Abstract：The content of sulfur in ammonium polyvanadate rich in crystal water was determined by infrared carbon-sulfur analyzer with resistance furnace heating. Through the fluxing action of residue (V2O5) by sample decomposition, the content of sulfur in sample was directly determined. The results showed that a mass of H2O and NH3 generated due to the decomposition of ammonium polyvanadate had no influence on the determination of sulfur with sampling weight of 200 mg and combustion temperature of 1 370 ℃. It indicated that the calibration curve created by adding sulfur standard solution series into V2O5 was reliable. The proposed method has been applied to the determination of samples containing 0.08%-0.40% (mass fraction) of sulfur. The results were consistent with those obtained by barium sulfate gravimetric method with relative standard deviations (RSD, n=8) of 0.50%-1.4%.
