Análise da concentração de alumínio na água e sedimentos em um trecho do Rio do Campo – Campo Mourão/PR

Abstract

The growth of industrialization, agriculture and urban poles, drives pollution of the environment, and water bodies, due to lack of planning, are the most affected, since they receive a high load of contaminants from anthropic activities, among them heavy metals. The objective of this work was to analyze the concentration of aluminum present in water and sediment samples in a section of the Campo river, located in Campo Mourão city - Paraná. In order to do so, five monthly water and sediment samples were collected at three different points of the river, and flow measurement and soil sampling were also performed. The collected water and sediment samples were sent to the laboratory and the total aluminum concentration in them was determined from acid digestion and analysis by atomic absorption spectrophotometry. The results of aluminum concentrations in all analyzed water samples presented values above the water quality standard for Class 2 rivers (0.1 mg L-1), according to CONAMA Resolution No. 357/2005. The amount of aluminum found in the sediment samples ranged from 54.8 to 138.52 mg kg-1 among the 3 collection points during the campaigns. The changes in aluminum content in the samples may be associated with the presence of aluminum in the soil of the region (1103.8 mg kg-1) and the anthropic activities in the vicinity of collection points such as agriculture without adequate soil conservation practices, suppression of ciliary vegetation, civil construction, residential subdivision, residential neighborhoods, industrial effluent disposal, among others, which makes it possible to drag soil and pollutants to the river.