Savinov V.,Akvaplan Niva |
Muir D.C.G.,Environment Canada |
Svetochev V.,RAS Murmansk Marine Biological Institute |
Svetocheva O.,RAS Murmansk Marine Biological Institute |
And 6 more authors.
Science of the Total Environment | Year: 2011
Organochlorine compounds total DDT (ΣDDT), total HCH isomers (ΣHCH), toxaphenes (sum of Parlar 26, 50, 62), mirex, endrin, methoxychlor, total chlorinated benzenes (ΣCBz), total chlordane compounds (ΣCHL), polychlorinated biphenyls (total of 56 congeners; ΣPCBs), polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs), and polybrominated diphenyl ethers (sum of 7 tri- to hepta congeners; ΣPBDEs) were analysed in the blubber of adult ringed seals from the four areas of the Russian Arctic (White Sea, Barents Sea, Kara Sea and Chukchi Sea) collected in 2001-2005. Ringed seals from the south-western part of the Kara Sea (Dikson Island - Yenisei estuary) were the most contaminated with ΣDDTs, ΣPCBs, ΣCHL, and mirex as compared with those found in the other three areas of Russian Arctic, while the highest mean concentrations of ΣHCHs and PCDD/Fs were found in the blubber of ringed seals from the Chukchi Sea and the White Sea, respectively. Among all organochlorine compounds measured in ringed seals from the European part of the Russian Arctic, concentrations of ΣDDT and ΣPCBs only were higher as compared with the other Arctic regions. Levels of all other organochlorine compounds were similar or lower than in seals from Svalbard, Alaska, the Canadian Arctic and Greenland. ΣPBDEs were found in all ringed seal samples analysed. There were no significant differences between ΣPBDE concentrations found in the blubber of ringed seals from the three studied areas of the European part of the Russian Arctic, while PBDE contamination level in ringed seals from the Chukchi Sea was 30-50 times lower. ΣPBDE levels in the blubber of seals from the European part of the Russian Arctic are slightly higher than in ringed seals from the Canadian Arctic, Alaska, and western Greenland but lower compared to ringed seals from Svalbard and eastern Greenland. © 2011 Elsevier B.V. Source
Maslova K.,Center for Environmental Chemistry |
Stepina I.,Center for Environmental Chemistry |
Konoplev A.,Center for Environmental Chemistry |
Popov V.,Center for Environmental Chemistry |
And 4 more authors.
Journal of Environmental Radioactivity | Year: 2013
Kinetics of 137Cs, 60Co and 85Sr sorption on powdered building materials in aqueous suspensions at 20°C for interaction times of 1, 7, 14 and 28 days were studied. The 137Cs distribution coefficient (Kd) values for all building materials except limestone practically did not change during 28 days of sorption. The Kd (85Sr) was several orders of magnitude lower than for 60Co. The highest values were observed for asphalt and granite. An effective method to study the radionuclide distribution in depth of building materials using layer-by-layer sanding was developed. Using the developed method, the 137Cs, 60Co and 85Sr distribution with depth of selected building materials at different air humidity, time and temperature was studied. Relative humidity (RH) was found to influence significantly the 85Sr depth distribution in the case of granite (unlike 137Cs and 60Co). While 85Sr penetrated to 0.5mm in depth of granite at RH 30%, at RH 87% the depth of 85Sr penetration to granite reached up to 7mm. © 2013 Elsevier Ltd. Source