Half-Life of Glyphosate on the Control of Water Hyacinths in Water Tanks

Souza, Evandro Luiz Corrêa de; Foloni, Luiz Lonardoni; Filho, José Teixeira; Velini, Edivaldo Domingues; Siono, Luis Marcelo; Silva, José R. M.

doi:10.4236/jwarp.2017.95030

Cited by 9 publications

(11 citation statements)

References 15 publications

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“…The results are similar to those found by [25], showing that from glyphosate metabolization and subsequent plant control or death effectiveness, the decomposition process of dead plants released the product in the reservoir water keeping the contents, even if low, but superior to the reservoirs that received direct application of the product.…”

Section: Resultssupporting

confidence: 85%

Water Hyacinth Control by Glyphosate Herbicide and Its Impact on Water Quality

Souza¹,

Filho²,

Velini³

et al. 2020

JWARP

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The aim of this study was to evaluate the herbicide glyphosate under aquatic environment conditions, in a controlled and closed experimental field, in the management of water hyacinth (Eichhornia crassipes) in reservoirs. Twenty reservoirs (polyethylene water tanks) with storage capacity of 1000 liters were used, without water flow and without evapotranspired water replacement (worst case), being 04 for each treatment. The adult plants were placed in the water tanks to provide 90% surface occupation of the reservoir. Five treatments with four repetitions were considered, being: 1) Reservoir colonized by water hyacinth without control; 2) Reservoir colonized by water hyacinth, controlled by glyphosate; 3) Reservoir colonized by water hyacinth, controlled by freezing; 4) Reservoir without water hyacinth and glyphosate application and 5) Reservoir without water hyacinth and no glyphosate application. The glyphosate herbicide was used at the highest recommended dose, 7.0 L•ha −1 or 3360 g of acid equivalent per ha, applied using carbon dioxide precision equipment (backpack sprayer), providing a flow rate of 200 L•ha −1. The water samples were collected at the time of application, 6, 12, 18 and 24 hours after application and also at 2, 4, 8, 16, 32 and 64 days after application, in the morning, always at the same time, also between 8 and 9 h. The method used for determination of residues was by high performance liquid chromatography (HPLC) and mass spectrometry with a mass selective detector. Low concentrations of glyphosate and aminomethylphosphonic acid (AMPA) were found in both reservoirs that received application of the product. The half-life of glyphosate in water to the reservoirs with water hyacinth was 11 days and in the reservoirs without water hyacinth was 21 days.

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Section: Resultssupporting

confidence: 85%

Water Hyacinth Control by Glyphosate Herbicide and Its Impact on Water Quality

Souza¹,

Filho²,

Velini³

et al. 2020

JWARP

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“…According to the World Health Organization (WHO) (39), application of glyphosate has increased annually. It has also long halflife in aquatic environments (13) and its residues can remain stable in foods for a year or even more, even if the foods are frozen, dried or processed (40). It also damages macrophytes as well as non-target organisms such as common carp through deterioration offish habitats and food (31).…”

Section: Discussionmentioning

confidence: 99%

“…Glyphosate is highly soluble in water (10500 mL.L -1 ) and its half-life, depending on the environmental conditions, is between 3.5 and 70 days (12). However, Souza et al (13) pointed out that the half-life of glyphosate in freshwater was between 28 and 87 days. It was thought that since EPSP enzyme was not found in animals, so glyphosate is not toxic to them.…”

Section: Introductionmentioning

confidence: 99%

Acute toxicity effect of glyphosate on survival rate of common carp, Cyprinus carpio

Vajargah

Yalsuyi

Sattari

et al. 2018

Environ Health Eng Manag

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Background: Herbicides are usually used to control weeds and some of them like glyphosate are nonselective herbicides. Aquatic environments are usually the last destinations of agricultural pesticides, which disrupt the metabolic processes of organisms. Thus, the aim of this study was to evaluate acute toxicity of glyphosate on the survival rate of common carp, Cyprinus carpio. Methods: A total of 135 common carp averaged 7 ± 0.8 g in weight were exposed to 0, 25, 50, 75, 100, 125, 150, 175 and 200 mL.L-1 glyphosate (15 fish in each treatment, with triplicates) for 96 hours. The aquariums capacity was 98 L in volume (80 × 35 × 35 cm) and physicochemical parameters were the same for all groups (pH 7.4-8, temperature = 26 ± 1ºC, DO = 7 mg.L-1 and total hardness of 190 mg CaCO 3). LC 10 , LC 20 , LC 30 , LC 40 , LC 50 , LC 60 , LC 70 , LC 80, LC 90 and LC 95 of glyphosate were calculated at 24, 48, 72 and 96 hours after adding glyphosate using probit test. Results: Mortality was observed in all treatments which exposed to higher than 50 mL.L-1 after 96 hours. The results showed that 96-hour LC 50 of glyphosate for common carp was 92.71 mL.L-1. The fish exposed to different concentrations of glyphosate showed clinical signs such as increased mucus secretion, skin darkening and death with mouth open. Conclusion: Glyphosate disrupts the synthesis of amino acids in plants by inhibiting enzymatic activity of 5-enolpyruvylshikimate-3-phosphate synthase (EPSP). This enzyme is absent in animals. However, glyphosate is toxic for common carp.

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“…The uses of herbicides for controlling unwanted plants in land and water have increased enormously over the past few decades in both developing and developed countries (Wang et al, 2012;Stone et al, 2014;Souza et al, 2017). However, in order to understand the resultant risks to environment and population health requires improvement in existing knowledge with regards to the fate of herbicides residues in ambient water bodies.…”

Section: Introductionmentioning

confidence: 99%

“…The specific objectives were to: (1) assess the attached concentrations of two herbicides (Fluridone and Glyphosate) in sediment; (2) compare the concentrations of Fluridone and Glyphosate in the water column and sediment; and (3) evaluate the effects of sediment leachate/washing on the particleattached Fluridone and Glyphosate concentrations. Fluridone and Glyphosate are widely used herbicides for controlling unwanted aquatic plants and phytoplankton in ambient water, and the presence of these herbicides in water and sediment environment has a potential to affect the habitat of aquatic lives (Fox et al, 1994;Parsons et al, 2009;Antunes et al, 2010;Crowe et al, 2011;Scott et al, 2017;Souza et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Assessing Glyphosate and Fluridone Concentrations in Water Column and Sediment Leachate

Pandey

Caudill

Lesmeister³

et al. 2019

Front. Environ. Sci.

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Purpose: In recreational water bodies, herbicides are widely used for controlling unwanted weeds, and impacts of herbicide residues on health risks to aquatic ecosystem is a serious concern. This study was aimed to improve the existing understanding of the deposition of herbicides from water column to bed sediment and leachate of herbicides from bed sediment to water column. We investigated the attachment of two herbicides with sediment and release from sediment: (1) Glyphosate; and (2) Fluridone. The goal of this study was to determine the deposition and release of Glyphosate and Fluridone in bed sediment of the Sacramento-San Joaquin River Delta.Materials and Methods: Field sampling was performed to collect water and sediment samples from Sacramento-San Joaquin River Delta. Bottom dredge sampler was used for collecting sediment samples and horizontal water bottle sampler was used for collecting water samples. A series of experiments were conducted to determine the attachment and release of Fluridone and Glyphosate from sediment at a different level of initial concentrations. For analyzing Fluridone and Glyphosate in sediment leachate and water, samples were processed using enzyme-linked immunosorbent assay (ELISA) based method.Results and Discussion: Observations showed that proportions of Glyphosate concentrations in water were higher than Fluridone concentrations in water, when both herbicides were inoculated in water in same quantity. On the contrary, the concentrations of Fluridone in sediment-bound leachate were higher than Glyphosate concentrations in sediment-bound leachate, regardless of the initial concentrations. Fluridone and Glyphosate concentrations in water column samples differed significantly (p < 0.05) over the time even initial concentrations of these herbicides were kept similar, which indicates that Fluridone interaction with water column was considerably different than the interaction of Glyphosate with the water column. Pandey et al. Herbicide Concentration in Water and Sediment LeachateConclusions: Bed sediment can be an important sink and source for release of Fluridone and Glyphosate from bed sediment to the water column of an ambient water body. Significant concentrations of herbicides were deposited in bed sediment of Sacramento-San Joaquin Delta, and eventually the high concentrations of herbicides were observed in sediment leachate. Improved understanding of this important release pathway can provide much needed information to adequately address the impacts of particle attached herbicides on aquatic and ecological environment of a water body.Keywords: fluridone and glyphosate in ambient water, particle attached herbicides, herbicides leachate from sediment, sediment and water column interaction, deposition and resuspension

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Half-Life of Glyphosate on the Control of Water Hyacinths in Water Tanks

Cited by 9 publications

References 15 publications

Water Hyacinth Control by Glyphosate Herbicide and Its Impact on Water Quality

Water Hyacinth Control by Glyphosate Herbicide and Its Impact on Water Quality

Acute toxicity effect of glyphosate on survival rate of common carp, Cyprinus carpio

Assessing Glyphosate and Fluridone Concentrations in Water Column and Sediment Leachate

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