12 
Uj ^LLu, . 
_l_l—1 1 1 1—1—1—l_l—1 hg - 
tj 
t. 
V 
w 
6 7 a <3 10 IS tint« 12 
**1*JjLl 
2 3 4 5 
|JJ 
e 7 8 9 to IS mil-. 12 
2 3 4 a 
2 3 4 5 
s 7 a a io 11 ndn 12 
© 7 S a SO 1 1 mm 12 
Fig. 4: Spill samples from different light fuel spills showing different degrees of weathering. 
The boiling range of about 320 to 400 °C is indicated by two lines (see text). 
The compound cluster given by the mass 216 has proved to be relatively stable and especially 
suitable for comparing light fuel oil samples (Fig. 5). 
Fig. 5: Compound cluster of aromatic compounds of mass 216 (below) in a fresh light fuel 
(left) and the same oil heavily weathered (right). Above: mass-fragment 85.