Concentration and Distribution of Naphthenic Acids in the Produced Water from Offshore Norwegian North Sea Oilfields

Concentration and Distribution of Naphthenic Acids in the Produced Water from Offshore Norwegian North Sea Oilfields

Naphthenic acids (NAs) constitute one of the toxic components of the produced water (PW) from offshore oil platforms discharged into the marine environment. We employed liquid chromatography (LC) coupled to high-resolution mass spectrometry with electrospray ionization (ESI) in negative mode for the...

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Bibliographic Details
Published in:Environmental science & technology 2020-03, Vol.54 (5), p.2707-2714
Main Authors: Samanipour, Saer, Reid, Malcolm J, Rundberget, Jan Thomas, Frost, Tone K, Thomas, Kevin V
Format: Article
Language:eng
Subjects:
Acids
Carboxylic Acids
Correlation coefficient
Correlation coefficients
Homology
Ionization
Ions
Liquid chromatography
Marine environment
Mass spectrometry
Mass spectroscopy
Naphthenic acids
North Sea
Offshore
Offshore drilling rigs
Offshore platforms
Oil and Gas Fields
Oil fields
Principal components analysis
Water
Water Pollutants, Chemical
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Summary:Naphthenic acids (NAs) constitute one of the toxic components of the produced water (PW) from offshore oil platforms discharged into the marine environment. We employed liquid chromatography (LC) coupled to high-resolution mass spectrometry with electrospray ionization (ESI) in negative mode for the comprehensive chemical characterization and quantification of NAs in PW samples from six different Norwegian offshore oil platforms. In total, we detected 55 unique NA isomer groups, out of the 181 screened homologous groups, across all tested samples. The frequency of detected NAs in the samples varied between 14 and 44 isomer groups. Principal component analysis (PCA) indicated a clear distinction of the PW from the tested platforms based on the distribution of NAs in these samples. The averaged total concentration of NAs varied between 6 and 56 mg L–1, among the tested platforms, whereas the concentrations of the individual NA isomer groups ranged between 0.2 and 44 mg L–1. Based on both the distribution and the concentration of NAs in the samples, the C8H14O2 isomer group appeared to be a reasonable indicator of the presence and the total concentration of NAs in the samples with a Pearson correlation coefficient of 0.89.
ISSN:0013-936X
1520-5851