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Textual Amendments
F1 Inserted by Commission Regulation (EC) No 656/95 of 28 March 1995 amending Regulation (EEC) No 2568/91 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis and Council Regulation (EEC) No 2658/87 on the tariff and statistical nomenclature and on the Common Customs Tariff.
All reagents should be of analytical grade unless otherwise specified. The water used should be distilled water, or water of at least equivalent purity.
Textual Amendments
Alcoholic potash turns brown on standing. It should be prepared freshly each day and kept in well stoppered dark glass bottles. U.K.
Usually, silica gel can be used directly from the container without any treatment. However, some batches of silica gel may show low activity resulting in bad chromatographic separations. Under this circumstance, the silica gel should be treated in the following way: Activate the silica gel by heating for a minimum of four hours at 550 °C. After heating, place the silica gel in a desiccator while the gel is cooling and then transfer the silica gel to a stoppered flask. Add 2 % of water and shake until no lumps can be seen and the powder flows freely. U.K.
If batches of silica gel result in chromatograms with interfering peaks, the silica gel should be treated as above. An alternative could be the use of extra pure silica gel 60 (Merck, reference 7754).
The solutions 5.6 and 5.7 are stable for a period of at least four months if kept at less than 4 °C. U.K.