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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The half life period of 4-chlororesorcinol in water is observed to be 15 days (360 hrs.) while in sediment it is 135 days (3240 hrs). Based on these half life values of 4-chlororesorcinol, it is concluded that the chemical is not persistent in water where as it is persistent in sediment. However, since there is negligible diffusion of the substance in the sediment as evident from the reported data (0.275 % in sediment) and hence persistence in the sediment compartment is not likely to becritical.

Key value for chemical safety assessment

Half-life in freshwater:
15 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
135 d
at the temperature of:
25 °C

Additional information

Based on the Level III Fugacity Model, the half-life period of the 4-chlororesorcinol was estimated. The half life period of 4-chlororesorcinol in water is observed to be 15 days (360 hrs.) while in sediment it is 135 days (3240 hrs). Based on these half life values of 4-chlororesorcinol, it is concluded that the chemical is not persistent in water where as it is persistent in sediment. However, since there is negligible diffusion of the substance in the sediment as evident from the reported data (0.275 % in sediment) and hence persistence in the sediment compartment is not likely to be critical.