Iso-branching of linear alkylbenzene sulfonate (LAS): Biodegradation studies
- EniChem Augusta Industriale Srl, Milano (Italy)
Standard-models, representative of the two main classes of iso-branching present in commercial LAS, have been synthesized and then tested for their biodegradation by screening and continuous activated sludge (CAS) tests in comparison with the linear C{sub 12} LAS homologue. Primary and ultimate biodegradation have been measured applying specific HPLC analysis to the determination of the residual intact material and biodegradation intermediates, the sulpho phenyl carboxylates (SPC). The primary biodegradation of the iso-branching standard-models is total. Their ultimate biodegradation reaches 75--86% in CAS tests respect to a value of 99% for the linear C{sub 12} LAS homologue. A commercial LAS has been also tested in a prolonged batch-biodegradation experiment showing that its iso-branching component mineralizes at rate equivalent to that of the linear component without any accumulation of iso-branching structures.
- OSTI ID:
- 367462
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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