GB/T 8151.4-1987 Methods for chemical analysis of zinc concentrates--The molybdenum blue spectrophotometric method for the determination of silica content (English Version)
2012GB/T 8151.4-2012 Methods for chemical analysis of zinc concentrates.Part 4:Determination of silicon dioxide content.Molybdenum blue spectrophotometry
2000GB/T 8151.4-2000 Methods for chemical analysis of zinc concentrates -Determination of silicon dioxide content
1987GB/T 8151.4-1987 Methods for chemical analysis of zinc concentrates--The molybdenum blue spectrophotometric method for the determination of silica content