This analysis is a control procedure to determine background levels of the test chemical in untreated wood to confirm that the wood used as a source of samples had not been previously treated with the preservative.
Oetken, M, Nentwig, G., Löffler, D, Ternes, T. et J. Oehlmann (2005), Effects of pharmaceuticals on aquatic invertebrates, Part I, The antiepileptic drug carbamazepine, Arch.