GB/T 6150.4-2023 Methods of chemical analysis of tungsten concentrates-Part 4: Determination of sulfur content by high-frequency induction infrared absorption method and combustion-iodometric method (English Version)
2023GB/T 6150.4-2023 Methods of chemical analysis of tungsten concentrates-Part 4: Determination of sulfur content by high-frequency induction infrared absorption method and combustion-iodometric method
2009GB/T 6150.3-2009 Methods for chemical analysis of tungsten concentrates-Determination of phosphotus content-The phosphorus molybdenum yellow spectrophotometry
2008GB/T 6150.4-2008 Methods for chemical analysis of tungsten concentrates.Determination of sulfur content .The high frequency-infrared absorption method
1985GB/T 6150.4-1985 Methods for chemical analysis of tungsten concentrates--The molybdenum yellow photometric method for the determination of phosphorus content