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 4 mg/kg has been calculated based on children’s ingestion of soil. A quality criterion of 4 mg/kg soil is proposed. Quality criteria Quality criterion: 4 mg/kg soil. 9.2 Quality criteria in drinking water A limit value of 2.8 mg/l has been calculated based on intake of drinking water. A quality criterion of 3 mg/l is proposed. Quality criteria Quality criterion: 3 µg/l. 9.3 C-value A limit value of 0.002 mg/m3 has been calculated. For substances having acute or subchronic effects, but for which activity over a certain period of time is necessary before the harmful effect occurs, the C-value is set at the limit value (MST 1990). Furfural has a low odour threshold (0.31 mg/m3) in air. However, the health based limit value will take into account the discomfort from the odour. Furfural is adopted in Main Group 2, class I for organic substances, but without an exact C-value (MST 1990). A C-value of 0.002 mg/m3 is proposed. Furfural is moved to Main Group 1 because the possibility of genotoxic or carcinogenic effects of furfural cannot fully be excluded. C-value 0.002 mg/m3, Main Group 1.
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