Most of the papers that treat the composition of essential oils for this purpose use GCMS or GCMS and GC-FID techniques for the identification and/or quantification of individual compounds. Therewithal, papers usually treat the composition as semi-quantitative (percentage composition as the area of the peak of a particular compound in relation to the total area of the peaks on the chromatogram, given as 100%). At the same time, the quality of the results is not treated in metrological terms. A GCMS method for the quantification of components present Helichrysum italicum hydro-distilled essential oil samples from Bosnia and Herzegovina with a similar composition was developed and optimized. The stability of the method set-up and adequacy of sample storage and manipulation was assessed. Calibration method and assessment of measurement uncertainty was established for neryl acetate, one of the major compounds with known health benefits.
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