Registration Dossier
Registration Dossier
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EC number: 228-055-8 | CAS number: 6104-30-9
Biodegradation in soil
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in soil: simulation testing
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance is readily biodegradable
Reference
Description of key information
Substance is readily biodegradable (according to OECD criteria), therefore no further biodegradation testing required under REACh
Key value for chemical safety assessment
Additional information
Substance is readily biodegradable (according to OECD criteria), therefore no further biodegradation testing required under REACh. The biodegradbility of IBDU in soil, however, was studied in several tests (e.g. Hughes 1976, Markova 1978).
Through its use as slow-release fertilizer, IBDU granules are directly applied on soil. With soil moisture, IBDU may be hydrolized to urea and isobutyraldehyde, dependent on pH, granular size and temperature (Hamamoto, 1966). Both substances are at least inherently biodegradable. Urea is decomposed by urease into NH3 and CO2 (ammonification) and NH3 then protonated into the ammonium ion. The latter volatilizes or is oxidized via nitrite into nitrate (nitrification). Low pH (pH < 6), high temperatures, high soil moisture and small granular size increase solubilisation of IBDU and, hence, mineralization (Hamamoto, 1966; Hughes, 1976; Markova, 1978). Within 24 weeks, the total amount of mineralized nitrogen in 4 different soil types with pH values of 4.8 to 8.3 was between 88 and 99 % of the introduced IBDU (Markova, 1978).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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