In the 2nd paragraph, 2nd sentence, replace , and mixtures of bilge and sludge samples with , sludge samples, and mixtures of bilge to read: Examples are: crude oils, higher boiling condensates, diesel oils, residual bunker or heavy fuel oils, lubricants, sludge samples, and mixtures of bilge, as well as distillate fuels and blends . In the 1st sentence of the last paragraph, after matrices , add (e.g. contaminated feathers, plants, rocks, sand) to read: When analysing non-oil matrices (e.g. contaminated feathers, plants, rocks, sand) additional sample preparation (e.g. clean-up) is often required prior to analysis and the extent to which the matrix affects the correlation achieved is to be considered .