Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1077, Issue 1, Pages 19-27Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2005.04.074
Keywords
sunscreen agents; liquid chromatography; gas chromatography; cloud point extraction; bathing waters
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A preconcentration methodology utilizing the cloud point phenomenon is described in this study for the determination of sunscreen agent residues in bathing waters by reversed phase liquid chromatography with UV detection and gas chromatography (GC) with mass spectrometric (MS) detection. The method employs the entrapment of the analytes in the micelles of the non-ionic surfactant TX-114, upon increase of the solution temperature to 60 degrees C. The analytes are either re-extracted or back extracted from the final micellar extract into appropriate organic solvents, a procedure that facilitates the direct application of the method not only with liquid chromatography but mostly importantly with gas chromatographic analysis. Ultrasonication was employed to assist the procedure and accelerate the extraction of the analytes into the solvent phase. Under the optimum experimental conditions, the method affords satisfactory recoveries in the range of 95-102% and relative standard deviation lower than 6% without interference from the presence of the surfactant. The method was successfully applied to the determination of UV filters in natural waters. (c) 2005 Elsevier B.V. All rights reserved.
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