The method is based on drying the sample in an oven at (105+ -5) degrees. From to constant mass and determining the loss of its mass
GOST 27561-1987 Referenced Document
GOST 16598-1980 Manganese ores, concentrates and agglomerates. Methods of sampling and preparation of samples for chemical analysis and determination of moisture content
GOST 27561-1987 history
1987GOST 27561-1987 Manganese ores, concentrates and sinters. Gravimetric method for determination of moisture content