Results

The method described here has been applied to the determination of 21 target fragrance substances in consumer products. The chromatographic separation of these 21 compounds employing GC is shown in Figure 1. Day-to-day variation of retention times of the fragrance substances is < 0.5%. The detection limits of all of the target substances are < 1 p.p.m., the calibration curves for all of the target substances are linear (coefficient of correlation > 0.995) in the tested concentration range 10-2000 p.p.m., the relative standard deviations of the determination of all of the substances are < 11%. The recovery of all of the target substances from the spiked samples is 82-116%, and day-to-day variations of quantitative analysis for all of the substances are within 5%.

The reconstructed ion chromatogram obtained by GC-MS analysis of fragrance substances in a deodorant (undiluted) is shown in Figure 2. The fragrance substances in the product were identified by comparing the retention times of the GC peaks with those of the reference materials, as well as by comparing the spectra of the GC peaks with the reference spectra of standard compounds in the mass spectrum library. Followed by GC-MS identification, quantification of target fragrance substances in the sample is carried out with external standards.

Most consumer products contain many more fragrance substances other than the target compounds. The identification of these substances was only performed by comparing the mass spectrum of a GC peak with the mass spectra of reference compounds in the MS library. In this case, both the spectrum fit and spectrum purity of match of the unknown spectrum with those of library spectra were > 900. An example of identification of fragrance substances in an eau de toilette is shown in Figure 3A-E, where the results are divided in six windows for the clarity of peak identification. Confirmation of the identification of these substances and their quantification were performed where a reference material was available.

In some cases it is not possible to identify all the peaks because of the absence of mass spectra of the compounds in the mass spectral library.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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