GIULIETTI Ana Maria
Spiking solvent, humity and their impact on 2,4-D and 2,4-DBP extractability from high humic matter content soils
MERINI, L.J.; CUADRADO V.; GIULIETTI A.M.
Año: 2008 p. 2168 - 2168
Abstract 10 The 2,4-dichlorophenoxyacetic acid (2,4-D) is a hormone-like herbicide widely used in agriculture. Although its half life in soil is 11 approximately two weeks, the thousands of tons introduced in the environment every year represent a risk for human health and the 12 environment. Considering the toxic properties of this compound and its degradation products, it is important to assess and monitor 13 the 2,4-D residues in agricultural soils. Furthermore, experiments of phyto/bioremediation are carried out to find economic and envi- 14 ronmental friendly tools to restore the polluted soils. Accordingly, it is essential to accurately measure the amount of 2,4-D and its 15 metabolites in soils. There is evidence that 2,4-D extraction from soil samples seriously depends on the physical and chemical properties 16 of the soil, especially in those soils with high content of humic acids. The aim of this work was to assess the variables that influence the 17 recovery and subsequent analysis of 2,4-D and its main metabolite (2,4-dichlorophenol) from those soils samples. The results showed 18 that the recovery efficiency depends on the solvent and method used for the extraction, the amount and kind of solvent used for dissolv- 19 ing the herbicide and the soil water content at the moment of spiking. An optimized protocol for the extraction and quantification of 2,4- 20 D and its main metabolite from soil samples is presented. 21 _ 2008 Published by Elsevier Ltd. 22 Keywords: Phenoxy herbicides; Humic acid; Fulvic acid; Soil extraction; Humines