Division 5.2.6 Preparation of the standard

Prepare a standard solution of mercaptoacetic acid (5.2.2.1) of known strength containing about 60 mg of pure mercaptoacetic acid (5.2.2.1) in 2 ml.

This is solution ‘E’.

Precipitate, assay and methylate as described in 5.2.4 and 5.2.5.