Registration Dossier
Registration Dossier
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EC number: 204-427-5 | CAS number: 120-80-9
Endpoint summary
Administrative data
Description of key information
Additional information
Biodegradability in water
Ready biodegradability:
One study (MITI, 1992) was selected as a key study. Although GLP were not mentioned and validity criteria were not available, this study was performed according to the OECD guideline 301C and was generated by the Japanese Competent Authorities. In this study, the biodegradation of Catechol was followed during 14 days, at an initial concentration of 100 mg/L using a mixed, non adapted inoculum (30 mg/L). After 14 days, the measured percentages of biodegradation were 83 % based on O2 consumption and 96 % based on TOC removal. On the basis of this study, Catechol is readily biodegradable.
In an another publication, selected as a supporting study (Gerike, 1979), Catechol was tested in different tests, all in accordance with the OECD guidelines. The results were the followings:
- OECD guideline 301B: 62 % biodegradation after 28 days based on CO2 evolution, 96 % after 42 days based on DOC removal.
- OECD guideline 301C: 88 % biodegradation after 14 days based on DOC removal.
- OECD guideline 301D: 89 % biodegradation after 30 days based on BOD.
- OECD guideline 301E: 91 % biodegradation after 19 days based on DOC removal.
Based on the results obtained in these different studies, Catechol is therefore considered as readily biodegradable.
Inherent biodegradability:
One study in aerobic conditions (Gerike, 1979) was selected as a key study. The study was well described and was performed according to OECD guideline 302B (Zahn-Wellens test). The biodegradability after 4 days was 98% based on DOC removal.
Another study (Pitter, 1976), was performed similarly to the OECD guideline 302B, and was selected as a supporting study. The biodegradability of catechol was 96% after 5 days based on the CO2 evolution.
Therefore, based on these results, Catechol is considered as inherently biodegradable.
Anaerobic biodegradability:
One study (Shelton & Tiedje, 1981) was selected as a key study, because it was well described and was performed according to OECD guideline 311. The anaerobic biodegradability after 28 days was 91 - 98 % based on CH4 evolution.
Two other studies were performed similarly to the OECD guideline 311, and were selected as supporting studies:
- In Shelton & Tiedje (1984), the biodegradability of catechol was > 75 % after 56 days based on the theoretical gas production (CH4 and CO2).
- In Healy & Younge (1978), the biodegradability of catechol was 99 % after 40 days based on the CH4 evolution.
On the basis of these results, Catechol is considered as biodegradable under anaerobic conditions.
Biodegradation in other environmental compartments
Other studies available showed that Catechol is degradable in simulation test in water and sediments (Gerike, 1979), and in soil (Martin, 1979; Stott, 1983)
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