Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/120311
Author(s): | Couto C.M.C.M. Ribeiro C. Maia A. Santos M. Tiritan M.E. Ribeiro A.R. Pinto E. Almeida A. |
Title: | Assessment of Douro and Ave River (Portugal) lower basin water quality focusing on physicochemical and trace element spatiotemporal changes |
Publisher: | Taylor & Francis |
Issue Date: | 2018 |
Abstract: | Water quality of Douro and Ave lower basin was evaluated regarding physicochemical parameters (pH, conductivity, dissolved oxygen and temperature), nutrient compounds (nitrates, nitrites, ammonium and orthophosphates), chlorophyll a and occurrence of trace elements (Li, Be, Al, Ti, V, Cr, Co, Ni, Cu, Zn, Se, Mo, Ag, Cd, Sb, Ba, Tl, Pb, Th and U). To study spatiotemporal variations and possible anthropogenic sources, estuarine samples were collected at nine sampling sites in Douro and five in Ave distributed along the estuaries at four sampling campaigns (spring, summer, fall and winter). According to the water quality standards for aquatic life and recreation, Douro and Ave river water quality was found out of safe limits regarding several parameters. Nitrate levels were systematically high (> 50 mg L−1 in a significant number of samples) and mean levels of trace elements were higher than the established values of Canadian Environmental Quality Guidelines for aquatic life protection for Al, Cu, Se, Ag, Cd and Pb in Douro and Ave, and also Zn in Ave. Significant spatial differences were found in Ave river estuary for trace elements with a clear trend for higher values from upstream to downstream found. Seasonal differences were also observed particularly in Douro river estuary with higher levels in spring for most elements. © 2018, © 2018 Taylor & Francis Group, LLC. |
Subject: | Biochemical oxygen demand Dissolved oxygen Estuaries Nitrates Trace elements Water quality Douro and Ave lower basin Environmental Monitoring ICP-MS Physicochemical parameters River water Spatio-temporal changes Spatio-temporal variation Water quality standard Rivers aluminum antimony cadmium chlorophyll a chromium cobalt copper lead lithium molybdenum nickel nitrate nitric acid derivative nitrite phosphate river water selenium silver thallium thorium titanium trace element uranium vanadium zinc fresh water trace element Article conductance estuary nonhuman nutrient physical chemistry Portugal river salinity seasonal variation water quality water standard water temperature analysis chemical phenomena chemistry drug effect environmental monitoring human pharmacokinetics procedures river season time factor water pollutant Chemical Phenomena Environmental Monitoring Estuaries Fresh Water Humans Portugal Rivers Seasons Time Factors Trace Elements Water Pollutants, Chemical Water Quality |
URI: | https://hdl.handle.net/10216/120311 |
Source: | Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering, vol. 53(12), p. 1056-1066 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | CIIMAR - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
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Couto CMCM_2018.pdf Restricted Access | 1.56 MB | Adobe PDF | Request a copy |
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