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Talanta

Title:		Vacuum-assisted sorbent extraction: An analytical methodology for the determination of ultraviolet filters in environmental samples
Author(s):		Trujillo-Rodriguez MJ; Anderson JL; Dunham SJB; Noad VL; Cardin DB;
Address:		"Department of Chemistry, Iowa State University, Ames, IA, 50011, USA. Department of Chemistry, Iowa State University, Ames, IA, 50011, USA. Electronic address: andersoj@iastate.edu. Entech Instruments Inc., Simi Valley, CA, 93065, USA"
Journal Title:		Talanta
Year:		2020
Volume:		20190925
Issue:
Page Number:		120390 -
DOI:		10.1016/j.talanta.2019.120390
ISSN/ISBN:		1873-3573 (Electronic) 0039-9140 (Linking)
Abstract:		"Vacuum-assisted sorbent extraction (VASE) has been applied in combination with gas chromatography-mass spectrometry for the determination of UV filters in water samples. VASE is a variant of headspace extraction which was developed in conjunction with the sorbent pen (SP) technology. This technique combines the advantages of both stir-bar assisted extraction and headspace solid-phase microextraction. The SP traps allowed both reduced pressure in-vial extraction and direct thermal desorption via a unique gas chromatographic injection port. The main parameters that affect the performance of VASE, including both extraction and desorption conditions, were extensively optimized. Under optimum conditions, extraction required 10?ª+mL of sample within 40?ª+mL vials, pH 3.5, ~30?ª+s of air-evacuation, 14?ª+h incubation at 70?ª+ degrees C, stirring at 200?ª+rpm, and a final water management step conducted at?ª+~?ª+-17?ª+ degrees C for 15?ª+min. Optimal thermal desorption required preheating at 260?ª+ degrees C for 2?ª+min followed by desorption at 300?ª+ degrees C for 2?ª+min. The beneficial effect of reduced-pressure extraction was demonstrated by comparing the UV filter extraction time profiles collected using VASE to an analogous atmospheric pressure procedure, resulting in up to a 3-fold improvement under optimized conditions. The VASE methodology enabled simultaneous extractions using different SPs without compromising the method reproducibility, which increases the overall sample throughput. The method was characterized by low limits of detection, from 0.5 to 80?ª+ng?ª+L(-1), and adequate reproducibility, with inter-SP and inter-day relative standard deviation lower than 14%. Tap and lake water was successfully analyzed with the proposed methodology, resulting in relative recoveries of spiked samples ranging between 70.0 and 120%"
Keywords:		Environmental analysis Gas chromatography Mass spectrometry Ultraviolet filters Vacuum-assisted sorbent extraction;
Notes:		"PubMed-not-MEDLINETrujillo-Rodriguez, Maria J Anderson, Jared L Dunham, Sage J B Noad, Victoria L Cardin, Daniel B eng Netherlands 2019/12/11 Talanta. 2020 Feb 1; 208:120390. doi: 10.1016/j.talanta.2019.120390. Epub 2019 Sep 25"