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 412692
Title Methods for estimating the vapour pressure of organic chemicals; Application to five pesticides
Author(s) Leistra, M.
Source Wageningen : Alterra (Alterra-report 2215) - 60
Department(s) Alterra - Centre for Water and Climate
Publication type Research report
Publication year 2011
Keyword(s) dampdruk - vervluchtiging - pesticiden - chloorthalonil - chloorpyrifos - lindaan - pirimicarb - chinolinefungiciden - vapour pressure - volatilization - pesticides - chlorothalonil - chlorpyrifos - lindane - quinoline fungicides
Categories Chemistry (General) / Chemical Control
Abstract When studying and modelling the volatilisation of pesticides from crops, their vapour pressure is an essential property. In the critical evaluation of vapour pressures stated by various sources, problems were encountered. Therefore, an inventory was made of readily-usable methods for estimating vapour pressures of organic chemicals, for checking the stated values. When applied to some of the five example pesticides, the estimates were at the same level as the stated values. However, for other pesticides there were substantial differences. Unfortunately, there is a wide range of uncertainty in both measurement and estimation of comparatively low vapour pressures. The solid (crystalline) and sub-cooled-liquid states of the chemical have to be distinguished when specifying and using vapour pressures, because the latter can be much higher. The influence of the uncertainty in vapour pressure on the source strength of volatilisation from plants is illustrated in a few computations. Only data for pesticides with accurately known vapour pressure are usable in the development and testing of computation models on the volatilisation from crops.
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