title: Evaluation of genotoxicity and toxicity of water and sediment samples from a Brazilian stream influenced by tannery industries.
abstract: This paper reports results of genotoxicity and toxicity studies of water and sediment samples collected from the Estância Velha stream of southern Brazil, a stream transporting both domestic sewage and effluents from regional factories working in the leather industry. Three sites were selected: in the stream headwaters (Site 1), located downstream of an urban area (Site 2), and near the basin outfall (Site 3). Results obtained with Allium cepa showed no evidence of chromosomal mutation, either in water or in sediment, during winter or summer seasons, but samples collected below Site 1 showed high toxicity. Physical and chemical analyses showed high concentrations of pollutants at these sites. Ecotoxicity tests with Daphnia magna and Ceriodaphnia dubia measured toxicity in water from Sites 2 and 3 in summer 2004. A toxic effect on Hyalella azteca was only found in sediment from Site 3 during winter 2003 and summer 2004. The results suggest that the synergy among different compounds in domestic and industrial sewage discharges can make it difficult to maintain system stability.
authors.affiliation: Centre for Leather Technology, Serviço Nacional de Aprendizagem Industrial, RS, Brazil. hjunior.couro@senairs.org.br <hjunior.couro@senairs.org.br>
authors.forename: Horst Mitteregger
authors.initials: HM
authors.lastname: Júnior
authors.forename: Juliana da
authors.initials: Jd
authors.lastname: Silva
authors.forename: Alexandre
authors.initials: A
authors.lastname: Arenzon
authors.forename: Carina Saraiva
authors.initials: CS
authors.lastname: Portela
authors.forename: Isabel Cristina Fernandes de Sá
authors.initials: IC
authors.lastname: Ferreira
authors.forename: João Antônio Pêgas
authors.initials: JA
authors.lastname: Henriques
mesh_terms: D033304:Amphipoda / Q000187:drug effects; D000818:Animals; D001938:Brazil; D003445:Crustacea / Q000187:drug effects; D003621:Daphnia / Q000187:drug effects; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry; D009152:Mutagenicity Tests; D019697:Onions / Q000187:drug effects; D045483:Rivers / Q000737:chemistry; D012621:Seasons; D013633:Tanning; D018675:Toxicity Tests; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical