Objective A method for the determination of fluoride ion in coalmine water was established by ion chromatography.Methods The water samples were determined by 0.22 μm qeuosystem filter membrane with a volume of 25 μL.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.
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