Validation of a methodology for modelling PCDD and PCDF intake via the foodchain.
The US EPA foodchain exposure methodology has been assessed, linking background concentrations of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in the atmosphere with eventual intake of these chemicals by humans via the foodchain.
The methodology is assessed against background environmental concentrations of PCDD/Fs and the background daily adult intake of PCDD/Fs in the UK diet comprising meats, vegetables, dairy produce, fish and miscellaneous food groups.
The environmental fate and transport of PCDD/Fs is estimated for each of the seventeen, 2,3,7,8-positional PCDD/F isomers individually from the atmospheric burden in the atmosphere and into the environmental medium or food product of interest.
The model predicts PCDD/F deposition rate and soil concentration to within ±50% of the measured 1-TEQ values.
For grass, the model underpredicts PCDD/F concentrations but the lack of a reliable and coherent data set precludes further investigation as to the likely causes.
The model performs well on food products, with the exception of potatoes (underpredicts by a factor of 20) and'other'vegetables (underpredicts by a factor of 3).
The total modelled PCDD/F intake via the diet is 61 pg 1. TEQ day-1 as opposed to the measured intakes of 69 pg I-TEQ day-1 (excluding plant foods) and 81 pg day-1 (including data for plant foods measured in a previous survey, and not representative of contemporary exposures). (...)
Mots-clés Pascal : Modélisation, Pollution air, Mesure concentration, Polluant, Chaîne alimentaire, Homme, Royaume Uni, Europe, Dibenzo-p-dioxine(polychloro), Dibenzofurane(polychloro)
Mots-clés Pascal anglais : Modeling, Air pollution, Concentration measurement, Pollutant, Trophic chain, Human, United Kingdom, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0385592
Code Inist : 002A14D05A. Création : 10/04/1997.