Degradation of chlorpyrifos in humid tropical soils

Chai, Lian-Kuet; Wong, Mee-Hua; Hansen, Hans Christian Bruun

doi:10.1016/j.jenvman.2013.04.005

Cited by 51 publications

(21 citation statements)

References 17 publications

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“…Chlorpyrifos is highly lipophilic (log K OW = 4.7, Tomlin 2006) and sorbs strongly on soils (Gebremariam et al 2011); however, its principal degradation product can present null sorption on soils with pH>6. Chlorpyrifos can be quickly degraded or be highly persistent (Chu et al 2008;Liang et al 2011;Zhang et al 2012) with a slower degradation rate in subsoil (half-life of 173-257 days) (Chai et al 2013). Chlorothalonil is lipophilic (log K OW =2.92, Tomlin 2006) with affinity for functional groups of organic matter (OM) of soils (Patakioutas and Albanis 2002;Piwowarczyk and Holden 2012).…”

Section: Introductionmentioning

confidence: 99%

Sorption-desorption behavior of pesticides and their degradation products in volcanic and nonvolcanic soils: interpretation of interactions through two-way principal component analysis

Báez

Espinoza

Silva

et al. 2015

Environ Sci Pollut Res

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Sorption-desorption behavior of six pesticides and some degradation products was assessed on seven agricultural volcanic and nonvolcanic soils belonging to Andisol, Ultisol, Mollisol, and Alfisol orders. The global interpretation of sorption data was performed by principal component analysis. Results showed exceptionally high sorption of glyphosate and aminomethylphosphonic acid (AMPA) (the breakdown product) on volcanic soils (K f > 1500 μg(1 - 1 / n) mL(1 / n) g(-1)) related mainly to contents of amorphous aluminum oxides (Andisols) and crystalline minerals (Ultisols). The lower sorption on nonvolcanic soils was associated to low organic matter contents and lack of significant minerals. Metsulfuron-methyl and 3,5,6-trichloro-2-pyridinol (metabolite of chlorpyrifos) were weakly to substantially sorbed on Andisols and Ultisols, but the first one was not sorbed at pH > 6.4, including nonvolcanic soils. The metabolite of diazinon, 2-isopropyl-4-methyl-6-hydroxypyrimidine, was weakly sorbed on all soils (K f = 0.4 to 3.6 μg(1 - 1 / n) mL(1 / n) g(-1)). Acidic compounds would be lixiviated in Mollisols and Alfisols, but they could leach also in Andisols and Ultisols if they reach greater depths. Atrazine and deethylatrazine sorption was related to organic carbon content; therefore, they were weakly retained on nonvolcanic soils (K f = 0.7 to 2.2 μg(1 - 1 / n) mL(1 / n) g(-1)). Chlorpyrifos was highly sorbed on all soils reaching K OC values of >8000. Finally, the significant retention of chlorothalonil and diazinon on Mollisols and Alfisols in spite of their low OC contents showed the contribution of clay minerals in the sorption process.

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Section: Introductionmentioning

confidence: 99%

Sorption-desorption behavior of pesticides and their degradation products in volcanic and nonvolcanic soils: interpretation of interactions through two-way principal component analysis

Báez

Espinoza

Silva

et al. 2015

Environ Sci Pollut Res

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“…In the present study, the dissipation kinetics of thiram in soil was performed by plotting the residue concentration against time and the dissipation of thiram was expressed in terms of half-life (t½). The concentration of thiram remaining in the soil (Equation [1]) and the halflife of thiram (Equation [2]) were fitted by the first-order kinetics (Chai et al, 2013). The variables defined are as follows: Ct (mg kg Pesticide transport processes in the field are complex and difficult to describe.…”

Section: Dissipation Kinetics Of Thirammentioning

confidence: 99%

Comparative study on the dissipation of thiram in two type of soils at oil palm (Elaeis guineensis Jacq.) nursery

Maznah

Muhamad

Sahid

et al. 2018

Chil. j. agric. res.

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The dithiocarbamate fungicide thiram is extensively used in oil palm (Elaeis guineensis Jacq.) nurseries for protecting oil palm seedlings from diseases caused by Melanconium, Glomerella and Rhizoctonia sp. The factors affecting thiram dissipation were studied under tropical conditions at two experimental sites situated in oil palm nurseries with two soil types namely: Clay loam and sandy clay loam. The field experimental plots were treated with thiram at two dosages (using the knapsack sprayers) (1) at the recommended dosage (25.6 g ai plot -1 ) and (2) at double the recommended dosage (51.2 g ai plot -1 ). Thiram residue was detected in the sandy clay loam and clay loam soils on treatment day (0 day) and from 1 to 3 d after treatment (DAT), respectively. The level of residue detected increased in soil depth. The results demonstrated that thiram dissipation was influenced by soil properties such as organic matter and clay content, and preferential flow was found to be the main pathway of thiram in the soil profile. The dissipation of thiram residue was observed in both the clay loam and sandy clay loam soils, to the depth of 50 and 30 cm of the soil profile, respectively, and the half-life was found to be less than 1 d. These findings suggest that thiram is safe for use as a foliar application on oil palm seedlings due to its short life span in the soil and its low risk potential for groundwater contamination.

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“…The calculation for dissipation kinetics of hexaconazole in the soil was done by plotting the residue concentration against time. The concentration and halflife of hexaconazole were fitted by the first-order kinetics equations, C t =C 0 e (−kt) and t ½ =ln 2/k, respectively (Chai et al 2013;Liang et al 2011). To get a straight line, the logarithmic equation was used, ln C t =ln C 0 −kt , with variables defined as follows: C t is the concentration at time t, C 0 is the initial concentration, k is the rate constant, and t ½ is the halflife.…”

Section: Dissipation Kinetics Studymentioning

confidence: 99%

Dissipation of the fungicide hexaconazole in oil palm plantation

Maznah

Muhamad

Sahid

et al. 2015

Environ Sci Pollut Res

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Hexaconazole is a potential fungicide to be used in the oil palm plantation for controlling the basal stem root (BSR) disease caused by Ganoderma boninense. Therefore, the dissipation rate of hexaconazole in an oil palm agroecosystem under field conditions was studied. Two experimental plots were treated with hexaconazole at the recommended dosage of 4.5 g a.i. palm(-1) (active ingredient) and at double the recommended dosage (9.0 g a.i. palm(-1)), whilst one plot was untreated as control. The residue of hexaconazole was detected in soil samples in the range of 2.74 to 0.78 and 7.13 to 1.66 mg kg(-1) at the recommended and double recommended dosage plots, respectively. An initial relatively rapid dissipation rate of hexaconazole residues occurred but reduced with time. The dissipation of hexaconazole in soil was described using first-order kinetics with the value of coefficient regression (r (2) > 0.8). The results indicated that hexaconazole has moderate persistence in the soil and the half-life was found to be 69.3 and 86.6 days in the recommended and double recommended dosage plot, respectively. The results obtained highlight that downward movement of hexaconazole was led by preferential flow as shown in image analysis. It can be concluded that varying soil conditions, environmental factors, and pesticide chemical properties of hexaconazole has a significant impact on dissipation of hexaconazole in soil under humid conditions.

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Degradation of chlorpyrifos in humid tropical soils

Cited by 51 publications

References 17 publications

Sorption-desorption behavior of pesticides and their degradation products in volcanic and nonvolcanic soils: interpretation of interactions through two-way principal component analysis

Sorption-desorption behavior of pesticides and their degradation products in volcanic and nonvolcanic soils: interpretation of interactions through two-way principal component analysis

Comparative study on the dissipation of thiram in two type of soils at oil palm (Elaeis guineensis Jacq.) nursery

Dissipation of the fungicide hexaconazole in oil palm plantation

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