| Title: | Persistent organic pollutant accumulation in seasonal snow along an altitudinal gradient in the Tyrolean Alps |
| Author(s): | Arellano L; Grimalt JO; Fernandez P; Lopez JF; Nickus U; Thies H; |
| Address: | "Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona, 18, 08034, Barcelona, Catalonia, Spain" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-014-3196-x |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "The snow capacity for storage of a large number of pollutants such as polybromodiphenyl ethers (PBDE), including BDE-209, polycyclic aromatic hydrocarbons (PAHs), polychlorobiphenyls (PCBs), hexachlorocyclohexanes (HCHs; alpha- and gamma-isomers), endosulfans (alpha- and beta-isomers and the sulphate residue) and hexachlorobenzene (HCB), in a steep altitudinal gradient (1,101-2,500 m above sea level (asl); maximum planar distance 16 km) in a typical European mountain system, the Tyrolean Alps (Austria), was studied here for the first time. Snow samples representing the whole snowpack accumulated at the end of the cold season were collected in all cases. The snow specific surface area (SSA) of these samples, 140-260 cm(2) g(-1), was characteristic of aged snow with low retention capacity. PAHs were the pollutant group in highest concentrations (500-8,400 pg L(-1)). PCBs and PBDEs were found in concentrations of 460-900 and 8.5-290 pg L(-1), respectively. From the fourteen investigated BDE congeners, only BDE-47, BDE-99, BDE-100 and BDE-209 were found above the detection limit, which is consistent with the results found in the only previous study in the Tatra Mountains (Slovakia) which also involved a steep gradient (1,683-2,634 m asl; maximum planar distance 5 km; Arellano et al. 2011) and confirm the capacity of these low-volatile compounds for long-range transport from distant sources. HCB was found in a concentration range of 34-55 pg L(-1). Snow deposition fluxes of PCB-118, PCB-153, gamma-HCH, alpha-endosulfan and BDE-47 showed statistically significant correlations with altitude, involving higher values at higher elevation. This trend may reflect cold trapping effects in view of the snow particle contents and SSA values. However, these gradients were only significant for this limited number of compounds within each pollutant group which may be explained by differences in physical-chemical properties of the compounds and the limited capacity of the aged snow for organic pollutant retention. In some other cases, for example benzo[a]pyrene, the observed vertical gradients may reflect higher preservations at lower temperatures" |
| Keywords: | "Altitude Endosulfan/analysis Environmental Monitoring Environmental Pollutants/*analysis Hexachlorocyclohexane/analysis Hydrocarbons, Aromatic/analysis Seasons Snow/*chemistry;" |
| Notes: | "MedlineArellano, Lourdes Grimalt, Joan O Fernandez, Pilar Lopez, Jordi F Nickus, Ulrike Thies, Hansjoerg eng Research Support, Non-U.S. Gov't Germany 2014/06/25 Environ Sci Pollut Res Int. 2014 Nov; 21(22):12638-50. doi: 10.1007/s11356-014-3196-x. Epub 2014 Jun 25" |
