# Commission Regulation (EEC) No 2568/91 of 11 July 1991 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis, Division 4: REAGENTS

Extent: E+W+S+N.I.

4.1. Anhydrous pyridine, for chromatography quality.
4.2. Hexamethyl disilazane of analytical quality.
4.3. Trimethylchlorosilane of analytical quality.
4.4. Sample solutions of sterol trimethylsilyl ethers. To be prepared at the time of use from sterols and erythrodiol obtained from oils containing them.
4.5. Standard solutions of trimethylsilyl ethers of aliphatic alcohols from C20 to C28. They may be prepared from mixtures of pure alcohols at the time they are required for use.
4.6. Carrier gas: hydrogen or helium, gas-chromatographic purity.
4.7. Auxiliary gases: hydrogen, helium, nitrogen and air, of gas-chromatographic purity.
4.8. Silylation reagent, consisting of a 9:3:1 (V/V/V) mixture of pyridine/hexamethyl disilazane/trimethylchlorosilane.
4.9. n-Hexane, for chromatography quality.

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/XIX/part/3/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-XIX/part-3/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.