Headspace-gas chromatography for determination of BTEX in human milk
2011
Winyu Chitsamphandhvej(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Chemistry) E-mail:[email protected] | Jidapa Wongkaewmuang(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Chemistry) | Tanapol Ittiritpaisan(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Chemistry)
This research had studied the factors affect the sensitivity of BTEX determination including sample type, volume of sample, salting out by using NaCl, temperature of headspace oven and heating time. BTEX in 5.00 mL of milk sample was heated at 70 deg C for 15 minutes and BTEX compounds were determined by GC/FID. The BTEX detection limit of this method mentioned above were lower than 0.40 ppb for benzene, toluene, ethylbenzene and lower than 1.3 ppb for xylene, respectively. The relative standard deviation of this method is less than 2 percent. The calibration curves of BTEX standard in aqueous and in milk were plotted. They showed good linearity with a correlation coefficient R sup(2) GT 0.999. The recoveries of BTEX depend on lipid content in milk samples. It was found that increase of lipid content in samples can reduces the analysis recoveries.
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