Adsorption of Herbicide Butachlor in Cultivated Soils of Golestan Province, Iran

Armanpour, Sahar; Bing, Liang

doi:10.4236/gep.2015.33002

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…Samples of a clayey paddy soil were collected from the rice farming area near the city of Rasht, Guilan Province, Iran (longitude: 49°31'56.29''E; latitude: 37°13'37.02''N; altitude: 13 m) on the southern coastline of the Caspian Sea (Appendix A Section S2). Along with BUT (application rate of 4 L/ha; Armanpour and Bing, 2015), the organophosphate insecticide diazinon (30 kg/ha) and the fungicide edifenphos (1 L/ha) are the most currently applied pesticides in the area (Alighardashi et al, 2017), whereas application of SM has not been reported.…”

Section: Experimental Soilsmentioning

confidence: 99%

“…Resulting herbicide aqueous solutions were filter-sterilized through 0.2 µm syringe filters for soil spiking. The final herbicide concentrations of 15 or 150 µg/g were equivalent to environmental or severe chronic concentrations, respectively (Armanpour andBing, 2015, Lefrancq et al, 2017). Spiking of aqueous solutions was adjusted to reach a typical field water content of 20% (W/W) or saturated conditions of 100% (W/W) in crop and paddy soil experiments, respectively (See Appendix A Table S3).…”

Section: Experimental Set-up and Operationsmentioning

confidence: 99%

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Dissipation of S-metolachlor and butachlor in agricultural soils and responses of bacterial communities: Insights from compound-specific isotope and biomolecular analyses

Torabi

Wiegert

Guyot

et al. 2020

Journal of Environmental Sciences

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The soil dissipation of the widely used herbicides S-metolachlor (SM) and butachlor (BUT) was evaluated in laboratory microcosms at two environmentally relevant doses (15 and 150 µg/g) and for two agricultural soils (crop and paddy). Over 80% of SM and BUT were dissipated within 60 and 30 days, respectively, except in experiments with crop soil at 150 µg/g. Based on compound-specific isotope analysis (CSIA) and observed dissipation, biodegradation was the main process responsible for the observed decrease of SM and BUT in the paddy soil. For SM, biodegradation dominated over other dissipation processes, with changes of carbon isotope ratios (Δδ 13 C) of up to 6.5‰ after 60 days, and concomitant production of ethane sulfonic acid (ESA) and oxanilic acid (OXA) transformation products.In crop soil experiments, biodegradation of SM occurred to a lesser extent than in paddy soil, and sorption was the main driver of apparent BUT dissipation. Sequencing of the 16S rRNA gene showed that soil type and duration of herbicide exposure were the main determinants of bacterial community variation. In contrast, herbicide identity and spiking dose had no significant effect. In paddy soil experiments, a high (4:1, V/V) ESA to OXA ratio for SM was observed, and phylotypes assigned to anaerobic Clostridiales and sulfur reducers such as Desulfuromonadales and Syntrophobacterales were dominant for both herbicides. Crop soil 2 microcosms, in contrast, were associated with a reverse, low (1:3, V/V) ratio of ESA to OXA for SM, and Alphaproteobacteria, Actinobacteria, and Bacillales dominated regardless of the herbicide. Our results emphasize the variability in the extent and modes of SM and BUT dissipation in agricultural soils, and in associated changes in bacterial communities.

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Section: Experimental Soilsmentioning

confidence: 99%

Section: Experimental Set-up and Operationsmentioning

confidence: 99%

Dissipation of S-metolachlor and butachlor in agricultural soils and responses of bacterial communities: Insights from compound-specific isotope and biomolecular analyses

Torabi

Wiegert

Guyot

et al. 2020

Journal of Environmental Sciences

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“…Among anilide pesticides, S-Metolachlor, Acetochlor and Alachlor are the most applied herbicides worldwide (Atwood and Paisley-Jones, 2017), Butachlor is commonly used in Indian rice fields (Armanpour and Bing, 2015), while Metalaxyl is a common fungicide in European vineyards (Kom arek et al, 2010). Anilide pesticides are mainly made of carbon (z 60%, Table 1) and change in d 13 C values have been used to evaluate chloroacetanilide degradation (Elsayed et al, 2014;Alvarez-Zaldívar et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Carbon and nitrogen stable isotope fractionation during abiotic hydrolysis of pesticides

et al. 2018

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Compound-specific Stable Isotope Analysis (CSIA) has been recently established as a tool to study pesticide degradation in the environment. Among degradative processes, hydrolysis is environmentally relevant as it can be chemically or enzymatically mediated. Here, CSIA was used to examine stable carbon and nitrogen isotope fractionation during abiotic hydrolysis of legacy or currently used pesticides (chloroacetanilide herbicides: Acetochlor, Alachlor, S-Metolachlor and Butachlor, acylalanine fungicide: Metalaxyl, and triazine herbicide: Atrazine). Degradation products analysis and CN dual-CSIA allowed to infer hydrolytic degradation pathways from carbon and nitrogen isotopic fractionation. Carbon isotopic fractionation for alkaline hydrolysis revealed similar apparent kinetic isotope effects (AKIE = 1.03-1.07) for the 6 pesticides, which were consistent with S2 type nucleophilic substitutions. Neither enantio-selectivity (EF ≈ 0.5) nor enantio-specific isotope fractionation occurred during hydrolysis of R (AKIE = 1.04 ± 0.01) and S (AKIE = 1.04 ± 0.02) enantiomers of a racemic mixture of Metalaxyl. Dual element isotope plots enabled to tease apart CCl bond breaking of alkane (Λ ≈ ε/ε ≈ 0, Acetochlor, Butachlor) and aromatic π-system (Λ ≈ 0.2, Atrazine) from CO bond breaking by dealkylation (Λ ≈ 0.9, Metalaxyl). Reference values for abiotic versus biotic S2 reactions derived from carbon and nitrogen CSIA may be used to untangle pesticide degradation pathways and evaluate in situ degradation during natural and engineered remediation.

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“…The average value of the ACI and DTI percentage can be seen in the table below. Armanpour and Bing (2015), the Koc value for very mobile was <15 l / kg; for mobile which is 15-75 l/kg, for moderately mobile which is 75-500 l/kg; for slightly mobile which isi 500-4000 l/kg; and immobile which is >4000 l/kg [8]. Table 5 shows the organic-carbon coefficient (Koc) of Pb, Cd, Cu, and Zn.…”

Section: Fate In Citarum River Estuarymentioning

confidence: 97%

Fate and spatial distribution of Pb, Cd, Cu and Zn in the water column and in the surface sediment of Indonesian Estuary (Citarum River Estuary)

Fahimah

Oginawati²,

Suharyanto³

2020

E3S Web Conf.

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The Citarum River Estuary is an area where mixing among seawater and freshwater occurs since directly connected with the Java Sea. The different condition in estuary will affect heavy metal concentrations in the dissolved phase and suspended/deposited in sediment phase. In this study, fates and distributions from Pb, Cd, Cu and Zn were analyzed along 2 km from estuary mouth. Samples were analyzed by Flame AAS. The study began with water/sediment quality assessments, and fate and distribution analyses with Adsorption Capacity Indices (ACI), Dissolved Transport Indice (DTI), Koc, Kow, spatial distribution in water (3D) and sediment (2D) using MATLAB, and statistical analysis (ANOVA/Kruskal-Wallis). In conclusion, heavy metals sequence from the highest pollution level in water were: Zn > Pb > Cu > Cd, and in sediment were: Cd > Pb > Zn > Cu. Pb, Cd, Cu, and Zn had a tendency to be in sediment compared to water (ACI = 99.69% – 99.89%; DTI = 0.109% – 0.309%), slightly mobile (log Koc = 3.11 – 3.58), and hydrophobic (log Kow = 3.35 – 3.87). Pb and Cd showed significantly different concentrations in water columns (surface/midst/base) (p<0.05), in contrast to Cu and Zn. Pb, Cd, Cu, and Zn had insignificant concentration difference based on zone division from estuary mouth, both in water and sediment.

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Adsorption of Herbicide Butachlor in Cultivated Soils of Golestan Province, Iran

Cited by 9 publications

References 25 publications

Dissipation of S-metolachlor and butachlor in agricultural soils and responses of bacterial communities: Insights from compound-specific isotope and biomolecular analyses

Dissipation of S-metolachlor and butachlor in agricultural soils and responses of bacterial communities: Insights from compound-specific isotope and biomolecular analyses

Carbon and nitrogen stable isotope fractionation during abiotic hydrolysis of pesticides

Fate and spatial distribution of Pb, Cd, Cu and Zn in the water column and in the surface sediment of Indonesian Estuary (Citarum River Estuary)

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