NBN T 03-418-1983 Aluminium oxide primarily used for the production of aluminium - Determination of fluorine content - Alizarin complexone and lanthanum chloride spectrophotometric method
1982NBN T 03-418-1983 Aluminium oxide primarily used for the production of aluminium - Determination of fluorine content - Alizarin complexone and lanthanum chloride spectrophotometric method