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Natural background and anthropogenic inputs of polycyclic aromatic hydrocarbons (PAH) in sediments of South-Western Barents Sea.

Institute of Marine Research, PB 1870 Nordnes, N-5817 Bergen, Norway.
Marine environmental research (Impact Factor: 2.33). 07/2009; 68(5):236-45. DOI: 10.1016/j.marenvres.2009.06.013
Source: PubMed

ABSTRACT Polycyclic aromatic hydrocarbons (PAH) were measured in sediment cores from 13 locations in South-Western Barents Sea as part of a detailed study of the Norwegian seabed under the MAREANO program. The generally low PAH levels found, an average around 200 ng g(-1) dry weight for sum PAH, indicate low inputs of petroleum hydrocarbons to the marine environment in the area. Differences in PAH composition and various PAH ratios indicate a natural, mostly petrogenic origin of PAH in sediments from the open sea locations, while the fjord locations show higher pyrogenic PAH contents with an increase towards upper sediment layers, indicating low inputs from human activities. Petrogenic PAH levels increase in deeper sediments at open sea locations, also when normalised to total organic carbon (TOC) contents, suggesting natural leakages of oil-related hydrocarbons in the area.

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    • "Perylene was separated from other PAHs, because a previous report has represented its biogenic source in surface sediments of the southwest Caspian Sea (Tolosa et al., 2004). To better present the PAH composition trends of petrogenic and pyrogenic origin, Fig. 5 shows the vertical distribution of NPD (sum of Na, DBT, P, and their alkylated homologues) as a petrogenic indicator (Boitsov et al., 2009) and COM (sum of Flu, Py, BaA, Chy, BbF, BkF, BeP, IP and BP) as a pyrogenic indicator (Bouloubassi and Saliot, 1993). The percentage of NPD varied from 27.6% to 83.8% and 35.5% to 91.3% in CR and CA, respectively; whereas, the percentage of COM varied from 8.4% to 60.1% in CR and from 5.3% to 56% at CA. "
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    ABSTRACT: In this study, 75 samples of two 210Pb-dated cores from the southwest of the Caspian Sea were analysed for 30 compounds of polycyclic aromatic hydrocarbons (PAHs). The TPAH29 flux of the last six centuries ranged from 16.3 to 177.3 and 22.3 to 426.2 ng cm−2 y−1 in the Rezvanshahr and Anzali core sediments, respectively. Prior to 1840, four distinct maxima in PAH fluxes (61–426.2 ng cm−2 y−1) with a low weathered petrogenic pattern were found in each of the core sediments. Simultaneity of distinct peaks of PAH fluxes before 1840 and Caspian Sea level high-stands during the Little Ice Age (LIA), revealed the high importance of this phenomenon in washing and transport of land-based oil pollution into the Caspian Sea. An overall increase in some diagnostic ratios (Flu/202, IP/276 and BaA/228), especially after 1940, indicated increase of pyrogenic PAHs as a result of industrial development in the catchment area.
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    • "Viguri et al. studied the relationships between the 16 priority PAHs, the amount of surface sediments and the organic carbon parameters, they reported that a linear relationship existed between the amount of sediments and the availability of organic matter, while the PAHs correlates exponentially with TOC [16]. However, Boitsov et al. found a strong linear relationship between the concentration of PAH and TOC [11]. These types of established relationships are vital for predicting PAH using measured physical parameters. "
    06/2014; 69(2). DOI:10.11113/jt.v69.3119
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    • "In recent decades, a rapid increase in vehicles places great pressure on the environment and has raised concerns among environmentalists in China (Riley, 2002). On the other hand, pyrogenic PAHs in marine environment may also originate from emissions of vessels (Boitsov et al., 2009). The ECS is an important fishing ground (Wong et al., 1998; Gong et al., 2003), as well as a heavily shipping channel (Chen et al., 2005). "
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    ABSTRACT: Polycyclic aromatic hydrocarbons (PAHs) and aliphatic hydrocarbons (AHs) have been quantified for surface sediments collected from the East China Sea (ECS). Our results showed that relatively high levels of PAHs and AHs occurred in both the inner and outer mud areas, while their concentrations at the control site were much lower. AHs for all samples were dominated by the unresolved complex mixture (UCM). Results from diagnostic ratios revealed that sedimentary PAHs were mainly originated from mixed combustion residues of biomass, coal, and petroleum. Combustion residues of petroleum and oil were responsible for the presence of high AHs concentrations. We also conducted factor analysis (FA) to further characterize the PAH and AH sources. Four factors were identified based on the loading of components and attributed to coal and wood combustion (Factor 1), traffic-related sources (Factor 2), petrogenic source (Factor 3) and natural gas combustion (Factor 4).
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