title: Runoff of genotoxic compounds in river basin sediment under the influence of contaminated soils.
abstract: Contaminated sites must be analyzed as a source of hazardous compounds in the ecosystem. Contaminant mobility in the environment may affect sources of surface and groundwater, elevating potential risks. This study looked at the genotoxic potential of samples from a contaminated site on the banks of the Taquari River, RS, Brazil, where potential environmental problems had been identified (pentachlorophenol, creosote and hydrosalt CCA). Samplers were installed at the site to investigate the drainage material (water and particulate soil matter) collected after significant rainfall events. Organic extracts of this drained material, sediment river samples of the Taquari River (interstitial water and sediment organic extracts) were evaluated by the Salmonella/microsome assay to detect mutagenicity and by Allium cepa bioassays (interstitial water and whole sediment samples) to detect chromosomal alterations. Positive mutagenicity results in the Salmonella/microsome assay of the material exported from the area indicate that contaminant mixtures may have drained into the Taquari River. This was confirmed by the similarity of mutagenic responses (frameshift indirect mutagens) of organic extracts from soil and river sediment exported from the main area under the influence of the contaminated site. The Allium cepa test showed significant results of cytotoxicity, mutagenic index and chromosome aberration in the area under the same influence. However, it also showed the same similarity in positive results at an upstream site, which probably meant different contaminants. Chemical compounds such as PAHs, PCF and chromium, copper and arsenic were present in the runoff of pollutants characteristically found in the area. The strategy employed using the Salmonella/microsome assay to evaluate effects of complex contaminant mixtures, together with information about the main groups of compounds present, allowed the detection of pollutant dispersion routes from the contaminated site to the Taquari River sediment.
authors: Programa de Pesquisas Ambientais, Fundação Estadual de Proteção Ambiental Henrique Luís Roessler, Porto Alegre, RS, Brazil.
authors: Thatiana Cappi
authors: TC
authors: da Costa
authors: Kelly Cristina Tagliari
authors: KC
authors: de Brito
authors: Jocelita Aparecida Vaz
authors: JA
authors: Rocha
authors: Karen Alam
authors: KA
authors: Leal
authors: Maria Lucia Kolowski
authors: ML
authors: Rodrigues
authors: Jean Paolo Gomes
authors: JP
authors: Minella
authors: Silvia Tamie
authors: ST
authors: Matsumoto
authors: Vera Maria Ferrão
authors: VM
authors: Vargas
mesh_terms: D001938:Brazil; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D060587:Groundwater; D007220:Industrial Waste / Q000032:analysis; D009152:Mutagenicity Tests; D009153:Mutagens / Q000032:analysis / Q000633:toxicity*; D045483:Rivers / Q000737:chemistry*; D012475:Salmonella / Q000187:drug effects; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D007220:Industrial Waste; D009153:Mutagens; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical