Preliminary Non-Targeted Screening of Organic Compounds linked with Elemental Analysis of Marine Sediments near Salmon Farms
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- Institutt for kjemi 
Sediment samples from the vicinity of two active salmon farms in central west Norway (Smøla, Møre og Romsdal) have been analyzed for elements, organic compounds and physio-chemical parameters. Elements have been analyzed by ICP-MS, while organic compounds were characterized through non-targeted screening by GC-MS. Physio-chemical parameters included grain size distribution, total organic matter (TOM), pH and conductivity. Totally, the study included 52 samples for organic analysis and 37 samples for elemental analyses from 24 locations, approximately 100 m to 1 km from the perimeter edge of the installations. Concentrations of trace elements suggested background (Class I) or good (Class II) conditions according to Norwegian marine sediment quality classification. However, by considering total organic carbon (TOC) content, most samples classified as very bad (Class V) near installation A (Hestøya) and bad (Class IV) near installation B (Nørholmen). Lead (Pb) contents were significantly higher near installation B, while cadmium (Cd), arsenic (As) and antimony (Sb) were significantly higher near installation A (p < 0.05). Further, Cd, aluminum (Al), tin (Sn), chromium (Cr), iron (Fe) and manganese (Mn), showed elevated concentration closer than 500 m from the installations compared with distances above 500 m. However, negative correlations with distances from the installations were only confirmed for Fe, Mn and Al by Spearman correlations and Principal Component Analysis (PCA). On the other hand, the highest concentrations were found at intermediate distances (200-500 m) for Cd, Cr, Sn, TOM and pelite (grain size < 0.06 mm) contents...