Abstract：There are various kinds of mineral products, meanwhile, the range of sulfur content is wide.The calibration curve was prepared with potassium sulfate. The determination method of sulfur content in mineral products by high frequency combustion infrared absorption was established. The optimal experimental conditions were obtained as below: the sample mass was 0.1 g when the mass fraction of sulfur was less than 10%; the samplemass was 0.05 g when the mass fraction of sulfur was in range of 10%-20%; the sample mass was 0.025 g when the mass fraction of sulfur was in range of 20%-40%; when the sulfur content in sample was in range of 40%-55%, the sample was diluted by about 8 times using high-purity silicon dioxide powder, and then the sample mass was 0.1 g for determination. The sample addition was described as follows: the sample was transferred into porcelain crucible containing 0.2 g of tin particles followed by covering with 0.5 g of pure iron and 1.6 g of tungsten particles. The results indicated that the linear correlation coefficient of calibration curve was higher than 0.99. The mass of sulfur in range of 0.004 8-11.0 mg showed good linearity to the absorption peak area. For the sample with sulfur content lower than 0.05%, the influence of reagent blank should be deducted during calculation. For the sample with sulfur content higher than 0.05%, the reagent blank (including the condition using high-purity silicon dioxide powder) could be ignored. The proposed method was applied to the analysis of standard mineral samples with different sulfur contents in range of 0.01%-53%. The found results were basically consistent with the certified values. The relative standard deviations (RSD, n=5)were less than 2.6%, and the recoveries were between 97% and 120%.
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