A high throughput approach to rotating-disk sorptive extraction (RDSE) using laminar cork for the simultaneous determination of multiclass organic micro-pollutants in aqueous sample by GC-MS

Camila M S Vieira; Gabriela Mafra; Rafael Brognoli; Pablo Richter; Milton Rosero-Moreano; Eduardo Carasek

doi:10.1016/j.talanta.2019.120459

A high throughput approach to rotating-disk sorptive extraction (RDSE) using laminar cork for the simultaneous determination of multiclass organic micro-pollutants in aqueous sample by GC-MS

Talanta. 2020 Feb 1:208:120459. doi: 10.1016/j.talanta.2019.120459. Epub 2019 Oct 9.

Authors

Camila M S Vieira¹, Gabriela Mafra¹, Rafael Brognoli¹, Pablo Richter², Milton Rosero-Moreano³, Eduardo Carasek⁴

Affiliations

¹ Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, 88040900, SC, Brazil.
² Department of Inorganic and Analytical Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, P.O. Box 233, Santiago, Chile.
³ Grupo de Investigación en Cromatografía y Técnicas Afines GICTA, Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Caldas, Calle 65 Nº. 26-10, Manizales, P.O. 170004, Colombia.
⁴ Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, 88040900, SC, Brazil. Electronic address: eduardo.carasek@ufsc.br.

PMID: 31816779
DOI: 10.1016/j.talanta.2019.120459

Abstract

In this study, a high throughput approach to rotating-disk sorptive extraction (RDSE) using laminar cork as extraction phase is demonstrated for the first time in the determination of 20 multiclass organic micro-pollutants including pesticides, PAHs and UV filters compounds from aqueous samples with gas chromatography mass spectrometry (GC-MS). The influencing parameters (desorption solvent, volume and time, extraction time and sample pH and ionic strength) were carefully optimized using multivariate designs. The optimal conditions were 10 min for extraction using 35 mL of water samples and a liquid desorption using 1 mL of MeOH:AcOEt (50:50% v/v) for 20 min. A low-cost apparatus that allows six extractions simultaneously, providing a high throughput of 5 min per sample turnaround times, considering the sample preparation step was used for the first time in this modified RDSE methodology. Satisfactory analytical performance was achieved with limits of detection (LOD) between 0.08 and 1.5 μg L^-1 and limits of quantification (LOQ) between 0.3 and 4.8 μg L^-1. The relative recoveries for the analytes were determined using river and lake water samples spiked at different concentrations and ranging from 80% to 119% for all analytes, with relative standard deviations (RSD) lower than 20%. The extraction efficiency obtained for the proposed configuration with laminar cork was significantly superior to powdered cork, demonstrating an interesting new configuration for new applications.

Keywords: Cork; Environmental water samples; Microextraction; Organic micro-pollutants; Rotating-disk sorptive extraction.