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A straightforward deep eutectic solvent-based extraction for the determination of lead in drill cuttings by graphite furnace atomic absorption spectrometry

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Abstract

An environmentally friendly method was developed using deep eutectic solvent ultrasound-assisted extraction procedure (DES-UAE) for Pb determination in drill cuttings (DC) by graphite furnace atomic absorption spectrometry (GF AAS). In this study, 50 mg of the DC samples in 2.50 g of diluted DES (30% w/w of water) was subjected to UAE at 80 ± 5 °C for 50 min. The extraction parameters, temperature, time, and percentage of water in the DES, were evaluated using a Box–Behnken experimental design. Lead was determined by GF AAS, using Pd as a chemical modifier, 900 °C of pyrolysis, and 2100 °C of atomization temperatures. The results demonstrated that DES composed of choline chloride and oxalic acid (1:1 molar ratio) combined to UAE, showed greater Pb extraction efficiency. The precision (RSD < 3.8), the respective limits of detection and quantification (0.2 and 0.6 µg g−1), were suitable for Pb determination in DC. The method’s accuracy was evaluated through the analysis of certified reference materials and by comparing the results with those obtained by ICP-MS analysis after acid digestion and  no significant difference was observed (at 95% confidence level). The DES-UAE was applied to determine Pb in DC from different depths, with Pb concentration  ranging from 1.14 to 6.13 and 1.64 to 168.4 µg g−1 for samples from onshore and offshore wells, respectively.

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Acknowledgements

The authors are thankful to The National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)) and Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)) for their financial support.

Funding

The Funding was provided by Conselho Nacional de Desenvolvimento Científico e Tecnológico, 150259/2022-0, Bruno Luís Ferreira, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

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Correspondence to Bruno Luís Ferreira.

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Gonçalves, C., Ferreira, B.L., Lacerda, E.H.C. et al. A straightforward deep eutectic solvent-based extraction for the determination of lead in drill cuttings by graphite furnace atomic absorption spectrometry. Chem. Pap. 78, 5433–5444 (2024). https://doi.org/10.1007/s11696-024-03482-7

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