Abstract
Starting from spatial-temporal distribution of nitrogen and phosphorus species in Ocoi 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.
Highlights
Nitrogen and phosphorus species in aquatic systems are known pollutants,[1,2] but not less important since they are strongly linked with the lifestyle of our society
The environmental water quality of the Ocoí River has its importance increased by the fact that the Ocoí River is tributary of the Itaipu Reservoir
If the limited value of total nitrogen (TN) proposed by Dodds et al.,[36] are adopted for streams in temperate environment, i.e. 0.7 mg L-1 N for oligotrophic water bodies, and 1.5 mg L-1 N for eutrophic/mesotrophic limit, the results showed in Table 4 indicate that the water can be classified as eutrophic for P.1, P.2, P.4 and P.5 points
Summary
Nitrogen and phosphorus species in aquatic systems are known pollutants,[1,2] but not less important since they are strongly linked with the lifestyle of our society. The 2nd Campaign was carried out after one dry month and possibly was better to represent the Ocoí River Sub-basin behavior without non-point sources in dry period, without runoff.
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