Trace metals in water and sediment from a tropical watershed subject to anthropogenic inputs

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• 作者：Wendy Nelson
• 关键词：Trace metals ; Pollution ; Tropical watershed ; Water ; Sediment
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：74
• 期：1
• 页码：621-628
• 全文大小：824 KB
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• 作者单位：Wendy Nelson (1)
  
  1. Institute of Marine Affairs, Hilltop Lane, Chaguaramas, PO Box 3160, Carenage Post Office, Trinidad and Tobago, West Indies
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Sixteen stations were established to assess water and sediment quality throughout the Caura/Tacarigua watershed. Samples were analyzed for Cd, Cr, Cu, Fe, Ni, Pb, Zn and Hg using atomic absorption spectrometry during the dry and wet seasons of 2005. In the dry season, Pb and Zn exceeded sediment quality guidelines for the protection of aquatic life. Highest concentrations of all metals were recorded at one station subject to a range of anthropogenic inputs in the lower watershed area; Cu exceeded the water quality guideline at this station. In the wet season, Zn exceeded the SQG at one station located south of residential areas in the lower watershed area and highest concentrations of Cr and Pb were recorded at that station. Metals in water were detected primarily at stations in the lower watershed area. Wet season concentrations of Zn in water were significantly higher than corresponding dry season concentrations. Likely sources of trace metals in the watershed include effluent from a light industrial estate, sewage/domestic waste from non-functioning sewage treatment plants and pit latrines, agricultural and urban runoff. Results of this study show that management strategies using an integrated approach are needed to minimize trace metal pollution within the watershed.