Evolution of a method for quantitative supercritical fluid extraction of Ethanox 330 antioxidant from high-density polyethylene
1998; Elsevier BV; Volume: 811; Issue: 1-2 Linguagem: Inglês
10.1016/s0021-9673(98)00263-5
ISSN1873-3778
AutoresA. M. P. Pinto, Larry T. Taylor,
Tópico(s)Ionic liquids properties and applications
ResumoSupercritical fluid extraction (SFE) was employed prior to the HPLC assay of the additive Ethanox® 330 from high-density polyethylene (HDPE). The effects of temperature, various modifiers and modifier concentration were investigated. The use of extraction temperatures above 95°C for the additive-containing polymer resulted in less than quantitative recovery and the appearance of a degradate peak in the extract chromatogram. A 70-min extraction was found to be optimum for HDPE when using greater than 10% methylene chloride- or methanol-modified CO2. After discovering the optimal extraction temperature, we found that rinsing the octadecylsilica solid-phase trap with methylene chloride rather than methanol improved the recovery efficiency. Recoveries of greater than 90% can be achieved in all cases when the primary antioxidant, Ethanox 330, appears in the presence of secondary antioxidants.
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