GB/T 13747.8-2017 Methods for chemical analysis of zirconium and zirconium alloys—Part 8:Determination of cobalt content—Nitroso-R-salt spectrophotometry (English Version)
2017GB/T 13747.8-2017 Methods for chemical analysis of zirconium and zirconium alloys—Part 8:Determination of cobalt content—Nitroso-R-salt spectrophotometry
1992GB/T 13747.8-1992 Zirconium and zirconium alloys--Determination of cobalt content--1-nitroso-2-hydroxy-3.6-naphthalene-disulfonic acid(sodium salt) spectrophotometric method