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Selective Accelerated Solvent Extraction for the Analysis of Soil Polycyclic Aromatic Hydrocarbons and Sterols

Rozita Osman , and Nor’ashikin Saim, and Md Pauzi Abdullah, (2008) Selective Accelerated Solvent Extraction for the Analysis of Soil Polycyclic Aromatic Hydrocarbons and Sterols. Malaysian Journal of Analytical Sciences, 12 (2). pp. 352-356. ISSN 13942506

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Official URL: http://pkukmweb.ukm.my/~mjas/v12_n2/Rozita%20Osman.pdf

Affiliations

Universiti Teknologi MARA, Faculty of Applied Sciences
Universiti Teknologi MARA, Faculty of Applied Sciences
Universiti Kebangsaan Malaysia, Faculty of Science and Technology

Abstract

Accelerated solvent extraction (ASE) has been successfully used in the analysis of a wide range of chemicals from many
sample matrices. However, the main problem with accelerated solvent extraction is low selectivity towards the analyte
because during the extraction process, many interfering components are co-extracted together with target analytes and thus requires post-extraction clean-up processes. In this study, a selective accelerated solvent extraction with clean-up step incorporated inside the extraction cell was developed for the analysis of polycyclic aromatic hydrocarbons (PAHs) and sterols in soil. PAHs (naphthalene, acenaphtene, anthracene, pyrene) and sterols (coprostanol, cholesterol, stigmasterol, stigmastanol) were extracted separately using two elution steps. The selectivity and efficiency of this approach were evaluated using several sorbents and proper choice of solvents. Using polar sorbents, PAHs were recovered in the first extraction using n-hexane while sterols were recovered in the second extraction using a more polar solvent such as methanol, isopropanol, acetone and mixture of DCM:MeOH (40:60, v/v). Recoveries for PAHs ranged from 76.5-99.2 % and sterols from 83.7.7-91.4% using silica as the sorbent, n-hexane as the first eluent, and methanol as the second eluent.

Item Type:Journal
Additional Information:The authors would like to acknowledge financial support of Universiti Teknologi MARA for funding this project.
Keywords:Accelerated solvent extraction, polycyclic aromatic hydrocarbons, sterols.
Subjects:Q Science, Computer Science
ID Code:4059

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