SJ 20143-1992 Specification for tungsten wires for electron devices

GB 228-1987 GB 4181-1984 GB/T 4324.1-1984 Methods for chemical analysis of tungsten--The square wave polarographic method for the successive determination of lead and cadmium contents GB/T 4324.2-1984 Methods for chemical analysis of tungsten--The potassium iodide-brucine photometric method for thedetermination of bismuth content GB/T 4324.3-1984 Methods forchemical analysis of tungsten--The polyethylene glycol octyl phenylether-phenylfluorone photometric method for the determination of tin content GB/T 4324.4-1984 Methods for chemical analysis of tungsten--The malachite green photometric method for the determination of antimony content GB/T 4324.5-1984 Methods for chemical analysis of tungsten--The molybdenum blue photometric method for the determination of arsenic content GB/T 4324.6-1984 Methods for chemical analysisof tungsten--The ortho-phenanthroline photometric method for the determination iron content GB/T 4324.7-1984 Methods for chemical analysis of tungsten--The 5-Cl-PADAB photometric method for the determination of cobalt content GB 4324.1～4324.30-1984 GB 4324.1～4324.30-1984 GB/T 4324.10-1984 Methods for chemical analysis of tungsten--The neocuproine photometric method for the determination of copper content GB/T 4324.11-1984 Methods for chemical analysis oftungsten--The chromazurol S photometric method for the determination of aluminium content GB/T 4324.12-1984 Methods for chemical analysisof tungsten--The chlorization-molybdenum blue photometric method for the determination of silicon content GB 4324.1～4324.30-1984 GB 4324.1～4324.30-1984 GB 4324.1～4324.30-1984 GB 4324.1～4324.30-1984 GB/T 4324.17-1984 Methods for chemical analysis of tungsten--The atomic absorption spectrophotometric method for the determination of sodium content GB/T 4324.18-1984 Methods for chemical analysis of tungsten--The atomic absorption spectrophotometric method for the determination of potassium content GB/T 4324.19-1984 Methods for chemical analysis of tungsten--The diantipyrylmethane photometric method for the determination of titanium content GB/T 4324.20-1984 Methods for chemical analysis of tungsten—The N-benzoyl-N-phenylhydroxylamine photometric method for the determination of vanadium content GB/T 4324.21-1984 Methods for chemical analysis of tungsten--The diphenylcarbazide photometric method for the determination of chromium content GB/T 4324.22-1984 Methods for chemical analysisof tungsten--The formaldoxime photometric method for manganese content GB/T 4324.23-1984 Methods for chemical analysis of tungsten--The combustion-conductometric titration method for the determination of suphur content GB/T 4324.24-1984 Methods for chemical analysis of tungsten--The berylium as carrier precipitation agent-molybdenum blue photometric method for the determination of phosphorus content GB/T 4324.25-1984 Methods for chemical analysis of tungsten--The inert gas fusion-coulometric titration method for the determination of oxygen content GB/T 4324.26-1984 Methods for chemical analysis of tungsten--The Nessler reagent photometric method for the determination of nitrogen content GB/T 4324.27-1984 Methods for chemical analysisof tungsten--The combustion-coulometric titration method for the determinationof carbon content GB/T 4324.28-1984 Methods for chemical analysis of tungsten--The thiocy anate photometric method for the determin-ation of molybdenum content GB/T 4324.29-1984 Methods for chemical analysis of tungsten--The gravimetric method for the determination of residue content after chloride volatility GB/T 4324.30-1984 Methods for chemical analysis of tungsten--The gravimetric method for the determination of loss content on ignition