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      Exposure scenarios and guidance values for urban soil pollutants.

      Regulatory toxicology and pharmacology : RTP

      Urban Health, Adult, Sports, analysis, adverse effects, Soil Pollutants, Risk Management, Risk Assessment, Recreation, Practice Guidelines as Topic, Lead, Inhalation Exposure, Humans, Environmental Exposure, Crops, Agricultural, Child Day Care Centers, Child, Benzo(a)pyrene

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          In general, risk assessments of urban soil pollution are prepared by comparing the levels of pollutants with soil quality criteria. However, large urban areas are contaminated with concentrations of pollutants far exceeding the existing soil quality criteria and would consequently be considered to be of potential risk to humans. This is, however, a rather rigid approach, and for risk management purposes it would be desirable to have more than just one level of soil quality criteria. Therefore, a generic risk assessment model was developed for five different use scenarios: child-care centers, kitchen gardens, ornamental gardens, parks, and sports grounds. In each of the scenarios, three different types of expected behavior are described for children and adults, respectively, resulting in different levels of exposure to the pollutants. For risk management purposes, various guidance values can then be derived for each use scenario. Below a lower guidance value, a free use of the area according to the defined use is possible without an unacceptable risk to the public. Above an upper value, a cutoff of the exposure is necessary. In between, the use may be regulated by different types of advice. The model is still preliminary but was, however, used for derivation of guidance values for five commonly found soil pollutants, of which the results for benzo[a]pyrene and lead are presented. Copyright 1999 Academic Press.

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