BS 4140-19:1986

Gives a curcumin spectrophotometric method for determining boron content of aluminium oxide used for the production of aluminium. Applicable to boron contents, expressed as boron oxide greater than 0,0006%.

This International Standard specifies a curcumin spectrophotometric method for the determination of the boron content of aluminium oxide primarily used for the production of aluminium.

The method is applicable to boron contents, expressed as boron oxide (B₂O₃), greater than 0,000 6 % [i.e. 0,000 2 % expressed as boron (B)].

NOTE The sensitivity of the method, as may be gathered from the calibration curve, is in fact higher. In the case of a very low blank reading, and with sufficiently sensitive apparatus, the lower limit of application of the method may be extended to 0,000 08 % of boron oxide (B₂O₃), corresponding to 0,000 025 % of boron (B).