Modeling the binding of triazine herbicides to humic substances using capillary electrophoresis

Abstract

The binding of four s-triazines herbicides and metabolites, ameline, hydroxyatrazine, atraton and ametryn to 12 structurally different humic substances was studied by affinity capillary electrophoresis (ACE). Binding data were confronted to the structural data of humic acids obtained from spectrometric measurements (UV-Vis, FTIR, NMR), elemental analysis and potentiometric titration. The results obtained with principal component analysis and partial least-square analysis clearly show the importance of carboxylic acidity and aromaticity of the humic ligands in relation to the partial positive charge and relative hydrophobicity of the pesticides.

Atrazine and Terbutryn Degradation in Deposits from Groundwater Environment within the Boreal Region in Lahti, Finland

“…The organic matter occurred in deposits with nitrogen ( r = 0.951, p < 0.05) and lead ( r = 0.959, p < 0.01). The interactions among atrazine, organic matter, nitrogen, and lead could decrease atrazine availability for the chemical and microbial degradation , − , especially in the deposit from pipe B with the highest amount of these compounds and half-lives of 754−1081 d. The highest organic matter and nitrogen contents of pipe B deposit likely resulted from the bank filtration of water from Lake Vesijärvi to the groundwater ( Figure ). When released from the organic matter, nitrogen could prevent biotic atrazine degradation as a nitrogen source , , and lead could be toxic to microbes , .…”

Singular Structural Features on Humic Fractions in Solution: Statistical Analysis of Diverse Analytical Techniques Spectra

“…Previous studies have shown the usefulness of statistical methods for the quantitative or semiquantitative analysis of very complex data sets, such as those derived from mass spectroscopy (Beauchemin et al, 2002;Boehme et al, 2004;Celano et al, 2008;Lucio and Schmitt-Kopplin, 2006;Moreda-Piñeiro et al, 2006;Peña-Méndez et al, 2005;White et al, 2007;Šmejkalová and Piccolo, 2008). Among these statistical methods, the use of a specifi c method of principal components analysis (PCA), Pareto analysis, has proven to be very promising (Baigorri et al, 2008).…”

“…Among these statistical methods, the use of a specifi c method of principal components analysis (PCA), Pareto analysis, has proven to be very promising (Baigorri et al, 2008). Principal components analysis reduces the data set but thereby loses some information (Baigorri et al, 2008;Beauchemin et al, 2002;Boehme et al, 2004;Celano et al, 2008;Lucio and Schmitt-Kopplin, 2006;Moreda-Piñeiro et al, 2006;Peña-Méndez et al, 2005;White et al, 2007;Šmejkalová and Piccolo, 2008). Pareto analysis is a statistical technique used in decision making that selects those facts that produce a signifi cant overall eff ect.…”

EPR, FTIR, Raman, UV–Visible Absorption, and Fluorescence Spectroscopies in Studies of NOM

“…UV -vis absorption results confi rm the hypothesis that HS acted as H + donor favoring the reduction of PNP. Lucio and Schmitt -Kopplin (2006) modeled the binding of triazine herbicides to HS using capillary electrophoresis, spectroscopic measurements (UV -vis, FTIR, NMR), elemental analysis, and potentiometric titration. Martin -Neto et al (2001) observed by UV -vis spectra and polarography that the interactions of HS with the herbicide atrazine are strongly pH -dependent (Figure 16.28 ).…”