Effect of moisture on supercritical fluid extraction of polynuclear aromatic hydrocarbons and phenols from soil using an automated extractor
✍ Scribed by Ashraf-Khorassani, Mehdi ;Combs, Michael T. ;Taylor, Larry T.
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 392 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0935-6304
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
An automated supercritical fluid extraction system was evaluated with polynuclear aromatic hydrocarbons and phenols to demonstrate extraction efficiency, collection efficiency, and sample cross contamination. Results showed that 75/25 glass beads/octadecyl silica provided the highest collection efficiency for these classes of compounds. Also, the automated SFE system was used to study the effect of different percentages of water (w/w) in soil on extraction efficiency of fortified PAH and phenols at different temperatures and pressures. Results showed that the presence of (available) water in soil (>10%) does, increase extraction efficiency of higher molecular weight PAH at higher temperature. Also it was demonstrated that temperature rather than pressure had a marked effect on extraction efficiency. The extraction efficiency of phenols from soil which contained 5% of water, using pure supercritical CO~2~, was higher than those obtained from dry soil or soil containing 1 % water. Extraction of phenols from soil did not show a dependence on pressure or temperature.