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An improved quantification method for 12 linear dimethylsiloxanes and 1 cyclic dimethylsiloxane in polydimethylsiloxane using gas chromatography-flame ionization detector:Development strategy and accuracy.
Journal of Chromatography. A 2018 October 4
PDMS 200 fluid (the mixture) was used as standard for quantification of linear dimethylsiloxanes (L5-L16) in environmental matrices. However, the quantification of individual dimethylsiloxane in PDMS 200 fluid by GC-FID was not established or detailed described in many real studies. To solve this problem, we did this research and the principal results were as follows: fifteen compounds in PDMS 200 fluid, including D7, L5 to L16 (12 linear dimethylsiloxanes) and 2 unknown compounds, were identified using GC-MS. Retention indices (RI) of L8 to L16 were first given. Meanwhile, we found that the "effective carbon number (ECN) concept" was applicable for responses of dimethylsiloxanes in FID. Based on GC-FID, a new quantification method for compounds in PDMS 200 fluid was established, detailed described and used to calculate the content of individual dimethylsiloxane in PDMS 200 fluid. Compared with the results from external standard method, internal standard method and normalization method, the new quantification method was more accurate and stable, especially for D7 at low content.
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