0f88fb2a-a807-4b96-8854-b6c5bbfef88d eng Licia Guzzella CNR-IRSA Senior researcher 0039392004692 Brugherio (MB) Lombardy 20681 Italy guzzella@irsa.cnr.it 2011-09-06T12:12:09 ISO 19115:2003/19139 1.0 WGS 1984 ORGANIC PERSISTENT TOXIC SUBSTANCES IN SOILS, WATERS AND SEDIMENTS ALONG AN ALTITUDINAL GRADIENT AT MT. SAGARMATHA, HIMALAYAS, NEPAL 2011-09-06T12:05:00 Persistent Organic Pollutants (POPs) and Polycyclic Aromatic Hydrocarbons (PAHs) are important classes of compounds of serious environmental concern. These compounds were measured in waters, sediments and soils from several high altitude sites in the Sagarmatha National Park (Nepal) and included in the Himalayan ridge. In water samples, low-level substituted PCBs and PBDEs, along with more volatile PAHs, were the most common contaminants. In sediment and soil samples, the PCB profile was mainly composed of medium-level chlorinated congeners and significantly correlated with altitude. The PAH profile for water and soil samples showed the main contribution of pyrogenic PAHs due to emissions of solid combustion, whereas the profile for sediments indicated the main contribution of pyrogenic PAHs from gasoline emissions. The PAH levels measured in Himalayan samples must be considered as low to medium contaminated, whereas the regarded Himalayan stations can be considered undisturbed remote areas concerning PCB, PBDE and OC compounds. This investigation represents the first published data on PBDEs and PAHs in high altitude samples collected in the Nepalese Himalayan region, while a number of papers regarding PTS compounds in soils and sediments collected in the Chinese side of the ridge (Kang et al., 2009; Li et al., 2006; Wang et al., 2006, 2008, 2009) have been already published. Licia Guzzella CNR-IRSA Senior Researcher 0039392004692 CNR-IRSA Brugherio (MB) Lombardy 20681 Italy guzzella@irsa.cnr.it thumbnail large_thumbnail water sediment soil persistent organic pollutant World 100000 eng boundaries 80.0522 88.1946 26.3684 30.4247 The information regards water and sediments collected in 2007 and 2008 in lakes and soils collected around the lakes. WWW:LINK-1.0-http--link https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=23389&fname=&access=private WWW:DOWNLOAD-1.0-http--download OGC:WMS-1.1.1-http-get-map