This standard establishes a spectral method for the determination of magnesium, iron, aluminum, silicon (with a mass fraction of each from 0.01 to 0.7%)
GOST 23687.2-1979 Referenced Document
GOST 14261-1977 Hydrochloric acid super pure. Specifications
GOST 14919-1983 Household electric cooking ranges, cooking plates and cooking ovens. General specifications*, 1983-04-19 Update