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A novel cloud-point extraction process for preconcentrating selected polycyclic aromatic hydrocarbons in aqueous
1Department of Chemical and Environmental Engineering, The National University of Singapore, Crescent.
Environmental Science & Technology
|October 20, 2001
Summary
A new cloud-point extraction method efficiently preconcentrates polycyclic aromatic hydrocarbons (PAHs) using a biodegradable surfactant. This technique simplifies PAH analysis by eliminating interference and improving recovery rates.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- Polycyclic Aromatic Hydrocarbons (PAHs) are environmental contaminants.
- Accurate detection of PAHs at trace levels is crucial for environmental monitoring.
Purpose of the Study:
- To develop a novel and simple cloud-point extraction (CPE) process for preconcentrating trace PAHs.
- To determine selected PAHs using high-performance liquid chromatography (HPLC) with fluorescence detection after CPE.
Main Methods:
- Utilized a biodegradable nonionic surfactant, Tergitol 15-S-7, for cloud-point extraction at ambient temperature.
- Analyzed PAHs (naphthalene, phenanthrene, pyrene) using HPLC with fluorescence detection.
- Optimized experimental conditions including surfactant concentration, salt addition, equilibration time, and centrifugation.
Main Results:
- Achieved high recovery rates: >80% for phenanthrene and pyrene, and 96% for naphthalene.
- Tergitol 15-S-7 showed no fluorometric interference with PAH detection.
- Eliminated the need for a surfactant washing step prior to HPLC analysis.
Conclusions:
- The developed CPE process is effective for preconcentrating and determining trace PAHs.
- The method offers a simplified analytical procedure with high efficiency and no interference.
- Optimized conditions provide a robust protocol for ambient temperature PAH analysis.