Herbicide detection in groundwater in Córrego Rico-SP watershed

Abstract

-Due to the large amount of pesticides applied in agriculture, mainly herbicides, there is a growing concern about a possible environmental contamination with these products, including water bodies. Given the above, the aim of the present work was to detect and quantify herbicides through multiresidue analysis in water samples collected in semiartesian wells and springs in a rural area of the city of Jaboticabal (SP). Samples were collected from 32 wells and 13 water springs, in three different seasons: October 2010, February 2011 and May 2011. Additionally, samples at a residence in the urban area were also collected. Analysis using high performance liquid chromatography coupled to mass spectrometry was performed and herbicides ametryn, amicarbazone, clomazone, diclosulan, diuron, hexazinone, imazapic, imazapyr, isoxaflutole, S-metolachlor, sulfentrazone, sulfometuron-methyl, and tebuthiuron were evaluated. In semi-artesian wells, an incresed quantity of herbicides was found in comparison with the water springs. Among the tested herbicides, hexazinone, imazapyr and sulfentrazone were detected in measurable amounts in accordance with the analytical method applied, while clomazone was the most common herbicide being detected in more than 60% of the samples. Ametryn, diuron and amicarbazone herbicides were also detected. Diclosulan, imazapic, isoxaflutole, S-metolachlor, sulfometuron-methyl, and tebuthiuron were not detected in any sample. Inappropriate use of these products without prior knowledge of the behavior of the soil can lead to groundwaters and water springs contamination, thus an ongoing monitoring of this resource becomes very important.Keywords: sugarcane, LC-MS/MS, water springs, semi-artesian wells. ametryn, amicarbazone, clomazone, diclosulan, diuron, hexazinone, imazapic, imazapyr, isoxaflutole, S-metolachlor, sulfentrazone, sulfometuron-methyl SANTOS, E.A. et al. RESUMO -Em vista da grande quantidade de agroquímicos aplicados na agricultura, principalmente os herbicidas, cresce a preocupação com a possível contaminação do ambiente com esses produtos, inclusive em corpos d'água. Diante do exposto, o objetivo deste trabalho foi detectar e quantificar herbicidas, por meio de análise multirresíduo, em amostras de água coletadas em poços semiartesianos e nascentes, em uma área rural da cidade de Jaboticabal (SP). Foram coletadas amostras em 32 poços e 13 nascentes, em três épocas: outubro de 2010, fevereiro e maio de 2011. Foram coletadas, adicionalmente, amostras em uma residência na área urbana. Foi realizada análise por cromatografia líquida de alta eficiência acoplada à espectrometria de massas e foram avaliados os herbicidas

Tolerance to the herbicide clomazone and potential for changes of forest species

“…Herbicides such as hexazinone, imazapyr and sulfentrazone, clomazone, ametryn, amicarbazone and diuron were detected in semiartesian wells and springs region of the Córrego Rico-SP microbasin. Among these, clomazone was the most frequent herbicide, being detected in more than 60% of the samples (SANTOS et al, 2015). Similar evaluations were carried out in rivers and agricultural waters of the central region of Rio Grande do Sul, finding in 90% of samples collected residues of clomazone (NALINI et al, 2016).…”

Residual de metribuzin no solo sobre o crescimento do alho, cebola e feijão

“…Visual intoxication evaluations of the crops were carried out at 7, 14, 21 and 28 DAE. A scale from 0 to 100% was used, in which zero corresponds to no impact and 100 signifies plant death (SBCPD, 1995). At 28 DAE, the aerial part of the plant was collected and placed in paper bags for drying in forced ventilation stove at 72 ºC, until constant mass was achieved, before being weighed to determine the dry matter.…”

“…Some of these herbicides have a residual effect on the soil, that is, they remain active in the soil enabling weed control for a longer time period (Melo et al, 2010). However, the residue from herbicides in the soil can increase the risk of contamination in surface and underground water (Marchesan et al, 2010;Otto et al, 2012;Santos et al, 2015), besides causing intoxication of the crops cultivated in succession (Artuzi e Contiero, 2006;Dan et al, 2010;Mancuso et al, 2011).…”

Carryover de herbicidas em sistemas cultivados com olerícolas

“…However, the residue of herbicides in the soil can lead to contamination of surface and groundwater (Marchesan et al, 2010;Otto et al, 2012;Santos et al, 2015), besides causing intoxication and harm the growth and development of crops in succession (Artuzi and Contiero, 2006;Dan et al, 2010;Mancuso et al, 2011). This toxicity may or may not be visible and result in reduction of growth, the quality and productivity of the culture, even in the presence of low concentrations of herbicide in the soil (Robinson, 2008).…”