2008HB 5220.8-2008 Methods for chemical analysis of superalloys.Part 8: Determination of phosphorus content by n-butyl alcohol-chloroform extraction photometric method
1970HB 5220.8-1995 Chemical Analysis Methods of Superalloys-N-Butanol-Chloroform Extraction-Absorptiometry for Determination of Phosphorus Content
1970HB 5220.8-1982 Determination of vanadium content in superalloy