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Sediment quality in Rio Guadiamar (SW, Spain) after a tailing dam collapse: contamination, toxicity and
Inmaculada Riba1, T Angel Delvalls, Trefor B Reynoldson
1Instituto de Ciencias Marinas de Andalucía, CSIC, Polígono río San Pedro s/n, Puerto Real, Cádiz, Spain.
Environment International
|July 6, 2006
Summary
A mining spill contaminated the Guadiamar River, impacting sediment quality. Metals like zinc and cadmium were identified as the primary cause of toxic effects on aquatic life.
Area of Science:
- Environmental Science
- Ecotoxicology
- Geochemistry
Background:
- Accidental mining spills can severely impact riverine ecosystems.
- Sediment quality is a critical indicator of aquatic health following pollution events.
Purpose of the Study:
- To assess sediment quality in the Guadiamar River post-mining spill.
- To determine the bioavailability and toxicity of metals in affected sediments.
Main Methods:
- Measured metal concentrations and conventional parameters in river sediments.
- Conducted four standard sediment toxicity tests using various aquatic invertebrates.
- Analyzed geochemical fractions of six key metals (Fe, Mn, Zn, Cu, Pb, Cd) to assess bioavailability.
Main Results:
- Sediment metal concentrations, particularly zinc and cadmium in mobile fractions, were elevated.
- Toxicity test results indicated adverse effects on aquatic organisms.
- Geochemical analysis linked sediment toxicity to mobile fractions of zinc and cadmium, originating from the spill.
Conclusions:
- The mining spill significantly altered Guadiamar River sediment quality.
- Zinc and cadmium in mobile sediment fractions are the main contributors to observed ecotoxicity.
- The study highlights the importance of assessing metal bioavailability in understanding pollution impacts.
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