AI Article Synopsis
- This study focuses on measuring how different polycyclic aromatic hydrocarbons (PAHs) behave during a microextraction process from water samples using a technique called MEPS-GC-MS.
- The researchers optimized the extraction method by examining various parameters to improve the accuracy of solute recovery and concentration levels in different solutions.
- By analyzing real water samples and establishing a correlation between partition constants, the study offers a way to estimate partition coefficients using simplified measurements, demonstrating effective detection limits for PAHs in water.
Article Abstract
In this work, partition equilibriums and extraction rates of different polycyclic aromatic hydrocarbons (PAHs) have been calculated by multivariate nonlinear regression from data obtained after microextraction by packed sorbent (MEPS) of 16 PAHs from water samples. The MEPS gas chromatography-mass spectrometry (MEPS-GC-MS) method has been optimized investigating the partitioning parameters for a priori prediction of solute sorption equilibrium, recoveries, pre-concentration effects in aqueous and solvent systems. Finally, real samples from sea, agricultural irrigation wells, streams and tap water were analyzed. Detection (S/N ≥ 3) and quantification (S/N ≥ 10) limits were strictly dependent on the volume of water and methanol used during the extraction process. Under the experimental conditions used, these values range from 0.5 to 2 ngL(-1) and from 1.6 to 6.2 ngL(-1), respectively. The reasonably good correlation between the logarithm of the partition MEPS-water constants (logK(meps/water)) and the logarithm of the octanol-water partition coefficients (log K(ow)) (R(2)=0.807) allows a rough estimation of K(ow) from the measure of K(meps/water).
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| http://dx.doi.org/10.1016/j.chroma.2012.08.098 | DOI Listing |
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