BS 6870 is a series on analyses of aluminium ores. Aluminium ores are a chemical element with the symbol Al and atomic number 13. BS 6870-2.2 specifies a gravimetric loss of mass method for the determination of hygroscopic moisture in analytical samples of aluminium ores.
The method is applicable to products having hygroscopic moisture contents, expressed as water (H2O), in the range 0,1 to 5 % (m/m), and shall be used to correct the results obtained for aluminium and loss of mass at 1 075 °C to a dry basis.
BS 6870-2.2 on the determination of hygroscopic moisture in analytical samples is useful for:
Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has a great affinity toward oxygen and forms a protective layer of oxide on the surface when exposed to air. Drying of the test portion in the air at approximately 105 °C and recording of the loss of mass. BS 6870-2.2 states that the weigh, to the nearest 0,000 1 g, approximately 2 g of the pre-equilibrated test sample directly into the dried and tared weighing bottle.
Record the mass (m2). Also, at this stage weigh test portions required for the determination of constituents for which correction of the analytical values to a dry basis is required (e.g., loss of mass at 1 075 °C and aluminium content) and transfer such test portions to the vessels specified. Using BS 6870-2.2 you can specify a gravimetric loss of mass method for the determination of hygroscopic moisture in analytical samples of aluminium ores.