Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1124, Issue 1-2, Pages 51-56Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2006.04.086
Keywords
pressurized fluid extraction; polyethylene; additives; oleamide; erucamide
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A pressurized fluid extraction (PFE) and gas chromatography-flame ionization detection (GC-FID) method is proposed to determine the slip agents in polyethylene (PE) films. The study of PIE variables was performed using a fractional factorial design (FFD) for screening and a central composite design (CCD) for optimizing the main variables obtained from the Pareto charts. The variables that were studied include temperature, static time, percentage of cyclohexane and the number of extraction cycles. The final condition selected was pure isopropanol (two times) at 105 degrees C for 16 min. The recovery of spiked oleamide and erucamide was around 100%. The repeatability of the method was between 9.6% for oleamide and 8% for erucamide, expressed as relative standard deviation. Finally, the method was applied to determine oleamide and erucarnide in several polyethylene films and the results were statistically equal to those obtained by pyrolysis and gas-phase chemiluminescence (CL). (c) 2006 Elsevier B.V. All rights reserved.
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