Avaliação hidroquímica e geofísica do aquífero Alter do Chão de áreas de lava jatos de Santarém, Pará
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2023-01-27Autor
http://lattes.cnpq.br/4211299475843331
FREITAS, Andressa Maria Sousa
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This
study aimed to analyze the water quality in nine car wash wells that collect water from the
Alter do Chão aquifer, in the urban area of Santarém PA. The purpose of this analysis is to
verify the influence of wastewater from washing vehicles on the aquifer water through physical
ch emical analyzes of the water from these wells in conjunction with the GPR analysis of the
preferential area of flow and infiltration of the washing water. The geophysical method used
via GPR was the electromagnetic one, which allows observing the regions o f interest in the
subsurface. For the groundwater physical chemical technique, the water sample was collected
in triplicate during the rainy season of 2019, following the CETESB methodology.
Temperature, tolerated oxygen, electrical conductivity, pH and to tal solids measurements were
measured in situ, using a portable multiparameter probe AKSO AK88, while physical chemical
analyzes of alkalinity and total hardness, ions, and heavy metals and arsenic were carried out
in the laboratories of Environmental Biol ogy/Ufopa, Multianalysis/Belém PA,
Hydrochemistry/Ufpa and Geochemistry and Water/Unb DF, respectively. The results obtained
by the GPR show that seven of the nine wells studied had, from a depth of 1.5 m, attenuated
zones detected by low reflection method s, possibly related to infection caused by residual fluids
from the washing processes. Groundwater was classified as sodium chlorinated, acidic (average
pH of 3.73 0.30), with average temperatures of 30.01°C, soft and a little hard (average
hardness of 4 8.00 mg/L 12.47 CaCO3), mineralized (average EC of 252.50 μS/cm 49.33
μS/cm), little oxygenated (average OD of 3.37 mg/L 10.56), clear and transparent (average
STD of 112, 42 mg/L 27.47) within the recommended range for drinking water. The ionic
co mposition of Mg2+, Ca2+, Na+, K+, and SO42 was within the range allowed by the national
resolution for drinking water, as well as the concentrations of metals Cr, Pb, As, Cu and Zn. On
the other hand, all wells had water with a relatively high concentrati on of NO3 and Al, with
values above the limit established by Ordinance of the Ministry of Health No. 888/2021. It is
concluded that the water from the studied wells poses risks to human health, both because of
its ionic and metallic composition, and becau se of the presence of underground contamination
plumes.