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Original Articles

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

ORCID Icon, , ORCID Icon, ORCID Icon & ORCID Icon
Pages 1363-1377 | Received 11 Sep 2019, Accepted 11 Oct 2019, Published online: 04 Nov 2019
 

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.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed here.

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].

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