Determination of parabens and endocrine-disrupting alkylphenols in soil by gas chromatography–mass spectrometry following matrix solid-phase dispersion or in-column microwave-assisted extraction: a comparative study

• Published in: Analytical and bioanalytical chemistry Vol. 402; no. 7; pp. 2347 - 2357
• Main Authors: Pérez, R. A., Albero, B., Miguel, E., Sánchez-Brunete, C.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.03.2012; Springer
• Subjects: Alkylphenols; Analysis; Analytical Chemistry; Biochemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Cleaning; Dispersions; Drying; Endocrine Disruptors - analysis; Extraction; Food Science; Gas chromatography; Gas Chromatography-Mass Spectrometry - methods; Laboratory Medicine; Mass spectrometry; Microwaves; Monitoring/Environmental Analysis; Original Paper; Parabens - analysis; Phenols - analysis; Recovery; Soil (material); Soil Pollutants - analysis; Spain; GC-MS; MAE; Soil; Alkylphenols; MSPD; Parabens
• DOI: 10.1007/s00216-011-5248-0
• ISSN: 1618-2642

Two rapid methods were evaluated for the simultaneous extraction of seven parabens and two alkylphenols from soil based on matrix solid-phase dispersion (MSPD) and microwave-assisted extraction (MAE). Soil extracts were derivatized with N , O -bis(trimethylsilyl)trifluoroacetamide and analyzed by gas chromatography with mass spectrometry. Extraction and clean-up of samples were carried out by both methods in a single step. A glass sample holder, inside the microwave cell, was used in MAE to allow the simultaneous extraction and clean-up of samples and shorten the MAE procedure. The detection limits achieved by MSPD were lower than those obtained by MAE because the presence of matrix interferences increased with this extraction method. The extraction yields obtained by MSPD and MAE for three different types of soils were compared. Both procedures showed good recoveries and sensitivity for the determination of parabens and alkylphenols in two of the soils assayed, however, only MSPD yielded good recoveries with the other soil. Finally, MSPD was applied to the analysis of soils collected in different sites of Spain. In most of the samples analyzed, methylparaben and butylparaben were detected at levels ranging from 1.21 to 8.04 ng g −1 dry weight and 0.48 to 1.02 ng g −1 dry weight, respectively.