This standard describes methods for the determination of silica content in tungsten concentrates, including the Silicon Molybdenum Blue Spectrophotometric method, spectra-trophotometry and weighting method. Silicon Molybdenum Blue Spectrophotometric method, spectra-trophotometry is suitable for the determination range of 0.50% to 10.00%, while the weighting method is suitable for the range of 3.00% to 10.00%. The Silicon Molybdenum Blue method uses spectrophotometer measurement of the Absorbance of Silicon Molybdenum Blue to determine the silica content. The standard also specifies the application range of the method and the arbitration method of the overlapping part, which ensures the accuracy and Reliability of the analysis.