Análise qualitativa de poluentes na água das chuvas em Lavras - MG

The objective of this study was to evaluate the dynamics of rainfall pollutants and nutrient input from rainfall in Lavras-MG in 2010-2011. Forty-one samples of rainfall were collected at two different points: downtown and at the Federal University of Lavras. Results of sampling showed average value...

Full description

Bibliographic Details
Main Authors: Fia, Ronaldo, Frizzarim, Sthefanny Sanchez, Fia, Fátima Resende Luiz
Format: Article in Journal/Newspaper
Language:Portuguese
Published: Brazilian Association of Water Resources 2013
Subjects:
Online Access:http://repositorio.ufla.br/jspui/handle/1/29196
https://abrh.s3-sa-east-1.amazonaws.com/Sumarios/98/6b4441aec74122617cdc09cb09d3ed23_7b301107d6ad489b4a160c4e3cc2c310.pdf
Description
Summary:The objective of this study was to evaluate the dynamics of rainfall pollutants and nutrient input from rainfall in Lavras-MG in 2010-2011. Forty-one samples of rainfall were collected at two different points: downtown and at the Federal University of Lavras. Results of sampling showed average values, weighted by volume, of pH, alkalinity, carbonic acid, nitrate, ammonium and sulfate, respectively for samples collected downtown and at the Federal University of Lavras, equal to 6.5 and 6.9, 37.3 and 76.2 eq L-1, 173.0 and 133.6 eq L-1, 3.8 and 4.6 eq L-1, 21.2 and 16.7 eq L-1, 42.8 and 43.0 eq L1 . During this period there was an average contribution of 3.67 kg ha-1 NO3 - , 4.82 kg ha-1 NH4 + and 58.19 kg ha-1 SO4 2-. The highest concentrations of ammonium, sulphate and carbonic acid were found downtown, probably due to the greater contribution of pollution generated by automobiles. This contributes to the lower pH values observed downtown. However, the rainfall events in the region showed no immediate risk of environmental acidification. O objetivo deste trabalho foi avaliar a dinâmica de poluentes na água das chuvas, e o aporte de nutrientes proveniente da chuva em Lavras-MG durante o ano hidrológico 2010/2011. Quarenta e uma amostras de água de chuva foram coletadas entre os meses de setembro de 2010 e agosto de 2011. Foram instalados dois coletores (funil de polietileno com 0,20 m de diâmetro, fixado a 3 m do solo e acoplado a um recipiente de polietileno com capacidade de 10 L) em dois diferentes pontos: no centro da cidade e na Universidade Federal de Lavras. Resultados da amostragem apresentaram valores médios, ponderados pelo volume, de pH, alcalinidade, ácido carbônico, nitrato, amônio e sulfato, respectivamente, para amostras coletadas no centro e na Universidade Federal de Lavras, iguais a 6,5 e 6,9, 37,3 e 76,2 eq L-1, 173,0 e 133,6 eq L-1, 3,8 e 4,6 eq L-1, 21,2 e 16,7 eq L-1, 42,8 e 43,0 eq L-1. Nesse período houve um aporte médio de 3,67 kg ha-1 de NO3 - , 4,82 kg ha-1 de NH4 + e 58,19 ...