Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1517, Issue -, Pages 26-34Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2017.08.045
Keywords
Carboxylic acids; Dispersive liquid-liquid microextraction; Gas chromatography; Injection port derivatization; Mass spectrometry; Wastewater
Funding
- National Science Center, Warsaw, Poland [DEC-2013/09/D/ST8/03973]
- Ministry of Science and Higher Education [IP2014 004073]
- Lotos Asfalt, Ltd. (Lotos Group, Inc.)
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The paper presents a new method for the determination of 15 carboxylic acids in samples of postoxidative effluents from the production of petroleum bitumens using ion-pair dispersive liquid-liquid microextraction and gas chromatography coupled to mass spectrometry with injection port derivatization. Several parameters related to the extraction and derivatization efficiency were optimized. Under optimized experimental conditions, the obtained limit of detection and quantification ranged from 0.0069 to 1.12 mu g/mL and 0.014 to 2.24 mu g/mL, respectively. The precision (RSD ranged 1.29-6.42%) and recovery (69.43-125.79%) were satisfactory. Nine carboxylic acids at concentrations ranging from 0.10 mu g/mL to 15.06 mu g/mL were determined in the raw wastewater and in samples of effluents treated by various oxidation methods. The studies revealed a substantial increase of concentration of benzoic acids, in samples of wastewater after treatment, which confirms the need of carboxylic acids monitoring during industrial effluent treatment processes. (C) 2017 Elsevier B.V. All rights reserved.
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