S.L. 449.35 ст. 3specified. distilled water 500 mg/litre point 3.1.

Reagents

- All reagents must be of analytical quality, unless otherwise - Where reference is made to water, it shall always mean or water of equivalent quality.

3.1. 4% (v/v) acetic acid, in aqueous solution Add 40 ml of glacial acetic acid to water and make up to 1 000 ml. 3.2. Stock solutions

Prepare stock solutions containing 1 000 mg/litre of lead and at least of cadmium respectively in a 4% acetic acid solution, as referred to in