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HERO ID
1807980
Reference Type
Journal Article
Title
Bottom sediment as a source of organic contaminants in Lake Mead, Nevada, USA
Author(s)
Alvarez, DA; Rosen, MR; Perkins, SD; Cranor, WL; Schroeder, VL; Jones-Lepp, TL
Year
2012
Is Peer Reviewed?
Yes
Journal
Chemosphere
ISSN:
0045-6535
EISSN:
1879-1298
Publisher
Elsevier BV
Volume
88
Issue
5 (Jul 2012)
Page Numbers
605-611
Language
English
PMID
22464858
DOI
10.1016/j.chemosphere.2012.03.040
Web of Science Id
WOS:000305261900011
Abstract
Treated wastewater effluent from Las Vegas, Nevada and surrounding communities' flow through Las Vegas Wash (LVW) into the Lake Mead National Recreational Area at Las Vegas Bay (LVB). Lake sediment is a likely sink for many hydrophobic synthetic organic compounds (SOCs); however, partitioning between the sediment and the overlying water could result in the sediment acting as a secondary contaminant source. Locating the chemical plumes may be important to understanding possible chemical stressors to aquatic organisms. Passive sampling devices (SPMDs and POCIS) were suspended in LVB at depths of 3.0, 4.7, and 6.7 (lake bottom) meters in June of 2008 to determine the vertical distribution of SOCs in the water column. A custom sediment probe was used to also bury the samplers in the sediment at depths of 0-10, 10-20, and 20-30cm. The greatest number of detections in samplers buried in the sediment was at the 0-10cm depth. Concentrations of many hydrophobic SOCs were twice as high at the sediment-water interface than in the mid and upper water column. Many SOCs related to wastewater effluents, including fragrances, insect repellants, sun block agents, and phosphate flame retardants, were found at highest concentrations in the middle and upper water column. There was evidence to suggest that the water infiltrated into the sediment had a different chemical composition than the rest of the water column and could be a potential risk exposure to bottom-dwelling aquatic organisms.
Keywords
USA, Nevada, Las Vegas Wash; USA, Nevada, Las Vegas; USA, Mead L.; USA, Nevada; Organic compounds in water; Aquatic organisms; Water column; Organic compounds in lake water; Insects; Chemical plumes; Lakes; Recreation areas; Fire retardants; Lake sediments; Contaminants; Effluents
Tags
IRIS
•
Dioxin (2012 Project Page for Final Report)
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