2008•Environmental ChemistryRequires access

STUDY ON OPTIMIZING EXTRACTION PARAMETERS OF OIL IN OIL-CONTAMINATED SOIL

Nanwen Zhu

Abstract

The determination of oil in oil-contaminated soil by infrared spectrophotometer and gas chromatography requires sufficient extraction. The extraction parameters including the quantity and type of extraction solvent, the extraction time and repeat times, temperature and pH were studied in the paper. The results showed that hexane was the best solvent. The optimal quantity of used hexane was 6—7ml·g-1 dry soil, at which the most oil extraction was obtained. The extraction efficiency increased within 24h and then the rise was not obvious. It also increased with the repeate times until 100% extraction was obtained. The extraction efficiency was high at relatively low pH and seriously inhibited when pH7. The most moderate extraction temperature was 50—60℃.

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Key concepts: Extraction (chemistry), Hexane, Solvent, Contamination, Chromatography, Chemistry, Soil contamination, Oil analysis