Phosphorus and nitrogen in waters of the ocoí river sub-basin, Itaipu reservoir tributary

Journal of the Brazilian Chemical Society

Gilmar S. Da Silva²  Gilberto S. Da Silva¹  Eliane R. De Sousa¹  Cristiane Konrad¹  Carla C. Bem¹  Janaína Pauli¹  Adilson Pereira¹ 

[1] ,Instituto Federal de Educação, Ciência e Tecnologia do Maranhão Departamento Acadêmico de Química São Luís MA ,Brazil

关键词: Ocoí River;    Itaipu Reservoir;    phosphorus and nitrogen;    principal component analysis;    trophic index;   

DOI  :  10.1590/S0103-50532009000900004

来源: SciELO

【 摘 要 】

Starting from spatial-temporal distribution of nitrogen and phosphorus species in Ocoí river Sub-basin, Itaipu's tributary, this work evaluated the environmental impact in surface waters. After rain, non-point sources are predominant, presenting higher levels of total phosphorus and nitrogen. In the case of phosphorus, trophic states varied from ultraoligotrophic to mesotrophic. Even though Brazilian legislation is obeyed for surface and drinking water, total nitrogen showed values above background levels, and nitrite concentration, 0.06 mg L-1 NO2--N, lies above the recommended value meant to protect aquatic life, according to the Canadian Water Quality Guidelines. Non-point and point sources control is advisable to minimize environmental phosphorus and nitrogen species impact, increasing the water support capacity and minimizing its discharge into Itaipu Reservoir.

【 授权许可】

CC BY   
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