Organochlorine residues analysed in invertebrates of the Dutch Wadden Sea by two methods

Abstract

Two laboratories analysed 12 organochlorine compounds in the same and parallel samples of 3 invertebrate species ( Cerastoderma edule, Mya arenaria, Crangon crangon) obtained from the western Dutch Wadden Sea in 1976. The two different analytical methods used resulted in very similar mean residue levels. These levels deviated in only 2 out of 16 cases by more than 50%. The PCB levels predominated with 20 to 100 ng·g −1, and were higher than those of the same species from the Weser estuary, Germany. The other compounds ranged generally below 6 ng·g −1.