Thiram and picloram as entrapping agents for lead depicted by electrochemical methods
Keywords: 
Thiram
Picloram
Pesticides
Lead
Complexation
Issue Date: 
1-May-2010
Publisher: 
Sociedade Brasileira de Química
ISSN: 
0103-5053
Citation: 
Valle EMA, Santamaría C, Machado SAS, Fernández JM. Thiram and picloram as entrapping agents for lead depicted by electrochemical methods. J Braz Chem Soc 2010;21(6):1052-1059
Abstract
The affinity of two widely used pesticides of diverse specificities, i.e., the fungicide Thiram and the herbicide Picloram, for lead ions has been studied by an electrochemical approach. The anodic stripping voltammetric profile of the studied metallic ion was significantly affected by the chemical nature of pesticide (ligand) used and new light has been shed on the nature, strength and possible stoichiometry of formed complexes. Thiram caused a pronounced effect on the stripping signals of Pb. Linearization algorithms of titration data with the metal allowed the conditional stability constant to be calculated for Thiram (log K' = 6.8) and Picloram (log K' = 6.0). It was found that both pesticides contribute to the formation of the respective 1:1 complexes with Pb in a high percentage (ca. 83%).

Files in This Item:
File: 
2010-05-JBCS.pdf
Description: 
Size: 
88,71 kB
Format: 
Adobe PDF


Items in Dadun are protected by copyright, with all rights reserved, unless otherwise indicated.