Abstract：0.040 0 g of sample was transferred into crucible (which had been burned before) containing 0.3 g of vanadium pentoxide flux. Then, 0.2 g of tin particles was added followed by covering with 0.15 g of vanadium pentoxide flux and 1.4 g of tungsten particles. The calibration curves were prepared with potassium sulfate. Thus,a determination method of sulpfur with mass fraction of 5.00%-40.00% in copper concentrate was established by high frequency combustion infrared absorption method. The results showed that the calibration curves could be prepared with integral area as horizontal ordinate and absolute sulfur content as vertical coordinate. The linear equation of calibration curve was Y=37.02X－1.52 with linear correlation coefficient of R=0.999 8. The detection limit of method was 0.017%. The proposed method was applied to the determination of sulfur content in copper concentrate actual sample. The results were consistent with those obtained by gravimetric method or combustion-titration method. The certified reference material of copper concentrate was determined according to the experimental method, and the results were consistent with the certified values. The actual samples and certified reference material of copper concentrate were determined for six times. The relative standard deviations (RSD, n=6) were between 0.41% and 0.72%.
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