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Determination of Low Levels of an Antioxidant in Polyolefins by Large-volume Injection Temperature-programmed Packed Capillary Liquid Chromatography by P Molander; K Haugland; D.R Hegna; E Ommundsen; E Lundanes; T Greibrokk is a Chemistry article available to read on EtoBox.

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Sub-ambient column temperatures, promoting strong interactions between the analyte and the stationary phase material, were utilized to focus large volumes of the polyolefin antioxidant Irganox 1076 [benzenepropanoic acid, 3,5-bis(1,1dimethylethyl)-4-hydroxy-, octadecyl ester] on the column inlet, using pure acetonitrile as sample solvent and mobile phase. Injection volumes up to 100 ml were successfully employed on a 50 cm3320 mm I.D. capillary column packed with 5 mm Kromasil 100 ODS particles. Irganox 1076 was eluted after completed injection by temperature programming, using a 21 temperature program from 7 to 908C, in 38C min . UV detection, using a low-dispersion ''U''-shaped flowcell, was performed at 280 nm. The method was applied for the determination of Irganox 1076 that was extracted from low-density polyethylene (0.6 ppm, w / w). Both Soxhlet and microwave-aided solvent extractions were performed, using chloroform and acetonitrile as solvents, respectively. The microwave-aided extraction with acetonitrile was found to give approximately the same yield as the standard Soxhlet reference method. Consequently, small volumes of acetonitrile could be used both as extraction sol

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Author

P Molander; K Haugland; D.R Hegna; E Ommundsen; E Lundanes; T Greibrokk

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)