Annex VI

Annex XVIII is amended as follows:

1. (1)

   point 4.2.1 is replaced by the following:

   ‘4.2.1.

   Petroleum ether 40-60 °C chromatographic grade or hexane. Hexane may be replaced by iso-octane (2,2,4-trimethyl pentane in chromatography grade), provided that comparable precision values are achieved. Solvents with higher boiling point than n-hexane take longer to evaporate. However, they are preferred due to the toxicity of hexane.’;

2. (2)

   the following point 4.2.12 is added:

   ‘4.2.12.

   Heptane, chromatographic quality. Heptane may be replaced by iso-octane (2,2,4-trimethyl pentane in chromatography grade).’.