Gas chromatography-mass spectrometry analysis of alkylphenols in produced water from offshore oil installations as pentafluorobenzoate derivatives.
A simple, highly selective and sensitive method for the determination of 14 representative alkylphenols from phenol (C0) to nonylphenol (C9) in produced water is described. Solid-phase extraction (SPE) by anion-exchange sorbent is used to extract alkylphenols from produced water. The samples are then derivatised by pentafluorobenzoyl chloride and analysed on GC-MS (negative ion chemical ionisation, NCI). The derivatisation procedure has been validated by means of two-level factorial design (2(7-4)) experiments. Quantification is done with isotope dilution of five internal standards of different alkyl chain length. The detection limits were at low ng/l levels. A comparison with GC-MS analysis of non-derivatised alkylphenol samples revealed the advantage of derivatisation as described in the method.
Boitsov
Stepan
S
Institute of Marine Research, Post Box 1870 Nordnes, Bergen 5817, Norway. stepan.boitsov@imr.no
Meier
Sonnich
S
Klungsøyr
Jarle
J
Svardal
Asbjørn
A
D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010578:Petroleum; D010636:Phenols / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D010578:Petroleum; D010636:Phenols; D014874:Water Pollutants, Chemical