Low-cost approach to increase the analysis throughput of bar adsorptive microextraction (BAµE) combined with environmentally-friendly renewable sorbent phase of recycled diatomaceous earth

• Published in: Talanta (Oxford) Vol. 178; pp. 886 - 893
• Main Authors: Mafra, Gabriela, Oenning, Anderson Luiz, Dias, Adriana Neves, Merib, Josias, Budziak, Dilma, Silveira, Cristian Berto da, Carasek, Eduardo
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-02-2018
• Subjects: Bar adsorptive microextraction; Benzophenone; Parabens; Triclocarban, Diatomaceous earth; Water samples; Bar adsorptive microextraction; Triclocarban, Diatomaceous earth; Water samples; Parabens; Benzophenone
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2017.10.022

In this study, a novel apparatus for bar adsorptive microextraction (BAµE) using a voltage regulator was proposed as an alternative tool to improve the analysis throughput. In addition, recycled diatomaceous earth obtained as a brewery residue was employed as a biosorbent coating for the determination of methyl paraben, ethyl paraben, benzophenone and triclocarban in water samples by high-performance liquid chromatography-diode array detection (HPLC-DAD). The use of the extraction devices, comprised of floating adsorptive bars of 7.5mm length, in the extractions with magnetic stirrers linked to a voltage regulator enabled the analysis of multiple samples, simultaneously. The method optimization was carried out by univariate and multivariate analyses. The optimal conditions for the method were sample solution at pH 5, extraction time of 90min and liquid desorption in 100µL of acetonitrile:methanol (50:50, v/v) for 15min. The total sample preparation time was 17.5min per sample for a simultaneous batch of six extractions. The R2 values for the calibration curves obtained were higher than 0.9985. The limits of detection (LODs) varied from 0.19 to 2μgL−1 and the limits of quantification (LOQs) ranged from 0.63 to 6.9μgL−1. The method was applied to freshwater samples collected from Peri Lagoon (Florianópolis, SC, Brazil) and the relative recoveries ranged from 63% to 124% with relative standard deviations (RSDs) of < 20% (n = 2). The RSD values for the reproducibility of the performance of the magnetic stirrers and inter-device extraction efficiency were lower than 14% (n = 3) and 11% (n = 3), respectively.
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•Novel and low-cost configuration to increase the analysis throughput for bar adsorptive microextraction is proposed.•A green sorbent phase comprised of recycled diatomaceous earth is used for the determination of endocrine disruptor compounds.•Rapid sample preparation was achieved (17.5min per sample).