NITROGEN AND PHOSPHORUS DYNAMIC IN THE DISSOLVED AND PARTICULATE FRACTIONS IN RIVER WATER FROM RAINFALL EPISODE
Keywords:
Filtration, Centrifugation, Diffuse Pollution, Water qualityAbstract
Rainfall episodes increase river flow and, consequently, carry into the river pollution through diffuse routes due to the transport of particulate through runoff. The behavior of elements as nitrogen (N) and phosphorus (P) are found in the aquatic system defines the type of interactions that can occur with or from them in a water body. Therefore, the objective of this work was to quantify N and P in the dissolved and particulate forms, in samples of a rain event, in order to verify in which fraction they are predominant. The separation methods by filtration and centrifugation were tested. The study area was the Barigui River, at two monitoring points in the northern portion of the watershed. The results indicated that P is predominant in the particulate fraction, and that N is predominant in the dissolved fraction, due to the interaction forces and solubility of these elements. In addition, the filtration method proved to be more efficient in separating the fractions than the centrifugation method. In this way, the understanding of this dynamic corroborates with what is determined by legislation, however measures for controlling pollution through diffuse ways and their impacts on water quality must be refined to improve water resources management
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