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EC number: 203-103-0 | CAS number: 103-34-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable, fulfilling specific criteria
Additional information
- Thompson-Duthie-Sturm Procedure
- Monsanto Shake Flask Procedure
The ultimate biodegradation is the complete conversion of an organic material to carbon dioxide, water, inorganic salts and normal cellular products of bacteria. The rate and extent of C02 production by bacterial action is dependent on many variables. However, the extent of C02 production in a given time under constant conditions can be used as a measure of ultimate biodegradability of a material. Several test procedures have been developed for this purpose. Readily degradable materials such as dextrose'and linear alkylbenzene sulfonate (LAS) typically yield 80-90% and 60-80% of theory, respectively, by these procedures. Since the bacterial systems used in these procedures are relatively weak, a material showing a high degree of conversion to C02during the test interval is not likely to persist in the environment.
Two tests were performed in order to assess the ultimate biodegradation of Sulfatan R (DTDM):
Ultimate biodegradation C02 evolution measurements on the sulfatan R showed a significant C02 evolutions (>25%) that corresponds to a biodegradation 76% after 49 days. For Sulfasan R an unusually long induction or acclimation period of 21 days was found before significant C02 evolution occurred.
As a consequence, Sulfatan R (DTDM) can be considered as inherently biodegradable and will not be persistent in the aquatic environment.
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