Determination of organic UV filters in water by stir bar sorptive extraction and direct analysis in real-time mass spectrometry |
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Authors: | Manuela Haunschmidt Christian W Klampfl Wolfgang Buchberger Robert Hertsens |
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Institution: | (1) Institute of Analytical Chemistry, Johannes-Kepler-University, Altenbergerstrasse 69, 4040 Linz, Austria;(2) JEOL (Europe) BV, Leuvensesteenweg 542, 1930 Zaventem, Belgium |
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Abstract: | A screening method for analyzing environmental waters contaminated with UV filters using direct analysis in real-time mass
spectrometry (DART-MS) was developed. To demonstrate the suitability of DART-MS a test set of seven organic UV filters, namely
benzophenone-3 (BP-3), ethylhexyl dimethyl p-aminobenzoate (OD-PABA), 4-t-butyl-4′-methoxydibenzoylmethane (BM-DBM), homomethyl salicylate (HMS), 2-(ethylhexyl) salicylate (EHS), octocrylene (OC),
and 4-methylbenzylidene camphor (4-MBC), was defined. In the first step, standard solutions of the analytes prepared in methanol
were investigated in order to determine optimum parameters for the DART-MS. Because of the very low concentrations of UV filters
expected in environmental water samples, a pre-concentration step using stir bar sorptive extraction was performed. DART-MS
allows the direct, simple and rapid semi-quantitative analysis of the analytes enriched on the surface of the polydimethylsiloxane-coated
stir bars. The optimized method provided calibration curves with correlation coefficients R > 0.959, repeatability from 5% (for 4-MBC) to 30% (for BM-DBM) relative standard deviation and limits of detection lower
than 40 ng L−1 for all analytes. Finally, real lake water samples from locations with typical leisure activities were analyzed. Results
obtained with the developed DART-MS method were cross-checked by confirmatory analysis using thermodesorption gas chromatography
mass spectrometry (TD-GC-MS). Thereby, it could be demonstrated that both analytical methods provide comparable concentrations
for the UV filters in the lake water samples. |
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