Journal of Food, Agriculture and Environment

Dissipation and bound residue formation of alachlor due to the swine wastewater application in soil 

Author(s):

Tatiane C. Dal Bosco*, Silvio C. Sampaio, Silvia R. M. Coelho, Natássia J. Cosmann, Simone D. Gomes, Morgana S. Gonçalves, Tábata Z. Bischoff, Liziane Z. de Souza

Recieved Date: 2012-07-08, Accepted Date: 2012-09-30

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. Actually the dissolved organic matter has been investigated due to its capacity to improve the pesticide leaching or bound residues formation. This study aimed at evaluating the effects of total and dissolved organic matter application from two systems of swine wastewater, biodigester and lagoon treatments, in alachlor formation of bound residues into soil. The soil used to the extraction of bound residues was from a miscible displacement test of alachlor, where soil was treated with total and dissolved organic matter in disturbed soil columns. Extraction and quantification of desorption, extractable and bound residues were carried out. The chemical fractions of humic substances in extracts containing organic matter of low molecular weight humic and fulvic acids were characterized by infrared spectroscopy and total organic carbon concentration. The dissolved organic matter did not show desorption residues, only extractable ones. The highest amount of total organic carbon was in organic matter of low molecular weight, spectroscope characterized, by the presence of carboxylate anions, which are important in sorption process. From a soil contamination perspective, biodigester swine wastewater in dissolved form would be the treatment that would less contribute to this process. From a toxicological perspective, and would result in less damage to soil biota, since it showed greater bound residue formation and dissipation of alachlor. 

Keywords:

Fractionation of humic substances, infrared spectroscopy, bound residues, desorption residues, extractable residues, pesticides, dissolved organic matter, total organic matter, soil pollution, biodigester, lagoon treatments

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1327-1334

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