Disponibilidade e toxicidade de cádmio no Ribeirão Cafezal Londrina-PR

Abstract

The quality of water and river sources are important factors to be considered by society. With population growth and, as a consequence, intensification of industrialization, the production of domestic and industrial effluents increased. These effluents may contain potentially toxic metals, which in turn are essential for the development and maintenance of organisms, but if ingested at high concentrations they may be toxic. The region of the Ribeirão Cambé Basin crosses the urban area of Londrina (PR), as a consequence suffers from many impacts, due to the proximity of residences, roads, trade and various other human activities, irregular garbage disposal, lack of riparian forest. All these impacts generate waste and effluents that end up stopping in or around the bed. In this context, this study aimed to verify if the potentially toxic metal (Cadmium) is available and at levels toxic to fish in the ecosystem. Three fish and water samples were collected at 3 points along the upper section of the Ribeirão Cafezal basin, using manual and electric fishing, with a sampling effort of 40 minutes each. Thirty-eight individuals from 7 different species were used between December 2014 and April 2015. The analysis of the detection of potentially toxic metals in UTFPR, Campus Apucarana, was carried out. The concentrations presented were above the limit allowed by ANVISA for fish (0.05 mg / kg). The concentrations of metals did not show significant variations between the sampling points evaluated. Since Ribeirão is used by people for recreation and fishing, it is necessary to continue the monitoring activity, analyzing periodically, identifying sources of pollution and alerting the population about the danger of ingesting potentially toxic metals.