| application of toxicity identification evaluation to sediment in a highly contaminated water reservoir in southeastern brazil. | 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 pe ... | 2006 | 16519322 |