Fourier Transform Infrared Spectroscopy and Solid Phase Extraction Applied to the Determination of Oil and Grease in Water Matrices |
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Authors: | Núria Ferrer M Teresa Romero |
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Institution: | (1) Serveis Cientificotècnics, Universitat de Barcelona, Lluís Solé i Sabarís, 1, E-08028 Barcelona, Spain, ES |
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Abstract: | The solid phase extraction as a solvent-free method for the analysis of oil and grease in waters was studied. The use of
a PTFE surface as a solid phase allows the retention of the volatile fraction of oil and grease, and further analysis of carbon–hydrogen
bonds using infrared spectroscopy can be done on the surface.
Various oils and grease samples were tested: n-hexadecane, n-tetradecane, n-nonadecane, n-docosane, isooctane, diesel oil
and gasoline. Temperatures from 25° to 90 °C and a range of heating times were checked for extraction.
Precision tests showed relative standard deviation values of around 10% in several samples of the same concentration. Calibration
lines of n-hexadecane showed high correlation coefficients from 0.9 to 30 mg/l. Recoveries for the various oils using different
calibration lines showed values from 90 to 110%.
The method described here is fast and clean, and allows reproducible measurements of oil and grease in water that do not require
the use of a solvent.
Received March 1, 2001; accepted August 15, 2001; published online July 15, 2002 |
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Keywords: | : Solid phase extraction infrared spectroscopy oil and grease analysis |
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