The use of Daphnia magna immobilization tests and soil microcosms to evaluate the toxicity of dredged sediments

Miranda, A, Rodrigues, J, Barata, C, Riva, C, Nugegoda, D and Soares, A 2011, 'The use of Daphnia magna immobilization tests and soil microcosms to evaluate the toxicity of dredged sediments', Journal of Soils and Sediments, vol. 11, no. 2, pp. 373-381.


Document type: Journal Article
Collection: Journal Articles

Title The use of Daphnia magna immobilization tests and soil microcosms to evaluate the toxicity of dredged sediments
Author(s) Miranda, A
Rodrigues, J
Barata, C
Riva, C
Nugegoda, D
Soares, A
Year 2011
Journal name Journal of Soils and Sediments
Volume number 11
Issue number 2
Start page 373
End page 381
Total pages 9
Publisher Springer
Abstract Purpose: This paper evaluates the feasibility of using the buffering capacity of natural soil for the remediation of dredged material before being disposed in soil landfills. To achieve that, an Integrated Soil Microcosms (ISM) system was designed to produce elutriates and leachates from the sediment/soil percentage mixtures. Furthermore, to investigate the biological effects of the contaminated sediments, the toxicity behavior of leachates and elutriates was assessed and compared by performing acute (48 h) toxicity assays with the cladoceran Daphnia magna as test organism. Materials and methods: Sediment samples contaminated with industrial residues were collected in November-December 2007 in a river area under the influence of the effluents from a chlor-alkali industry (Ebro River basin in Flix Reservoir, NE Spain). Uncontaminated natural soil was collected from a pesticide-free field. Particle size, pH, conductivity, total organic carbon, organic matter content, and soil and sediment moisture were determined. Eighty ISM were set up in the laboratory. To each ISM, 3 kg of fresh soil was added to form a 20-cm deep layer. Sediment and soil were mixed in the following proportions: 0:100, 10:90, 20:80, 35:65, and 50:50 (percent sediment/soil). Five hundred grams of the mixtures were placed at the top of each microcosm to form a 10-cm deep layer. The Integrated Soil Microcosm experiment ran for 60 days. Elutriates were obtained at days 1, 7, 14, 30, and 60 while leachates were collected at days 7, 14, and 30. At each sampling time, the toxicity of the extracted elutriate and collected leachate was evaluated by performing D. magna immobilization tests. Results and discussion: From the results, it was apparent that the toxicity of contaminated sediments decreased with the increasing percentage of fresh soil that was added as a buffer. The results also exhibited that the obtained elutriates caused significant mortalities in D. magna at day 1 and day 7, though a slight red
Subject Environmental Sciences not elsewhere classified
Keyword(s) Daphnia magna
Elutriate
Leachate
Natural soil
Sediments
Soil microcosms
DOI - identifier 10.1007/s11368-010-0322-3
Copyright notice © Springer-Verlag 2010
ISSN 1439-0108
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