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Re-evaluation of some human-toxicological Maximum Permissible Risk levels earlier evaluated in the period 1991-2001

Herevaluatie van enkele humaan-toxicologische Maximum Toelaatbare Risicogrenzen eerder geevalueerd in de periode 1991 - 2001

Synopsis

In 2007 and 2008 RIVM re-evaluated the health-based limit values for humans of ten substances and substance classes (human-toxicological Maximum Permissible Risk levels). It concerns three metals and five organic compounds, and also chloride and sulfate. Six substances/substance classes were earlier evaluated in the period 1991 - 2001; chloride, sulfate, ethyl-t-butylether and methyl-t-butylether are evaluated for the first time. Some of the new limit values are lower than the former values, but others are higher or remain unchanged. The re-evaluation was justified by new scientific data. Together with the ecotoxicological limit values the human health-based limit values are the basis for soil intervention values. These soil intervention values are used to determine whether contaminated soils meet the criteria for 'serious soil contamination' as stated in the Dutch Soil Protection Act. For each re-evaluated compound or compound class a toxicity profile has been compiled. From each of these profiles an updated Maximum Permissible Risk is deduced for oral exposure, and if relevant also for inhalation exposure.
 

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