The use of two microbiotests to evaluate the toxicity of sediment from Mpumalanga, South Africa

Rapid urbanisation throughout the world has resulted in numerous ecological and environmental problems. The release of contaminants into the aquatic environment and the subsequent accumulation in sediment is a specific area of concern due to the potential re-release of the contaminants into solution...

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Bibliographic Details
Published in:Water S. A. 2017-07, Vol.43 (3), p.409-412
Main Authors: Nel, A., Cloete, Y.C., Shaddock, B.F.
Format: Article
Language:English
Subjects:
Acute toxicity
Analysis
Aquatic environment
Bioassays
Chemical analysis
Chemicals
Coal mining
Contaminants
Contaminated sediments
Contamination
Ecological effects
Effluents
Environmental impact
Flowers & plants
Growth
Guidelines
Inhibition
Laboratories
Microbiological research
Ostracodtoxkit F
Phytotoxkit
Pollutants
Sediment
Sediment contamination
Sediments
Sediments (Geology)
Soil contamination
Studies
Toxicity
Upstream
Urbanization
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Summary:Rapid urbanisation throughout the world has resulted in numerous ecological and environmental problems. The release of contaminants into the aquatic environment and the subsequent accumulation in sediment is a specific area of concern due to the potential re-release of the contaminants into solution. The responses of two microbiotests designed to evaluate sediment toxicity (the Ostracodtoxkit F and Phytotoxkit test) were compared once exposed to three samples collected in the vicinity of a power station in Mpumalanga, South Africa. Sediment characterisation and chemical analyses were conducted in order to determine possible correlations with the expressed results. Where possible, the concentration of chemicals in the sediment was compared to available sediment guidelines. The study showed that whilst the Phytotoxkit test results did not indicate any acute toxicity (< 50% inhibition), the Ostracodtoxkit F test indicated 100% mortality at the upstream site, with increased growth inhibition at the remaining two sites. The concentration of chrome at all three sites exceeded the interim sediment quality guidelines (37 mg/kg), with the sample collected at the upstream site exceeding the probable effect level (90 mg/kg). The findings from this study indicated that the Phytotoxkit and Ostracodtoxkit F test kits are sensitive enough to evaluate sediment toxicity.
ISSN:0378-4738
0378-4738
DOI:10.4314/wsa.v43i3.05