Worldwide, concentrations of PAH vary widely. For example, in a
study of 99 sediment samples taken around the UK between 1993
and 1996, concentrations of phenanthrene, naphthalene and fluorene
reached a maximum of 6.2, 2.4 and 2.3 mg/Kg dry weight, respectively
(Woodhead et al., 1999). Naphthalene concentrations as high
as 120 mg/Kg have been detected at highly contaminated sites,
such as in estuaries and harbours and around drilling platforms