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Uptake and persistence of pesticides in plants: Measurements and model estimates for imidacloprid after foliar and soil application

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Abstract.
The uptake and persistence behaviour of the insecticide imidacloprid in tomato plants treated by (i) foliar
spray application and (ii) soil irrigation was studied using two plant uptake models. In addition to a
pesticide deposition model, a dynamic root uptake and translocation model was developed, and both
models predict residual concentrations of pesticides in or on fruits. The model results were experimentally
validated. The fraction of imidacloprid ingested by the human population is on average 10−2 to 10−6,
depending on the time between pesticide application and ingestion, the processing step, and the application
method. Model and experimentally derived intake fractions deviated by less than a factor of 2 for
both application techniques. Total imidacloprid residues were up to five times higher in plants treated by
foliar spray application than by soil irrigation. However, peeling tomatoes treated by spray application
reduces the human intake fraction by up to three orders of magnitude. Model calculations suggest that
drip-irrigation in a closed hydroponic system minimizesworker and consumer exposure to pesticides and
prevents runoff of pesticide by spray drift and leaching into the environment.

Keywords:
Pesticides
Plant uptake model
Persistence
Tomato
Human exposure

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 165 (2009) 683–689

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

LINGKUNGAN HIDUP

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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