Standard substance for sulfur content determination, produced by the Institute of Petrochemical Science. Used for calibrating the sulfur content standard samples of WKL-100 microcoulometry sulfur chlorine analyzer and TS-100 ultraviolet fluorescence sulfur analyzer to determine the sulfur content in petrochemical products. The following concentrations of light oil can be selected: 0.2, 0.5, 1, 3, 5, 10, 20, 30, 50, 100, 200, 300, 500, 700, 700, 1000, 1500, 2000, 3000, (mg/L)； The following concentrations of heavy oil can be selected: 5, 10, 50, 100, 300, 500 (ppm), 0.10%, 0.2%, 0.3%, 0.4%, and 0.50%; 【 Storage conditions 】 Keep cool and away from light