Monitoring traces of organochlorine pesticides in herbal matrices by bar adsorptive microextraction – Application to black tea and tobacco

ABSTRACT

Bar adsorptive microextraction followed by microliquid desorption and gas chromatography-mass spectrometry, under the selected ion monitoring acquisition mode, has been developed for the determination of 20 organochlorine pesticides (OCPs) in herbal matrices. Assays performed on 25 mL of ultra-pure water samples spiked at the 2.0 µg L⁻¹ level, yielded average recoveries ranging from 14.0% to 95.1% for the target OCPs, under optimised experimental conditions. The proposed analytical methodology demonstrated suitable detection limits (0.10–0.15 µg L⁻¹) and good linear dynamic ranges (0.5–100.0 µg L⁻¹) with determination coefficients equal or higher than 0.9900. The proposed methodology, by using the standard addition method, proved to be a suitable sorption-based static microextraction alternative to monitor traces of OCPs in black tea and tobacco products, in compliance with the green analytical chemistry principles.

KEYWORDS:

• Bar adsorptive microextraction
• GC-MS
• OCPs
• black tea
• tobacco

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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Additional information

Funding

This study was funded by Fundação para a Ciência e Tecnologia, Portugal (UID/MULTI/00612/2019), as well as in regards for the PhD grant (SFRH/BD/107892/2015) and contract established from DL 57/2016. The authors also acknowledge CAPES (Brazil) for funding the PhD grant (BEX 0394-14-9); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior [CAPES, Brazil] ; Fundação para a Ciência e a Tecnologia [FCT, Portugal, UID/MULTI/00612/2019].