17 
Oil Spill identification - Round Robin 20045 
2.Individual results 
In this chapter a summary of the results of each participant will be 
given. All original results, separated in directories, can be found on the 
CD. 
Each participant is introduced shortly and the method(s) used to 
analyze the samples are summarized. The conclusion, indicated with the 
=> sign, is an exact copy of the conclusion found in the original report. 
Finally for some of the participants additional notes/remarks can be 
found. In annex 6.2 a summary of the analytical protocols is shown. 
2.1 Beheerseenheid Mathematisch Model van de 
Noordzee (BMM) 
Contact: Patrick Roose 
The institute uses three abbreviations depending on the language. See 
http://www.mumm.ac.be/ 
In English: The Management Unit of the North Sea Mathematical 
Models and the Scheldt estuary, abbreviated to MUMM, is a 
department of the Royal Belgian Institute of Natural Sciences (RBINS), a 
federal scientific establishment that comes under the Federal Science 
Policy (previously known as OSTC). 
The samples were analyzed with GC-FID and GC-MS according to the 
standard procedure that is largely based on the revised Nordtest 
Methodology as described in Faksness et al. (2002). Normally, 
approximately 50 mg of oil is dissolved in 5ml dichloromethane (DCM) 
and the removal of co-extracted material prior to GC-MS analysis is 
carried out by column chromatography on a silicagel column 
(pretreated at 150°C for 24h). 
=> The FID patterns of source 1 and 2 (Figure 1) show, in both cases, a 
mixture of a heavy fuel oil and lubricants, as do the patterns of the spill 
samples (Figure 2). Source 2 was omitted from further investigation based on 
the FID chromatogram and the MS Total ion chromatogram. 
Although neither of the samples could be unequivocally related to source 1 
based on this comparison, the patterns are very similar. This is illustrated in 
Figure 10. This would make source 1 the likely candidate for the spill if the 
presence of other potential sources can be excluded. The observed differences 
can be related to weathering and sample inhomogeneity. 
Notes/remarks: 
A mixture of a heavy fuel oil and lubricants should be a mixture of gas oil and 
lubricants 
The GC-FID chromatograms of the source samples have a strange 
pattern. Only the beginning of the chromatograms shows normal