UNESCO is currently implementing the third phase of the project “Governance of Groundwater Resources in Transboundary Aquifers” (GGRETA-3). In the Read more
Consultancy Call for Application: Strengthening Groundwater Governance and Data Collection and Reporting
Job Opportunities : Integrated Transboundary River Basin Management for the Sustainable Development of the Limpopo River Basin
The Global Water Partnership Southern Africa (GWPSA) is pleased to invite candidates to submit their applications for the positions of Read more
2020-2021 Orange-Senqu Surface Water Quantity Synoptic Analysis
Welcome to the first surface water quantity report of the Orange-Senqu River Commission (ORASECOM), for the hydrological year 2020-2021. For Read more
Khakea-Bray Transboundary Dolomite Aquifer Recharge Assessment
Documentation and Data: A read-only folder structure of all reports, data, and models related to the STAS can be accessed Read more
- WIS > Biota and Ecosystems > POPs, PAHs and elemental levels in sediment, fish and wild bird eggs in the Orange–Senqu River Basin
POPs, PAHs and elemental levels in sediment, fish and wild bird eggs in the Orange–Senqu River Basin
Four southern African countries, Lesotho, South Africa, Botswana, and Namibia share the basin of the Orange-Senqu River and are Parties to the Stockholm Convention (SC) on Persistent Organic Pollutants (POPs). Currently, the SC targets 21 chemicals and classes of chemicals. Previously, the research in the Orange-Senqu Basin on POPs concentrated on pesticide POPs such as DDT. Only recently has more attention been given to POPs such as dioxins and PBDEs. Almost nothing is known about PAHs in the catchment, except for a recent Water Research Commission survey.
There are also very few studies available on elemental levels in sediments. This study undertook a survey and assessment of POPs and heavy metals in water bodies and riverine sediments as contribution to the Transboundary Diagnostic Analysis (TDA) of the orange-Senqu River Basin. During the study, polycyclic aromatic hydrocarbons (PAHs) were added as additional research
topic. The entire Orange-Senqu River catchment was targeted for sediment collection and 61 sites were sampled in South Africa in September 2010. Of the 61 sites, 33 were in the Vaal River catchment. The remaining 28 sites were Orange-Senqu River sites that did not drain into the Vaal River. One site was in Namibia and five from Lesotho. These sites largely conform to the sites used
by other components of the TDA. Fish and wild bird eggs were sampled in South Africa to investigate the levels of the compounds and elements in the biota of the Orange-Senqu River Basin.
- Bouwman, H, et al. 2010. 2010 Joint Orange–Senqu survey of persistent organic pollutants and heavy metals: Survey design report. Technical Report Number 2.
- Bouwman, H, et al. 2011a. POPs and elemental levels in sediment, fish and wild bird eggs: Interim report. Technical Report Number 12.
- Bouwman, H, et al. 2011b. POPs, PAHs and elemental levels in sediment, fish and wild bird eggs in the Orange–Senqu River basin: Final report. [Published as ORASECOM Report 002/2013] Technical Report Number 15.