TITLE:
Hydrogeochemical Research of Surface Water of the Córrego Sujo Watershed, Teresópolis, RJ, Brazil
AUTHORS:
Paula Coelho Araujo, André S. Avelar, Vítor dos Santos Costa, Maria Isabel Martinez
KEYWORDS:
Hydrogeochemistry, Natural and Anthropogenic Influences, Land Use, Surface Waters Rivers
JOURNAL NAME:
Agricultural Sciences,
Vol.8 No.5,
May
27,
2017
ABSTRACT: The
surface water quality was investigated in the Córrego Sujo watershed, located
in the municipality of Teresópolis, a mountainous region in the state of Rio de
Janeiro, Brazil. The emphasis focused on inorganic parameters of water, since
there are applications of pesticides in agricultural cultivations. The natural
and anthropogenic contributions of the study area were monitored monthly in
eight sites in the river channels of the drainage basin. The results were
analyzed using an ICP-OES spectrophotometer and subsequently compared to Conama
Resolution 357/05. In order to support the interpretation of the results of
water quality, flow and precipitation data were measured in the watershed,
along with the land use and vegetation cover map produced from a GeoEye
satellite image. The study revealed that the surface waters were in high
concentrations and above those recommended by Conama Resolution. It was noted
also that the lithological and pedological variables influenced the results of
water quality. Regarding seasonality, it has not been possible to establish a
common standard to all elements in the rainy season or dry season, however, in
the analysis of each parameter separately, there was evidence of a
concentration distribution in temporal variation. Therefore, the results of
this study indicate that it is also necessary to highlight these issues in the
territorial planning of the municipality and in the management of the Committee
of Rio Piabanha watershed, to avoid the increasing of uncontrolled expansion of
irrigated crops and intensive use of agrochemical inputs.