Abstract
This paper presents the results of the concentration of macronutrient phosphorus in the form of phosphate ion. These results were obtained spectrophotometrically by the molybdenum blue method using river water samples from four locations in the coastal cities of Paraná state. The tests showed that the concentration of this particular ion was much higher than the amount recommended in Resolution 357 of the National Environmental Council (CONAMA). These findings were discussed and compared to the results of previous research, aiming to demonstrate the implications these high concentrations have on the environment of Parana’s coastline. Finally, the study assessed the possible causes for the significant increase in the concentration of this ion close to the Port of Paranaguá and Antonina.
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