GB/T 1819.11-2017 Methods for chemical analysis of tin concentrates—Part 11:Determination of aluminium oxide content—Chromazuzal S spectrophotometric method (English Version)
2017GB/T 1819.11-2017 Methods for chemical analysis of tin concentrates—Part 11:Determination of aluminium oxide content—Chromazuzal S spectrophotometric method
2004GB/T 1819.11-2004 Methods for chemical analysis of tin concentrates Determination of aluminum oxide content-The chromazuzol S spectrophotometric method
1979GB/T 1830-1979 Determination of aluminium oxide content in tin concentrates--Chromazurol S photometric method