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Evaluation of model concepts on human exposure; Proposals for updating the most relevant exposure routes of CSOIL

Evaluatie van modelconcepten voor humane blootstelling; voorstellen voor herziening van de meest relevante blootstellingsroutes in CSOIL

Synopsis

With the human exposure model CSOIL proposals for the Intervention Values are derived. The main purpose of the evaluation of model concepts is to obtain adjusted methods for deriving Intervention Values according to the most recent views on the human exposure assessment to soil contaminants. The research is limited to the concepts of the most relevant routes of CSOIL, i.e. the ingestion of soil particles, the indoor inhalation of volatile compounds and the consumption of crops. Concepts of other human exposure models have been selected which might be useful for improving CSOIL. For the soil ingestion route it is proposed to implement the deliberate soil ingestion for children and to introduce an exposure duration separate from the daily intake rate. Further, a distinction should be made between the oral and inhalative absorption. For the inhalation of volatile compounds the inclusion of a convective flux into the volatilisation module has been proposed. There is a recommendation to discuss the use of the respirable fraction for the inhalative route. Except for incorporating the influence of the soil pH, no further adjustments are proposed for the uptake of metals in roots and aboveground plant parts. For the uptake of organic compounds in roots and aboveground plant parts, the use of the model concepts of Trapp and Matthies is proposed, instead of the current relations of Briggs. For organic compounds, the proposal is to introduce the concept of soil and dust particles deposited by rainsplash on the different plant parts.
 

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