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Oil Spill identification - Round Robin 20045 
2.12 Waterschap Regge en Dinkel (WRD) 
Contact: A Kroeskamp 
Waterschap Regge en Dinkel www.wrd.nl is a local authority 
responsible for the water quality of an eastern part of the Netherlands. 
The analysis of the total amount of mineral oil in water samples (ISO 
9377) is a routine method, which is also applied to identify the type of 
oil in samples and sometimes to compare samples in case of an oil spill. 
For the analysis GC-FID is used. The analysis with MS, mentioned in the 
conclusions, is beyond the scope of their lab. 
Resulting chromatograms can be found in the original report. 
The results were received by letter in Dutch. Page 1 and 2 contains the 
most relevant information within the framework of this report and has 
therefore been translated, see document Results page 1 and 2 
english.doc on the CD. The original document, including the 
chromatograms, has been scanned into document WRD RR2005.pdf. 
=> 
Comparison of extract 1 and extract 2: 
The fractions C10-C12 and C12-C16 of the extracts 1 and 2 are 
different and are also different from the same fractions of source 1 
and source 2, so the contamination of the canal is not caused by one 
of the sources and are also not related to each other. 
If the difference in percentages of the more volatile fractions is 
caused by evaporation and biological degradation, then the two 
extract samples are comparable and from the same source. 
Contamination in the canal is from source I or source II: 
The source 1 mineral oil percentages in the “more heavier” fractions 
after C20 match very well with the same fractions of extract 1 and 
extract 2. (see shading in table 2) 
Similar properties of the oil chromatograms of extract 1 and 2 en 
source 1; the alkanes of fraction C18-C26 show an irregular 
reduction in peak height. The peak heights of the alkanes of fraction 
C18-C26 of source 2 show a hyperbolic pattern. 
Based on the above-mentioned observations and results (GC/FID) it is 
concluded that source 1 is responsible for the contamination. 
Because the properties of the 4 samples don't show clear differences 
confirmation with MS will be necessary.