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Através da distribuição espacial-temporal das espécies do nitrogênio e do fósforo total na Sub-bacia do Rio Ocoí, tributário do Reservatório de Itaipu, este trabalho avaliou o impacto ambiental nas águas superficiais. Após as chuvas, as fontes difusas predominam, onde o fósforo total e nitrogênio são mais altos. Para o fósforo, os estados tróficos variaram de ultraoligotrófico a mesotrófico. As concentrações atendem à legislação nacional, tanto para águas superficiais quanto potável. Todavia, o nitrogênio total apresenta-se acima dos valores basais, e o nitrito, 0.06 mg L -1 NO2 - -N, ficou acima do recomendado para proteção da vida aquática, segundo a Canadian Water Quality Guidelines. O controle das fontes difusas e pontuais é recomendado para minimizar o impacto dos poluentes, ampliando a capacidade de suporte das águas, reduzindo o seu aporte para o Reservatório de Itaipu. 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.

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