Diffuse sources of pollution and their influence on the nature of the sediments in Água Preta Lake

Maria Lourdes Souza Santos, Rosiane Rosário Sousa, José Almir Rodrigues Pereira, Jaqueline Portal da Silva, Mauricio William Lima

Resumo


Sediments in aquatic systems are indicators of contamination levels. Therefore, they play an important role in the assessment of the nature and intensity of human impact on aquatic environments. The objective of this work was to assess the levels of pollution by determining the concentrations of various metals and phosphorus forms in the sediments of Água Preta Lake, which supplies water to the Metropolitan Region of Belém, in north-eastern Brazil. Our data indicate non-uniform sedimentation with a large granulometric fraction of silt. The predominant form of phosphorus was inorganic phosphorus, to the detriment of the organic form. Observed mean concentrations of nickel, copper, lead, and zinc were lower than the PEL (Probable Effect Level). However, the highest observed concentrations of nickel and lead exceeded the prescribed TEL (Threshold Effect Level), which suggests pollution from an anthropogenic source.

 


Palavras-chave


trace elements; phosphorus; contamination.

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DOI: http://dx.doi.org/10.4025/actascitechnol.v37i2.25745





ISSN 1806-2563 (impresso) e ISSN 1807-8664 (on-line) e-mail: actatech@uem.br

  

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