 A Dutch newspaper reported on this possibility, saying the waste could have been generated as a result of attempted on-board desulfurization (removing mercaptans) of naphtha in a Merox-like process.In this way high mercaptan-laden gasoline is upgraded to meet certain country-specific specifications.This would explain the water/caustic soda/gasoline mix and also the presence in trace amounts of a certain catalyst called ARI-100 EXLz, generally used in this process.