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Role of Soil Physicochemical Properties in Quantifying the Fate of Diuron, Hexazinone, and Metribuzin

Role of Soil Physicochemical Properties in Quantifying the Fate of Diuron, Hexazinone, and Metribuzin

Ana Carolina Dias Guimarães, Kassio Ferreira Mendes, Fabrícia Cristina Dos Reis, Thais Fornasiero Campion, Pedro Jacob Christoffoleti, Valdemar Luiz Tornisielo

Environ Sci Pollut Res Int. 2018 May;25(13):12419-12433.

PMID: 29460247

Abstract:

The physicochemical properties of soil are fundamental to quantification of the fate of herbicides. Thus, the aim of this research was to evaluate the fate of diuron, hexazinone, and metribuzin in five soils (Clay-1, Clay-2, Loam-1, Loam-2, and Sand), presenting variation in clay content, cation exchange capacity (CEC), pH, and organic carbon (OC). Herbicides radiolabeled with 14C were applied, and the 14C-CO2 released from mineralization was trapped in 0.2 mol L-1 sodium hydroxide solution. The degradation ratio, as well as herbicide-bound residues (non-extractable), transformation products, and residues extractable from soil, was also evaluated. Average 14C-CO2 evolution accumulated for diuron mineralization was higher (22.24%) than hexazinone (7.73%) and metribuzin (3.20%). The degradation time half-life (DT50) values for hexazinone correlated with soil OC content. Although no correlation between soil properties and DT50 values was found for metribuzin, the degradation rate and total degree of mineralization were low in sand soil for metribuzin. Regarding diuron, OC content and CEC value appear to be related to mineralization and degradation rate, respectively. Differences in soil properties can influence the persistence and fate of herbicides, affecting their impact on the environment, weed control, and possible effects on subsequent crops.

Chemicals Related in the Paper:

Catalog Number	Product Name	Price
AS2121201	Herbicides - Loam 2	Price
AS2121202	Pesticides - Loam 1	Price
AS2121207	Pesticides - Clay Loam 1	Price

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