Assessment of sediment mutagenicity in areas under the influence of a contaminated site undergoing a remediation process

Soil contamination enters aquatic ecosystems affecting sediment quality. The region studied is the Taquari River, Brazil, close to a site contaminated by wood preservatives, with a runoff route into the river. The first stage of the remediation process (In this article, the terms intervention and re...

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Bibliographic Details
Published in:Environmental and molecular mutagenesis 2018-08, Vol.59 (7), p.625-638
Main Authors: Gameiro, Paula Hauber, Pereira, Naiara Costa, Rocha, Jocelita Aparecida Vaz, Leal, Karen Alam, Vargas, Vera Maria Ferrão
Format: Article
Language:English
Subjects:
Aquatic ecosystems
Carcinogens
Contaminants
Contamination
Environmental quality
genotoxic compounds runoff
Intervention
Mutagenesis
Mutagenicity
Mutagens
PAHs
Polycyclic aromatic hydrocarbons
Preservatives
Quality assessment
Remediation
Rivers
Runoff
Salmonella
Salmonella/microsome assay
Sediment pollution
Sediments
Soil contamination
Soil pollution
Soil remediation
Water pollution
Wood
Wood preservatives
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Summary:Soil contamination enters aquatic ecosystems affecting sediment quality. The region studied is the Taquari River, Brazil, close to a site contaminated by wood preservatives, with a runoff route into the river. The first stage of the remediation process (In this article, the terms intervention and remediation have been used with slightly different meanings. We consider intervention to be the first phase of the remediation process, which aims to remove active sources) was an intervention to remove the main active sources. The Salmonella/microsome assay and polycyclic aromatic hydrocarbons (PAHs) were used to assess sediment quality in organic extracts during different intervention phases. The strains used were TA98, TA97a, and TA100 with and without S9mix (±S9). The results indicated the presence of pro‐mutagens at site Ta010 (closest to the contaminated site) in all samplings, and the highest result occurred before intervention for TA100 + S9 (1,672 ± 215.9 rev/g). These values decreased during (83 ± 23.6 rev/g) and after this process (403 ± 105.9 rev/g), although the PAHs concentrations increased. Samples from this site presented PAHs with a carcinogenic potential during the assessed periods. After intervention, Ta006 (4 km downstream from Ta010) showed the most significant mutagenesis for TA100 + S9 (764 ± 230.2 rev/g) and, although the total PAHs values were lower, the species considered carcinogenic had higher concentrations. Mutagenesis predicted values of PAHs confirmed that carcinogenic species were predominantly detected by TA100, and the other PAHs by TA97a strains. Marked contaminant release to the river was observed, mainly in Ta010 at different periods. Mutagenicity and PAHs values in an internal stream, upstream from Ta010, showed a dispersion route of these agents. Thus, contamination in Ta010 and possible contribution to Ta006, after intervention, provides a warning regarding environmental quality in the region. Environ. Mol. Mutagen. 59:625–638, 2018. © 2018 Wiley Periodicals, Inc.
ISSN:0893-6692
1098-2280
DOI:10.1002/em.22186