Abstract：Steel slag was an important component of concrete, and the content of fluorine and chlorine in steel slag had a greater impact on concrete safety. The contents of fluoride and chlorine in steel slag were determined by ion chromatography coupled with on-line combustion. 70-90 mg of sample was treated by pyrolysis at 1 100 ℃. Fluoride and chlorine in the sample was converted into the form of gas and absorbed with 10 mL of 15 mmol/L NaOH solution. Then, the contents of fluoride and chlorine in absorbent were determined by ion chromatography. The results showed that the mass concentration of fluoride and chlorine in range of 0-10 mg/L was linear to the corresponding peak area. The linear correlation coefficients of calibration curves were both higher than 0.999. The detection limits of fluorine and chlorine in proposed method were 0.014 9 mg/kg and 0.037 3 mg/kg, respectively. Fluoride and chlorine in steel slag were determined according to the experimental method. The relative standard deviations (RSDs, n=6) of determination results were all less than 3.0%, and the recoveries were between 95% and 98%. The proposed method could provide technical support for steel slag and other solid wastes. It could effectively solve the problems of complicated operation and poor repeatability during the determination of fluorine and chlorine content in steel slag and other solid wastes. In addition, this method was applicable for the determination of fluorine and chlorine in solid wastes such as steel slag.
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