Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Alister, Claudio; Kogan, Marcelo J.

doi:10.1590/s0100-83582010000500014

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…[46-48] These two factors can also impact the long term effects of biochar soil amendment and interact in the ageing of biochar. Sorption capacity of aged biochar has been observed in some cases to decrease with time [43] and, in other cases, remain similar to the behavior of freshly added biochar.…”

Section: Resultsmentioning

confidence: 99%

Phenylurea herbicide sorption to biochars and agricultural soil

Wang

Mukome

Yan

et al. 2015

Journal of Environmental Science and Health, Part B

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Biochar is increasingly been used as a soil amendment to improve water holding capacity, reduce nutrient leaching, increase soil pH and also as a means to reduce contamination through sorption of heavy metals or organic pollutants. The sorption behavior of three phenylurea herbicides (monuron, diuron, linuron) on five biochars (Enhanced Biochar, Hog Waste, Turkey Litter, Walnut Shell and Wood Feedstock) and an agricultural soil (Yolo silt loam) was investigated using a batch equilibration method. Sorption isotherms of herbicides to biochars were well described by the Freundlich model (R2 = 0.93 -- 0.97). The adsorption KF values ranged from 6.94 to 1306.95 mg kg−1 and indicated the sorption of herbicides in the biochars and Yolo soil was in the sequence of linuron > diuron > monuron and walnut shell biochar > wood feedstock biochar > turkey litter biochar > enhanced biochar > hog waste biochar > Yolo soil. These data show that sorption of herbicides to biochar can have both positive (reduced off-site transport) and negative (reduced herbicide efficacy) implications and specific biochar properties, such as H/C ratio and surface area, should be considered together with soil type, agriculture chemical and climate condition in biochar application to agricultural soil to optimize the system for both agricultural and environmental benefits.

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Section: Resultsmentioning

confidence: 99%

Phenylurea herbicide sorption to biochars and agricultural soil

Wang

Mukome

Yan

et al. 2015

Journal of Environmental Science and Health, Part B

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“…A relação positiva entre teores de carbono orgâ-nico e sorção desse herbicida é relatada por vários autores (Inoue et al, 2006;Alister et al, 2010;Liu et al, 2010). Na fração orgânica do solo há diferenças na capacidade de sorção entre seus constituintes.…”

Section: Sorção E Dessorção Do Diuron Em Quatro Latossolos Brasileirosunclassified

Sorção e dessorção do diuron em quatro latossolos brasileiros

Rocha¹,

Faria²,

Borges³

et al. 2013

Planta daninha

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231Sorção e dessorção do diuron em quatro latossolos brasileiros 1 Recebido para publicação em 2.5.2012 e aprovado em 25.10.2012. Palavras-chave: herbicidas não iônicos, isotermas de Freundlich, pH do solo.ABSTRACT -The knowledge of herbicide sorption in soils is one of the conditions needed to make reliable recommendations of these compounds, based on their technical and environmental aspects. Thus, the aim of this work was to evaluate sorption and desorption of diuron in Red-Yellow Latosol (RYL), Humic Red-Yellow Latosol (HRYL), Red Latosol (RL), and Yellow Latosol (YL), with different pH values. The Batch Equilibrium method was used to evaluate sorption and desorption. It consisted of the use of 10.0 mL of solution at concentrations of 0.5, 1, 2, 4, 8, and 15 mg L -1 of diuron, prepared in CaCl 2 0.01 mol L -1 . These solutions were added in 2.00 g of soil sample, remaining under agitation for 12 h. After centrifugation and filtration, the diuron concentration in the supernatant was determined by high performance liquid chromatography. Desorption was evaluated using samples kept in tubes after the sorption tests, at an initial concentration of 8 mg L -1 of the herbicide. The Freundlich isotherm was adjusted appropriately to describe the sorption of diuron for all soils. The sorption of diuron was directly related to organic matter content, whereas soils with higher organic matter content, RYL and HRYL showed higher sorption coefficients. The pH increase in soil increases diuron sorption. This was more evident in RL, which has the lowest organic matter content. The desorption process was the inverse of the diuron sorption process, since soils with lower sorption had the highest percentages of desorption.

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“…6). Although we cannot rule out unlawful use of diuron on vineyard plots at the downstream section of the Morcille watershed, one could assume that chronic contamination of the Morcille by diuron several months after its ban can mainly be due to its release from contaminated soils through leaching, run-off or soil erosion (Reichenberger et al, 2007 andAlister andKogan, 2010). The difference in contamination level between the intermediate and downstream stations might thus be related to a difference in the proportions of vineyard land areas between intermediate and downstream locations (52% and 72% of the catchment area respectively; Pesce et al, 2010a).…”

Section: Did the Ban Of Diuron Lead To A Decrease In The Exposure Levmentioning

confidence: 99%

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

Pesce¹,

Margoum²,

Rouard³

et al. 2013

Ecological Indicators

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The aim of this study was to evaluate the use of freshwater sediment biodegradation potential as an ecological indicator for monitoring microbial recovery following a decrease in chronic pesticide exposure. For this purpose, a four-year case study (2008)(2009)(2010)(2011) was conducted in a small stream (Morcille river) long exposed to high diuron concentrations, increasing from upstream to downstream. Our results show that the ban on diuron in December 2008 resulted in a progressive decrease in its concentrations in the Morcille river over the survey period. However, diuron remained present in the water three years after the ban. The spatio-temporal variations in the sediment biodegradation potential were assessed by radiorespirometry using [ring-U-14C] diuron to estimate diuron mineralization potentials. Between autumn 2008 and autumn 2011, mean diuron mineralization percentage after 15 weeks of incubation decreased by 65% downstream and by 82% in the intermediate sector, and mean 10% diuron dissipation time values increased between 143% (downstream) and 210% (intermediate). Thus the decrease in the level of chronic diuron exposure in the river also caused a fall in sediment diuron-mineralizing capacities, revealing a corresponding recovery of microbial communities. Our results show that the use of freshwater sediment biodegradation potential may be useful for assessing microbial recovery after a decrease in chronic exposure to pollutants, opening prospects for developing a new class of ecological indicator to monitor the recovery of biological quality of water resources. In this way, the use of molecular approaches based on direct extraction of nucleic acids from environmental matrices and their subsequent analysis by PCR-based approaches to quantify the abundance of pesticide-degrading communities could represent a promising alternative. Highlights► We performed a 4-year survey in a river long exposed to diuron. ► The ban on diuron resulted in a gradual fall in its concentrations in the river. ► Sediment diuron biodegradation potential decreased throughout the survey. ► Degradation capacities can be an ecological indicator to gauge microbial recovery.

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Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Cited by 12 publications

References 48 publications

Phenylurea herbicide sorption to biochars and agricultural soil

Phenylurea herbicide sorption to biochars and agricultural soil

Sorção e dessorção do diuron em quatro latossolos brasileiros

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

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