Toxicological evaluation and limit values for Methyl-tertiary-butyl ether (MTBE), Formaldehyde, Glutaraldehyde, Furfural 9. Quality criteria, C-value9.1 Quality criteria in soil A limit value of 75 mg/kg soil has been calculated based on toxicological considerations by the oral exposure route. Thus, 75 mg/kg soil is proposed as a quality criterion for formaldehyde in soil. Furthermore, with respect to evaporation from soil, the C-value should be considered. Quality criterion 75 mg/kg soil. 9.2 Quality criteria in drinking water A limit value of 53 mg/l has been calculated based on intake of drinking water. A quality criterion of 50 mg/l is proposed. Quality criterion 50 mg/l. 9.3 C-value A limit value of 0.01 mg/m3 has been calculated for short term exposure and a limit value of 0.001 mg/m3 has been calculated for continuous long term exposure. For formaldehyde a C-value of 0.01 mg/m3 is proposed. Meteorological distribution models have shown that the average exposure level is about 1/40 of the level of the C-value. Therefore a C-value of 0.01 mg/m3 is considered to secure an average exposure level below 0.001 mg/m3, which is the proposed limit value for continuous long term exposure. Thus formaldehyde is placed in Main Group 1 with a C-value of 0.01 mg/m3. C-value 0.01 mg/m3, Main Group 1.
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