GB/T 4698.6-1984 Methods for chemical analysis of titanium and titanium alloys--The extraction-methylene blue photometric method for the determination of boron content
2019GB/T 4698.6-2019 Methods for chemical analysis of titanium sponge,titanium and titanium alloys—Part 6:Determination of boron content—Methylene blue spectrophotometry and inductively coupled plasma atomic emission spectrometry
1996GB/T 4698.6-1996 Sponge titanium, titanium and titanium alloys--Determination of boron content--Extraction--methylene blue spectrophotometric method
1984GB/T 4698.6-1984 Methods for chemical analysis of titanium and titanium alloys--The extraction-methylene blue photometric method for the determination of boron content