PMID: 16519322Mar 8, 2006Paper

Application of toxicity identification evaluation to sediment in a highly contaminated water reservoir in southeastern Brazil

Environmental Toxicology and Chemistry
Rosalina P A AraújoAntonio A Mozeto

Abstract

Rasgão Reservoir, located close to the Metropolitan region of São Paulo, Brazil, has been analyzed previously, and its sediment was found to be highly toxic, with high levels of metals and polycyclic aromatic hydrocarbons and a complete absence of benthic life. Polychlorinated biphenyls also were present, as was mutagenic activity, detected with the Salmonella/microsome assay. Because of the extremely complex mixture of contaminants in these sediments, a toxicity identification evaluation was performed on the pore water and elutriate using Ceriodaphnia dubia and Vibrio fischeri. Toxicity characterization, identification, and confirmation procedures were performed in one representative sample of the reservoir, and the results indicated that ammonia was the main cause of the toxicity detected with C. dubia in both sediment pore water and elutriate. Chemical analysis corroborated this observation by revealing un-ionized ammonia concentrations as high as 5.14 mg/L in pore water and 2.06 mg/L in elutriate. These high ammonia levels masked possible toxicity caused by other classes of compounds. The toxicity detected with V. fischeri decreased with the time of sample storage and was related to the organic fraction of the pore water an...Continue Reading

Citations

Mar 7, 2012·Environmental Monitoring and Assessment·Edward R LongMargaret Dutch
Oct 1, 2013·Environmental Monitoring and Assessment·Antonio A MozetoBias M de Faria
Apr 28, 2016·Environmental Monitoring and Assessment·Sheila Cardoso-SilvaMarcelo Pompêo
Oct 21, 2016·Environmental Science and Pollution Research International·A C RietzlerA L Fonseca
Feb 24, 2011·Toxicology and Industrial Health·Temitayo I AkinbolaChibuisi G Alimba
Apr 15, 2010·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Felix Torres-GuzmanRoberto Rico-Martinez
Jun 28, 2019·Bulletin of Environmental Contamination and Toxicology·Gabrielle R QuadraFábio Roland

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