Essential oil—Analysis by gas chromatography on capillary columns—General method
1 Scope
This standard specifies a general method for the analysis of essential oils by gas chromatography on capillary columns for the purpose of determining the content of a specific constituent and/or searching for a characteristic profile.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB 11539-1989 Isolate and synthetic aromatics—Analysis by gas chromatography on packed columns—General method (neq ISO 7359:1985)
GB/T 14454.1-1993 Aromatics—Preparation of test sample (neq ISO 356:1977)
3 Principle
Analysis by gas chromatography under specified conditions of a small quantity of essential oil on a column of small diameter but great length, the inside wall of the column having been previously coated either directly with a specified stationary phase or with an impregnated support (column coated internally with impregnated support).
If required, identification of the different constituents from their retention indexes.
Quantitative determination of specific constituents by measurement of peak areas.
4 Reagents and products
During the analysis, unless otherwise specified, use only reagents of recognized analytical grade and freshly distilled products.
4.1 Carrier gas: hydrogen , helium or nitrogen, according to the type of detector used. If
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Principle
4 Reagents and products
5 Apparatus
6 Preparation of test sample
7 Operating conditions
8 Column performance
9 Determination of retention indexes
10 Methods of determination
11 Expression of results
12 Test report
