the advantages of small sample amount and can be used to determine other components simultaneously.It is suitable for the determination of fluorine ion content in large quantities of coal mine water.