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The identification of a suitable culture organism to establish a bio-assay for
Expanded Title:Sediments act as a source and sink for a variety of organic and inorganic contaminants. These contaminants accumulate, resulting in extremely high concentrations even once the overlying water concentrations are at or below acceptable water quality guidelines. Any changes in the physical parameters of the overlying water can cause these pollutants to be released back into solution. This results in these accumulated contaminants being released in even higher concentrations than previously detected. In recent years sediment contamination has highlighted the need to monitor these previously overlooked pollutant sources that have accumulated in aquatic ecosystems, hence the design of the National Toxicity Monitoring Programme. When the contaminants bound to sediments become toxic they pose a risk both to the aquatic organisms as well as Human health. Some of these pollutants are persistent organic pollutants (POPs). South Africa is a signatory to the Stockholm Convention, and has a responsibility to report on POPs status in the country. South Africa does not currently have standardised methods to assess sediment toxicity. This has led to international protocols being adopted as the norm. These methods are largely untested in South Africa and the organisms needed to conduct these tests are not readily available. There is therefore a strong need to take the international methods and develop standardised ecologically relevant sediment toxicity methods to be used in South Africa. To this end, the initial step will be to select, successfully culture and maintain an indicator organism under controlled laboratory conditions.
Date Published:01/08/2012
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Planning and development, Water Resource Management/IWRM - Water Governance
Document Keywords:Water Quality
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 532/12
ISBN No:978-1-4312-0310-9
Authors:Cloete Y; Shaddock B
Project No:K8/946
Originator:WRC
Organizations:Golder Associates Research Laboratory (Pty) Ltd
Document Size:1 019 KB
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