GB/T 6150.1-2023 Methods for chemical analysis of tungsten concentrates Part 1: Determination of tungsten trioxide content Ammonium tungstate ignition gravimetric method (English Version)
2023GB/T 6150.1-2023 Methods for chemical analysis of tungsten concentrates Part 1: Determination of tungsten trioxide content Ammonium tungstate ignition gravimetric method
2008GB/T 6150.1-2008 Methods for chemical analysis of tungsten concentrates.Determination of tungsten trioxide content.The ammonium tungstate igniting gravimetric method
1985GB/T 6150.1-1985 Methods for chemical analysis of tungsten concentrates--The ammonium tungstate igniting gravimetric method for the determination of tungsten trioxide content