poster - International Conference of Agricultural Engineering

DESORPTIONS, EXTRACTABLES AND BOUND RESIDUES OF
ALACHLOR IN SOIL WITH THE ADDITION OF ORGANIC MATTER
FROM SWINE WASTEWATER
Tatiane C. Dal Bosco 1* , Silvio C. Sampaio 2 , Silvia R.M. Coelho 2 , Natássia J.
Cosmann 2 , Marcos H. Kunita 3 , Morgana S.Gonçalves 4
1 Universidade Tecnológica Federal do Paraná (Technological University of Paraná),
Câmpus Londrina, Avenida dos Pioneiros, 3131, Londrina-PR, 86036-370, Brazil.
2 Universidade Estadual do Oeste do Paraná (State University of West Paraná), Câmpus
Cascavel, Rua Universitária, 2069, Cascavel –PR, 86819-110, Brazil.
3 Universidade Estadual de Maringá (State University of Maringá), Avenida Colombo, 5970,
Maringá –PR, 87020-900, Brazil.
4 Universidade Tecnológica Federal do Paraná (Technological University of Paraná),
Câmpus Francisco Beltrão, Linha Santa Bárbara, sem número, Francisco Beltrão-PR,
85601-970, Brazil.
Corresponding author. E-mail: tatianebosco@utfpr.edu.br
Abstract
Swine wastewater application into soil to reuse water on cropping provides the addition of
total and dissolved organic matter to soil, which interferes in the dynamics of pesticides in
soil. This study aims at evaluating the effects of total and dissolved organic matter
application from two systems of swine wastewater, biodigestor and lagoon treatments, in
alachlor formation of bound residues into soil. Extraction and quantification of desorption,
extractable and bound residues were carried out after the evaluation of miscible
displacement of alachlor performed by disturbed soil columns. The dissolved organic matter
did not show desorption residues, only extractable ones. From a soil contamination
perspective, biodigester swine wastewater in dissolved form would be the treatment that
would less contribute to this process. Whereas from a toxicological perspective, biodigester
swine wastewater in dissolved form would result in less damage to soil biota, since it showed
greater bound residue formation and dissipation of alachlor.
Keywords: biodigestor wastewater, lagoon treatment wastewater, pesticides.
1. Introduction
In soil, pesticides may be sorbed to soil particles, degraded into other chemical forms
by physical and / or microbiological chemical processes, leached downward to groundwater
or transferred from surface water to groundwater, causing impacts on public health (Cheng et
al., 2010; Bouchonnet et al., 2011). These processes occur simultaneously and are subject
to complex interactions. Considering that the majority of pesticides is found in middle-depth
soil, pesticide residues are the main source of contamination of groundwater and of
agricultural crops (Majumdar & Singh, 2007).
According to Andréa (1992), during the dissipation process, pesticides can react with
soil organic matter and in several manners, many of such reactions lead to the formation of
residues. These residues may be from the pesticide itself and / or from metabolites which
may be removable or, alternatively, residues that are not extractable, also called bound
residues. Muller et al. (2007) reported that irrigation with effluents can promote remobilization
of bound residues in the degradation of organic matter mediated by microorganisms.
Moreover, the introduction of organic and inorganic chemical compounds from irrigation with
effluents can increase the amount of dissolved organic matter, favoring the formation of
bound residues. According Lerch et al. (2009), the first consequence of the formation of nonextractable
bound residues is associated to decreased availability of pesticide residues with
the consequent increase in persistence in soil. The possibility of reversal among the forms of