GB/T 4324.13-2008 Methods of chemical analysis of tungsten Determination of calcium content Inductively coupled plasma atomic emission spectrometry (English Version)
2008GB/T 4324.13-2008 Methods of chemical analysis of tungsten Determination of calcium content Inductively coupled plasma atomic emission spectrometry
1984GB/T 4324.13-1984 Methods for chemical analysis of tungsten--The glyoxal bis(2-hydroxyanil)photometric method for the determination of calcium content