Sulcotrione versus atrazine transport and degradation in soil columns

Abstract

A soil column experiment under outdoor conditions was performed to monitor the fate of 14C-ring-labelled sulcotrione, 2-(2-chloro-4-mesylbenzoyl)cyclohexane-1,3-dione and atrazine, 6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine, in water leachates and in the ploughed horizon of a sandy loam soil. Two months after treatment, the cumulative amounts of herbicide residues leached from the soil were 14.5% and 7% of the applied radioactivity for sulcotrione and atrazine, respectively. Maximum leachate concentrations for each herbicide were observed during the first month following application: 120 and 95 microg litre(-1) for sulcotrione and atrazine respectively. After 2 weeks, 78% of the sulcotrione and atrazine was extractable from the soil, whereas after two months only 10 and 4%, respectively, could be extracted. The maximum sulcotrione content in the first 10 cm of soil was identical with that of atrazine. For both molecules, the content of non-extractable residues was low, being around 15%. Sulcotrione seems to be more mobile than atrazine but the consequences for water contamination are similar since lower doses are used.

Modification of clay barriers with a cationic surfactant to improve the retention of pesticides in soils

“…Immediately after this, 1 mL of a solution of linuron, atrazine or metalaxyl at 1000 g/mL in methanol was added to the top part of those columns saturated with water. Methanol was rapidly evaporated and so the three pesticides were incorporated to the soil in similar conditions [28,29]. Each experiment was carried out in triplicate.…”

Effect of Adjuvants and pH Adjuster on the Efficacy of Sulcotrione Herbicide

“…It is absorbed by the leaves and roots of plants. The solubility of this substance at 25 • C is 165 mg/l [13]. It is a weak acid; its pKa value is 2.87 [14].…”

Degradation study of mesotrione and other triketone herbicides on soils and sediments

“…The transformation of triketone in soils is also an object of investigation (Chaabane et al 2005(Chaabane et al , 2008Cherrier et al 2005; Murati et al 2012); however, the studies have been conducted on individual compounds and/or under different experimental conditions, which hinders the comparison of the results and thereby the assessment of triketones and their degradation products stability in soils and sediments. The aim of this study was to investigate stability of both triketone herbicides and their degradation products in soils and sediments with different physicochemical properties.…”