BS 3900-B4:1986

This standard BS 3900-B4:1986 Methods of test for paints. Tests involving chemical examination of liquid paints and dried paint films is classified in these ICS categories:

• 87.040 Paints and varnishes

This International Standard describes a flame atomic absorption spectrometric method for the determination of total lead in paints and related products.

The method is applicable to products having total lead contents in the range of about 0,01 to 2 % (m/m).

NOTE This method may also be applicable to products with a total lead content of more than 2 % (m/m), but it should only be used when the precision does not exceed the appropriate values given in 7.2.

Two methods are given for the treatment of the test portion; the dry ashing method (clause 4) should be used as the referee method in cases of dispute.

For the determination of lead in the test solution, the dithizone spectrophotometric method specified in ISO 3856/1 may be used as an alternative method.

Two procedures: a dry ashing method and a wet oxidation method, to extract the lead from the paint, before determining the lead by a flame atomic absorption spectrometric method.