Analysis of naphthenic acids in produced water samples by capillary electrophoresis-mass spectrometry.

Autor: Pinheiro KMP; Instituto de Química, Universidade Federal de Goiás, Goiânia, Brazil., Sako AVF; Instituto de Química, Universidade Federal da Santa Catarina, Florianópolis, Brazil., Rodrigues MF; Instituto de Química, Universidade Federal de Goiás, Goiânia, Brazil., Vaz BG; Instituto de Química, Universidade Federal de Goiás, Goiânia, Brazil., Medeiros Junior I; Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello (CENPES), Rio de Janeiro, Brazil., Carvalho RM; Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello (CENPES), Rio de Janeiro, Brazil., Coltro WKT; Instituto de Química, Universidade Federal de Goiás, Goiânia, Brazil.; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Campinas, Brazil.
Jazyk: angličtina
Zdroj: Journal of separation science [J Sep Sci] 2023 Oct; Vol. 46 (19), pp. e2300442. Date of Electronic Publication: 2023 Aug 15.
DOI: 10.1002/jssc.202300442
Abstrakt: A capillary electrophoresis-mass spectrometry method was used to analyze naphthenic acids in produced water samples. It was possible to detect cyclopentanecarboxylic, benzoic, cyclohexanebutyric, 1-naphthoic, decanoic, 3,5-dimethyladamantane-1-carboxylic, 9-anthracenecarboxylic, and pentadecanoic acids within ca. 13 min using a buffer composed of 40 mmol/L ammonium hydroxide, 32 mmol/L acetic acid and 20% v/v isopropyl alcohol, pH 8.6. The proposed method showed good repeatability, with relative standard deviation (RSD) values of 6.6% for the sum of the peak areas and less than 2% for the analysis time. In the interday analysis, the RSD values for the sum of the peak areas and migration time were 10.3% and 10%, respectively. The developed method demonstrated linear behavior in the concentration range between 5 and 50 mg/L for benzoic, decanoic, 3,5-dimethyladamantane-1-carboxylic and 9-anthracenecarboxylic acids, and between 10 and 50 mg/L for cyclopentanecarboxylic, cyclohexanebutyric, 1- naphthoic, and pentadecanoic acids. The detection limits values ranged from 0.31 to 1.64 mg/L. Six produced water samples were analyzed and it was possible to identify and quantify cyclopentanecarboxylic, benzoic, cyclohexanebutyric, and decanoic acids. The concentrations varied between 4.8 and 98.9 mg/L, proving effective in the application of complex samples.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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