IS 12612 : 1988 Method for colorimetric determination of tungsten

1 Scope

1.1 This standard prescribes two colorimetric methods fordetermination of tungsten using (a) thiocyanate with a reducingagent; and (b) toluene-3, 4-dithiol.

2 References

IS 2 :1960 Rules for roundingoff numerical value

IS 264 :1976 Specification for nitric acid

IS 265 :1976 Specification for hydrochloricacid

IS 266 :1977 Specification for sulphuricacid

IS 1070 : 1977Specitication for water for general laboratory use

IS 10332 : 1982Specification for hyctrofluoric acid, aqueous