Effects of fertilizer on insecticides adsorption and biodegradation in crop soils

Rouchaud, Jean; Thirion, A.; Wauters, A.; Steene, Frans Van De; Benoit, F.; Ceustermans, N.; Gillet, Joseph; Marchand, S; Vanparys, L.

doi:10.1007/bf00203913

Cited by 34 publications

(7 citation statements)

References 7 publications

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“…It should be noted, however, that often the half-lives of insecticides at termiticidal application rates (50±1000 mg kg À1 ) are much higher than those found at normal agricultural rates (`1± 10 mg kg À1 ). 4,15 In the case of chlorpyrifos, a biphasic degradation was evident from the Figure, showing an initial rapid rate followed by a slower rate of degradation. Indeed, within the ®rst 90 days, some 50±60% of chlorpyrifos had disappeared from the two bedding materials.…”

Section: Quantification Of Degradation Kinetics Of the Insecticidesmentioning

confidence: 93%

Degradation of bifenthrin, chlorpyrifos and imidacloprid in soil and bedding materials at termiticidal application rates

1999

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Organophosphorus, pyrethroid and chloronicotinyl insecticides have been used to control termites in building structures in recent years. We investigated the degradation behaviour of three insecticides (bifenthrin, chlorpyrifos and imidacloprid) at termiticidal application rates under standard laboratory conditions (25°C, 60% ®eld moisture capacity and darkness) for 24 months. The study was carried out on one soil and two bedding materials (sand-dolomite and quarry sand), which are commonly used under housing in Australia. Experiments were also conducted to examine the effect of soil moisture on the degradation of these insecticides. Insecticide residues in the samples collected at different days after application were measured by high performance liquid chromatography (HPLC). The rate of degradation of bifenthrin and imidacloprid insecticides was adequately described by a ®rst-order kinetic model (r 2 = 0.93±0.97). However, chlorpyrifos degradation was biphasic, showing an initial faster degradation followed by a slower rate. Therefore, the degradation data during the slower phase only (after a two-month period) followed the ®rst-order law (r 2 = 0.95). Soil moisture had little effect on degradation of imidacloprid and bifenthrin. Among the three insecticides, bifenthrin and imidacloprid were most stable and chlorpyrifos the least. Chlorpyrifos showed a major loss (75±90%) of residue during the 24 months incubation period. In the bedding materials, simultaneous accumulation of the primary metabolite of chlorpyrifos, TCP (3,5,6-trichloro-2-pyridinol) was observed. Hydrolysis appeared to have caused the observed rapid loss of chlorpyrifos, especially in the highly alkaline bedding materials (sand-dolomite and quarry sand).

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Section: Quantification Of Degradation Kinetics Of the Insecticidesmentioning

confidence: 93%

Degradation of bifenthrin, chlorpyrifos and imidacloprid in soil and bedding materials at termiticidal application rates

1999

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“…Organic matter is known to be closely associated with the inorganic soil components and it provides a large percentage of the surface area in soils because of its porous molecular structure (Felsot & Dahm 1979). The soil organic matter progressively loses oxygen by a qualification process and thus the chemical functions, adsorb the insecticides and increase their soil persistence (Rouchaud et al 1996). Hill (1985) reported that dissipation of pyrethroids was slower with a 50% reduction from initial concentration in 20 weeks for soil with high organic matter content.…”

Section: Gc Conditionmentioning

confidence: 99%

The Persistence of Deltamethrin in Malaysian Agricultural Soils

Sahid¹,

Mazlinda

Tayeb

2015

JSM

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Studies on the persistence and dissipation of deltamethrin (C 22 H 19 Kajian ke atas kekekalan dan kadar resapan deltametrin (C 22 H 19 Br 2 NO 3 ) dalam dua jenis tanah (tanah gambut dan tanah liat berkelodak) telah dijalankan dalam keadaan makmal. Analisis ini dilakukan dengan menggunakan gas kromatografi (GC) dilengkapi dengan elektron pengesan tangkapan (ECD). Kadar resapan deltametrin adalah lebih tinggi dalam

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“…Imidacloprid has a high water solubility (510 mg/l at 20°C) and an apparent high persistence in soil in laboratory conditions (average DT50=190 days). However field experiments have demonstrated a greater rate of degradation, probably due to microbial activity (average DT50=48 days [8,9]. Pyrimethanil with a water solubility of 121 mg/l at 25°C is less soluble than imidacloprid, with an average DT50 of 30 days [11].…”

Section: Introductionmentioning

confidence: 99%

Imidacloprid and pyrimethanil soil sorption

et al. 2001

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-The sorption of imidacloprid and pyrimethanil was measured in different soils of southern Europe. Pyrimethanil sorption (Kf=1.2-4.60) was higher than that of imidacloprid (Kf=0.31-1.99). Sorption was influenced by organic carbon content and increased with time when the soil was incubated at 25°C and 35% soil water content. Over a period of 14 days, the distribution coefficient between solid (soil) and solution phases increased by orders of magnitude of 2 and 4 respectively, for imidacloprid and pyrimethanil. The increment is consistent with the degradation rate measured, supporting the hypothesis of the two sites of sorption. Care should be taken when such values are used to predict pesticide fate in soil, particularly for regulatory purposes during pesticide registration.

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Effects of fertilizer on insecticides adsorption and biodegradation in crop soils

Cited by 34 publications

References 7 publications

Degradation of bifenthrin, chlorpyrifos and imidacloprid in soil and bedding materials at termiticidal application rates

Degradation of bifenthrin, chlorpyrifos and imidacloprid in soil and bedding materials at termiticidal application rates

The Persistence of Deltamethrin in Malaysian Agricultural Soils

Imidacloprid and pyrimethanil soil sorption

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