transparent gif


Ej inloggad.

Göteborgs universitets publikationer

Evaluation of the influence of black carbon on the distribution of PAHs in sediments from along the entire Swedish continental shelf

Författare och institution:
Laura Sánches-García (-); Ingemar Cato (-); Örjan Gustafsson (-)
Publicerad i:
Marine Chemistry, 119 ( 1-4 ) s. 44-51
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
A growing literature is proposing that combusted-derived black carbon (BC) is dominating the sorption and, by inference, the environmental distribution and bioavailability of many hydrophobic pollutant classes. Yet, there is a paucity of studies evaluating simultaneously the distribution of both BC geosorbents and pollutant sorbates in the actual field. Here, 120 surface sediments collected by the Geological Survey of Sweden along the 2000 km continental shelf along the Swedish coast facilitated evaluation of the relative influences of BC and non-BC organic carbon (OC) on the spatial distribution of polycyclic aromatic hydrocarbons (PAHs). The sum of 15 out of the 16 EPA PAHs ranged from 0.12 to 9.6 μg/g dry weight (dw), with the highest levels being found in the southern half of the Swedish Shelf (SS) area and in the vicinity of larger cities (Stockholm, Göteborg, Malmö and Umeå). Source-diagnostic PAH ratios such as ANT/(PHE+ANT), FLT/(FLT+PYR), BaA/(BaA+BPE), IPY/(IPY+BPE), CombPAH/ΣPAH and LMW/HMW suggested that pyrogenic sources are dominating the load of PAHs in Swedish Baltic and North Sea sediments. The sediment TOC was 4.8-168 mg/gdw (median 43 mg/gdw), while a BC concentration of 0.6-18 mg/gdw (median 1.8 mg/gdw) yielded BC:TOC ratios spanning a wide range of 1.7-47 % (median 4.6 %). Empirical distribution function tests disqualified linear regression statistics. Instead, evaluation with the non-parametric Spearman function yielded higher correlation coefficient (rS) for total PAHs versus BC (0.54, p<0.01) than versus either TOC (0.28, p<0.01) or OC (TOC-BC; 0.26, p<0.01). The results from this field study, encompassing an order of magnitude more observations than any previous sediment study, is a broad field manifestation of the importance of BC in affecting the distribution of planar aromatic pollutants in aquatic environments.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
Black carbon, Polycyclic aromatic hydrocarbons, Sorption, Marine sediments
Postens nummer:
Posten skapad:
2010-02-17 11:56
Posten ändrad:
2011-11-29 12:10

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007