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Optimizing separation conditions for polycyclic aromatic hydrocarbons in micellar electrokinetic chromatography
Journal of Chromatography. A
|August 28, 2001
Summary
Poly(ethylene oxide) (PEO) in micellar electrokinetic chromatography (MEKC) enhances polycyclic aromatic hydrocarbon (PAH) separation by reducing capillary adsorption. Dextran sulfate (DS) proved superior to tetrapentylammonium iodide (TPAI) for improved resolution and speed.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants requiring sensitive detection methods.
- Micellar electrokinetic chromatography (MEKC) is a powerful separation technique, but challenges remain in resolving complex PAH mixtures.
Purpose of the Study:
- To investigate the efficacy of poly(ethylene oxide) (PEO) in MEKC for separating PAHs.
- To evaluate the impact of additives like dextran sulfate (DS) and sodium lauryl sulfate (SDS) on PAH separation efficiency.
Main Methods:
- Utilized 0.1% PEO in MEKC to separate PAHs.
- Investigated the effects of tetrapentylammonium iodide (TPAI), DS, methanol, and SDS on separation.
- Employed a stepwise MEKC technique to optimize resolution and sensitivity for challenging PAH samples.
Main Results:
- PEO addition reduced PAH adsorption to the capillary wall, improving resolution and reproducibility.
- DS demonstrated superior performance over TPAI for PAH separation in terms of resolution and speed.
- A method was developed to separate 10 PAHs in under 12 minutes; however, separation of seven specific PAHs was not achieved under initial conditions, prompting the development of a stepwise technique.
Conclusions:
- PEO is an effective additive for enhancing PAH separation in MEKC.
- A stepwise MEKC approach significantly improved the resolution and sensitivity for separating challenging PAH mixtures, achieving separation in 35 minutes.