“…Source tracing studies using a low number of congeners have in the past been used to indicate 345 that atmospheric deposition is a major contributor to total PCDD/F fluxes to regions such as 346 the Baltic Sea (Masunaga et al, 2003, Verta et al, 2007and Armitage et al, 2009 PCs (PC1 and PC2) were found to explain >86.9% of the variation in the data (58.5 and 364 28.4%, respectively). A bi-plot of sample scores and vector loadings (see Fig 2) suggest that 365 the ordinance of Burrishoole samples is strongly influenced by OCDD and 1,2,3,4,6,7, HeptaCDD.…”