Third Commission Directive of 27 September 1983 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (83/514/EEC) (c. 514)

ANNEX U.K. DETERMINATION OF DICHLOROMETHANE AND 1,1,1-TRICHLOROETHANE

IDENTIFICATION AND DETERMINATION OF NITROMETHANE U.K.

5. DETERMINATION U.K.

5.1. Reagents U.K.

All reagents must be of analytical quality.

5.1.1. Chloroform (internal standard 1). U.K.

5.1.2. 2,4-dimethylheptane (internal standard 2). U.K.

5.1.3. Ethanol, 95 %. U.K.

5.1.4. Nitromethane. U.K.

5.1.5. Chloroform reference solution U.K.

Into a tared 25 ml volumetric flask, introduce about 650 mg of chloroform (5.1.1). Accurately reweigh the flask and contents. Make up to 25 ml with 95 % ethanol (5.1.3). Weigh and calculate the percentage by mass of chloroform in this solution.

5.1.6. 2,4-dimethylheptane reference solution U.K.

Make up in a similar manner to the chloroform reference solution but weigh 270 mg of 2,4-dimethylheptane (5.1.2) into the 25 ml volumetric flask.