Adsorption, Desorption and Mobility of Four Commonly Used Pesticides in Malaysian Agricultural Soils

Cheah, U. B.; Kirkwood, R. C.; Lum, K. Y.

doi:10.1002/(sici)1096-9063(199705)50:1<53::aid-ps558>3.0.co;2-p

Cited by 79 publications

(26 citation statements)

References 33 publications

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“…Similar results have been reported earlier for the sorption of isoxaflutole 11. Positive correlation between adsorption and soil organic matter and clay content have also been reported for 2,4‐D and lindane 12. The negative correlation between K F and pH could be attributed to the fact that electron‐rich moieties present in the molecule become protonated at lower pH (acidic) and protonated species (cation) can easily be adsorbed onto negatively charged soil particles.…”

Section: Resultssupporting

confidence: 86%

Adsorption–desorption behaviour of flufenacet in five different soils of India

Gajbhiye

Gupta

2001

Pest Management Science

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Adsorption-desorption of the herbicide flufenacet (FOE 5043) has been studied in five soils from different locations in India (Delhi, Ranchi, Nagpur, Kerala and Assam) varying in their physicochemical properties. The organic matter (OM) content varied from 0.072 to 0.864%, clay content from 2.5 to 43.7% and pH from 4.45 to 8.35. The adsorption studies were carried out using a batch equilibration technique. Ten grams of soil were equilibrated with 20 ml of aqueous 0.01 M CaCl2 solution containing different concentrations (0-30 mg litre-1) of flufenacet. After equilibration, an aliquot of supernatant was taken out for analysis. During desorption, the amount withdrawn for analysis was replenished with fresh 0.01 M CaCl2 solution and further equilibrated. Desorption studies were carried out with the 30 mg litre-1 concentration of flufenacet only. The adsorption studies revealed that there was moderate to high adsorption of flufenacet considering the comparatively low organic carbon content in the five test soils. Average Kd values ranged from 0.77 to 4.52 and Freundlich KF values from 0.76 to 4.39. The highest adsorption was observed in Kerala soil (OM 0.786%; clay 25%; pH 4.45) followed by Ranchi, Nagpur and Delhi soils, and the lowest in Assam soil (OM 0.553%; clay 2.5%; pH 6.87). The trend in adsorption could be attributed to the chemical nature of flufenacet and the physicochemical properties of the soil such as pH, OM and clay contents. OM and clay contents were positively correlated whereas pH was negatively correlated. Soils having low pH, high OM and high clay contents showed higher adsorption. Desorption studies revealed that there was a hysteresis effect in all the soils. Hysteresis coefficient values (ratio of n(ad) and n(des)) varied from 0.09 to 0.45. The study implies that, because of its moderate to high adsorption, flufenacet is likely to persist in soil for some time. However, the possibility of its movement by leaching or surface run off is less.

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Section: Resultssupporting

confidence: 86%

Adsorption–desorption behaviour of flufenacet in five different soils of India

Gajbhiye

Gupta

2001

Pest Management Science

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“…These values are high and confirm earlier findings that glyphosate is strongly sorbed to soil materials 1. 3–6 It should be kept in mind that the sorption of glyphosate decreases with increasing pH and decreasing ionic strength 2. 4, 7 Thus, the actual sorption coefficient during the column transport experiments was probably lower than those that were obtained under batch conditions, not even considering kinetic effects of diffusion and sorption.…”

Section: Resultssupporting

confidence: 86%

“…Several studies show that glyphosate, one of the most frequently used herbicides worldwide, is strongly sorbed by soil materials 1–7. Consequently, the leaching risk for this compound in soils is generally regarded to be low.…”

Section: Introductionmentioning

confidence: 99%

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[14C]Glyphosate transport in undisturbed topsoil columns

Jonge¹,

Jonge²,

Jacobsen³

2000

Pest Manag. Sci.

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Although glyphosate (N-(phosphonomethyl)glycine) is one of the most frequently used herbicides, few controlled transport experiments in undisturbed soils have been carried out to date. The aim of this work was to study the in¯uence of the sorption coef®cient, soil-glyphosate contact time, pH, phosphorus concentration and colloid-facilitated transport on the transport of [ 14 C]glyphosate in undisturbed top-soil columns (20 cm height Â 20 cm diameter) of a sandy loam soil and a sandy soil. Batch sorption experiments showed strong Freundlich-type sorption to both soil materials. The mobility of glyphosate in the soil columns was strongly governed by macropore¯ow. Consequently, amounts of glyphosate leached from the macroporous sandy loam soil were 50±150 times larger than from the sandy soil. Leaching rates from the sandy soil were not affected by soil-glyphosate contact time, whereas a contact time of 96 h strongly reduced the leaching rates from the sandy loam soil. The role of pH and phosphorus concentration in solution was relatively unimportant with respect to total glyphosate leaching. The contribution of colloid-facilitated transport was`1 to 27% for the sandy loam and`1 to 52% for the sandy soil, depending on soil treatment. The risk for glyphosate leaching from the top-soils seems to be limited to conditions where pronounced macropore¯ow occurs shortly after application.

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“…Glyphosate is today often found in surface waters and occasionally also in groundwater, despite strong sorption to soil materials (Hance, 1976; Piccolo et al, 1994; de Jonge and de Jonge, 1999). Studies investigating the mobility of glyphosate in soil also indicate that the potential for leaching appears to be limited (Cheah et al, 1997; Fomsgaard et al, 2003), although there are studies showing that leaching may occur (Kjaer et al, 2003).…”

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confidence: 99%

Laboratory and Lysimeter Studies of Glyphosate and Aminomethylphosphonic Acid in a Sand and a Clay Soil

Bergström

Börjesson²,

Stenström³

2011

J of Env Quality

135

108

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Due to the increasing concern about the appearance of glyphosate [N-(phosphonomethyl)glycine] and its major metabolite aminomethylphosphonic acid (AMPA) in natural waters, batch laboratory and lysimeter transport studies were performed to assess the potential for leaching of the compounds in two agricultural soils. Unlabeled and 14 C-labeled glyphosate were added at a rate corresponding to 1.54 kg a.i. ha −1 on undisturbed sand and clay columns. Leachate was sampled weekly during a period of 748 d for analyses of glyphosate, AMPA, total 14 C, and particle-bound residues. Topsoil and subsoil samples were used for determination of glyphosate adsorption, glyphosate degradation, and formation of AMPA and its degradation. Th e infl uence of adsorption on glyphosate degradation was confi rmed, giving very slow degradation rate in the clay soil (half-life 110-151 d). Th e kinetics of AMPA residues suggest that although AMPA is always more persistent than glyphosate when formed from glyphosate, its degradation rate can be faster than that of glyphosate. Th e kinetics also suggest that apart from glyphosate being transformed to AMPA, the sarcosine pathway can be just as signifi cant. Th e long persistence of glyphosate was also confi rmed in the lysimeter study, where glyphosate+AMPA residues constituted 59% of the initial amount of glyphosate added to the clay soil 748 d after application. Despite large amounts of precipitation in the autumn and winter after application, however, these residues were mainly located in the topsoil, and only 0.009 and 0.019% of the initial amount of glyphosate added leached during the whole study period in the sand and clay, respectively. No leaching of AMPA occurred in the sand, whereas 0.03 g ha −1 leached in the clay soil.

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Adsorption, Desorption and Mobility of Four Commonly Used Pesticides in Malaysian Agricultural Soils

Cited by 79 publications

References 33 publications

Adsorption–desorption behaviour of flufenacet in five different soils of India

Adsorption–desorption behaviour of flufenacet in five different soils of India

[14C]Glyphosate transport in undisturbed topsoil columns

Laboratory and Lysimeter Studies of Glyphosate and Aminomethylphosphonic Acid in a Sand and a Clay Soil

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