Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 425326
Title Pesticide volatilization from small surface waters : rationale of a new parameterization for TOXSWA
Author(s) Jacobs, C.M.J.; Adriaanse, P.I.
Source Wageningen : Alterra, Wageningen-UR (Alterra-report 2316) - 42
Department(s) CWC - Earth System Science and Climate Change
CWC - Environmental Risk Assessment
Wageningen Environmental Research
Publication type Research report
Publication year 2012
Keyword(s) pesticiden - vervluchtiging - waterverontreiniging - oppervlaktewater - modellen - pesticides - volatilization - water pollution - surface water - models
Categories Water Pollution
Abstract In the TOXSWA (TOXic substances in Surface WAters) model volatilization of pesticides from surface water is computed because it may be an important component of the mass balance of pesticides in water bodies. Here, we briefly review the physics of air-water gas exchange relevant in this context. A new parameterization of volatilization is proposed. This new TOXSWA parameterization would take into account key physical aspects of the air-water gas exchange process, while still fitting into the TOXSWA philosophy. It is recommended to cast the new parameterization into a micrometeorological framework, based on two atmospheric resistances and one aqueous resistance against gas transport. In this context, the dimensionless Henry coefficient is a crucial characteristic of the pesticides and determines whether atmospheric properties as modelled by the atmospheric resistances exert the main dynamic control on air-water gas exchange or the aqueous properties and resistance. Most pesticides will be subject to atmospherically controlled volatilization.
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