GB/T 223.66-1989 Methods for chemical analysis of iron, steel and alloy—The thiocyanate chlorpromazine hydrochloride—chloro form extraction photometric method for the determination of tungsten content

GB/T 223.17-1989 Methods for chemical analysis of iron, steel and alloy The diantipyrylmethane photometric method for the determination of titanium content GB/T 223.19-1989 Methods for chemical analysis of iron, steel and alloy The neocuproine-chloroform extraction photometric method for the determination of copper content GB/T 223.26-1989 Methods for chemical analysis of iron, steel and alloy The thiocyanate direct photometric method for the determination of molybdenum content GB/T 223.28-1989 Methods for chemical analysis of iron, steel and alloy The α-benzoinoxime gravimetric method for the determination of molybdenum content GB/T 223.37-1989 Methods for chemical analysis of iron, steel and alloy The indophenol blue photometric method for the determination of nitrogen content after distillation separation GB/T 223.46-1989 Methods for chemical analysis of iron, steel and alloy—The flame atomic absorption spectrometric method for the determination of magnesium content GB 223.57-1989 The method of chemical analysis for steel and alloys: Extraction separation-adsorption catalytic polarography for the determination of cadmium GB/T 223.67-1989 Methods for chemical analysis of iron, steel and alloy—The reducing distillation-methylene blue photometric method for the determination of sulfur content GB/T 223.70-1989 Methods for chemical analysis of iron, steel and alloy—The o-phenanthroline spectrophotometric method for the determination of iron content