Ecotoxicity assessment of boreal lake sediments affected by metal mining : Sediment quality triad approach complemented with metal bioavailability and body residue studies

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Kristiina Väänänen, Sebastian Abel, Tähti Oksanen, Inna Nybom, Matti T. Leppänen, Harri Asikainen, Maj Rasilainen, Anna K. Karjalainen, Jarkko Akkanen. Ecotoxicity assessment of boreal lake sediments affected by metal mining: Sediment quality triad approach complemented with metal bioavailability and body residue studies. Science of The Total Environment 662 (2019), pages 88-98, ISSN 0048-9697. https://doi.org/10.1016/j.scitotenv.2019.01.209

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Title: Ecotoxicity assessment of boreal lake sediments affected by metal mining : Sediment quality triad approach complemented with metal bioavailability and body residue studies
Author: Väänänen, Kristiina; Abel, Sebastian; Oksanen, Tähti; Nybom, Inna; Leppänen, Matti T.; Asikainen, Harri; Rasilainen, Maj; Karjalainen, Anna K.; Akkanen, Jarkko
Publisher: Elsevier
Date: 2019
Language: en
Belongs to series: Science of The Total Environment 662 (2019), 88-98
ISSN: 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2019.01.209
URI: http://hdl.handle.net/10138/340853
Abstract: There are several methods for studying metal-contaminated freshwater sediments, but more information is needed on which methods to include in ecological risk assessment. In this study, we compliment the traditional Sediment Quality Triad (SQT) approach – including information on chemistry, toxicity and ecological status – with studies on metal bioavailability and metal body residues in local organisms. We studied four mining-affected boreal lakes in Finland by conducting chemical analyses of sediment and water, toxicity tests (L. variegatus, V. fischeri, C. riparius, L. stagnalis), and analysis of benthic organism community structure. In addition, we studied the relationships between metal loading, toxicity, metal bioavailability, and metal body residues in the field-collected biota. Chemistry and benthic organism community structures show adverse effects in those lakes, where the metal concentrations are the highest. However, toxicity was connected to low sediment pH during the experiment, rather than to high metal concentrations. Toxicity was observed in 4 out of 6 toxicity tests including growth test with L. variegatus, bulk sediment test with V. fischeri, and the L. stagnalis toxicity test. The C. riparius test did not show toxicity. Metal body residues in biota were not high enough to induce adverse effects (0.1–4.1 mg Cu/kg fw, 0.01–0.3 mg Ni/kg fw, 2.9–26.7 mg Zn/kg fw and 0.01–0.7 mg As/kg fw). Chemical analyses, metal bioavailability assessment and benthic community structures survey revealed adverse effects in the sediments, where metal concentrations are highest (Lake SJ and Lake KS). Standard toxicity tests were not suitable for studying acid, sulfide-rich sediments and, therefore, benthic structure study and chemical analyses are believed to give more reliable results of the ecological status of these sediments.
Description: Highlights • Ecological risk assessment of metal-contaminated boreal lakes and sediments. • Sediment Quality Triad complemented with bioavailability and body residue studies. • Toxicity studies for natural sediments with several organisms and endpoints • Adverse effects observed. High variation on results between different methods. • Standard toxicity tests not suitable for testing, too low pH hampers the results.
Subject: sediment
metal
ecological risk assessment
triad
bioavailability
body residue
ecotoxicity
boreal lakes
boreal lake sediments
mining
metal mining
quality
triad approach
metal bioavailability
body residue
body residue studies
1172 Environmental sciences
218 Environmental engineering
Subject (ysa): sedimentit
metallit
järvet
biosaatavuus
ekotoksikologia
jäämät
riskianalyysi
kaivosvesi
vesien saastuminen
1172 Ympäristötiede
218 Ympäristötekniikka


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