Determination of fluorine and chlorine in chrome ore by high temperature combustion hydrolysis in ion chromatography

In this research, on-line ion chromatography with high temperature combustion hydrolysis electric eluent, which determines the fluorine and chlorine in chromium ores, was proposed. The optimum technological conditions tested by experiments are: he linear correlation coefficient of the standard curve among sample weight, hydrolysis time and temperature, oxygen flow rate, ion chromatography conditions is bigger than 0.999. The experimental results show that the average recovery ranges from 96% to 105% for the three added concentrations of fluorine and chlorine (20, 50, 100 μg/kg). And the relative standard deviation is less than 4.30%. The detection limit can reach 20 μg /kg.