The graph below (courtesy of the University of Waikato) shows
the profile of compounds present in an oil slick sample collected
1.5 km south of the Rena on the 13th October. Straight chain
hydrocarbon peaks are labelled. Other hydrocarbons and polyaromatic
hydrocarbons (PAH's), including naphthalene and methyl naphthalenes
(*) are interspersed
The chemical structure of some PAH's is shown below.