Persistence of benfluralin in soil and its uptake by carrots

Businelli, Mario; Tafuri, F.; Scarponi, Luciano; Marucchini, Cesare

doi:10.1002/ps.2780060506

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…8 with the degradation rate constant sir (1 /sec) of pesticides in edible root, volume of edible root Vr (cm3) and concentration of chemicals in the root Cr (g/cm3). M = Ar X Vr X Cr (8) On the basis of the above considerations, the intake of pesticide IA (g) in the period t (sec) can be expressed by combining equations (2), (4), (7) and (8) as below.…”

Section: Loss By Metabolism/degradationmentioning

confidence: 99%

“…To date, the distribution of soil-treatment pesticides in edible roots has been studied using radiolabeled materials. [1][2][3][4][5][6][7][8][9] Studies have shown that more than 75% of the total amount of residue persisted in root peel when edible roots were exposed to lipophilic pesticides even though the peel accounts for only 10% of total weight.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Model of the Uptake of Non-Ionized Pesticides by Edible Root of Root Crops

et al. 2002

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A plant uptake model was developed to estimate the residual amount of non-ionized pesticides in the edible roots of root crops. An examination of the route of uptake of furametpyr (log Kow = 2.36) and pyriproxyfen (log Kow = 5.37) suggested that the more lipophilic of the two pesticides, pyriproxyfen, was mainly adsorbed by the root peel and incorporated by diffusion into the root core. On the other hand, the less lipophilic pesticide, furametpyr, was mainly taken up via the transpiration stream into the core through the root hairs. Based on the results, a mathematical model for the uptake of a pesticide into edible roots was developed based on the following route; (1) incorporation into the root core via the transpiration stream through the root hairs, (2) adsorption by the root peel, and (3) diffusion from the peel to the root core. To test the model, residual amounts of furametpyr and pyriproxyfen were analyzed and compared to those predicted when the pesticides were treated at one-tenth of the concentration in the model construction. Ratios of predicted to measured residual concentrations were 1.01-1.38 and 0.75-1.28 for furametpyr and pyriproxyfen, respectively, showing the effectiveness of the model as a predictive tool.

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Section: Loss By Metabolism/degradationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical Model of the Uptake of Non-Ionized Pesticides by Edible Root of Root Crops

et al. 2002

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“…Businelli and co-workers (53) studied the persistence of benfluralin in soil and its uptake by carrots.…”

Section: Herbicidesmentioning

confidence: 99%

Pesticide residues

Thornburg¹

1977

Anal. Chem.

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Validation of models on uptake of organic chemicals by plant roots

Polder

Hulzebos

Jager

1995

Enviro Toxic and Chemistry

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The fate of a substance is governed by the distribution of the substance among soil, water, air, and biota, and by the concentration of the substance and its altered forms existing over a period of time in these media. As vegetable food forms a major part of the diet of both human beings and of cattle, the contamination of plants will have a large influence on the total daily intake of a substance. In this report the application of soil‐plant transfer factors is investigated. The main goal was to find sufficient experimental data in the available literature, if possible adjusted for differences in experimental design, that could be used to evaluate the currently applied method in the uniform system for the evaluation of substances (USES). In this approach, concentrations in plant root and stem are estimated on the basis of an empirical relationship with the octanol/water partitioning coefficient. It was concluded that, for the purposes set in USES, the root concentration factor is an appropriate instrument for the estimation of residues in roots, whereas the application of the stem concentration factor is insufficient. Consequently, for aboveground plant parts, other approaches need to be explored, which can then be applied in the general risk assessment of substances.

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Persistence of benfluralin in soil and its uptake by carrots

Cited by 4 publications

References 6 publications

Mathematical Model of the Uptake of Non-Ionized Pesticides by Edible Root of Root Crops

Mathematical Model of the Uptake of Non-Ionized Pesticides by Edible Root of Root Crops

Pesticide residues

Validation of models on uptake of organic chemicals by plant roots

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