Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs., compds. with isopropanolamine

Biodegradation in water: screening tests

Description of key information

The biodegradability of benzenesulfonic acid, 4-C10-13-sec-alkyl derivs.-, compd. with isopropanolamine (1:1) (LASMIPA)was studied in a OECD 301 B (CO2 -evolution) test. More than 70% degradation was observed after 28 days.

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

The biodegradability of benzenesulfonic acid, 4-C10-13-sec-alkyl derivs.-, compd. with isopropanolamine (1:1) (LASMIPA)was studied in a OECD 301 B (CO2 -evolution) test. The test substance, MARLON AMI 80 consisted of 78%LASMIPA in 22% 1,2-propylene glycol.Tests were performed with 10 mg organic carbon/L, equivalent to 17.6mg/L MARLON AMI 80, added to flasks containing activated sludge. The CO2 production was then measured as inorganic carbon captured in gas wash flasks filled with 0.05 M NaOH over the next 28 days.

Sodium benzoate was used as a reference substance and as toxic control both the test substance and the reference substance were combined. Sodium benzoate attained 76% degradation after 14 days and 105% degradation after 28 days thereby confirming the suitability of the inoculum and test conditions. The toxicity control attained 69% degradation after 14 days and 81% degradation after 28 days thereby confirming that the test item was not toxic to the sewage treatment micro-organisms used in the test. As CO₂ produced by degradation of LASMIPA cannot be distinguished from that formed by degradation of 1,2-propylene glycol, the degradation of LASMIPA was calculated for three scenario's: 100% degradation, equal to LASMIPA or 0% degradation of 1,2 propyleneglycol, giving degradation rates for LASMIPA of 70%, 75% and 92%, respectively. The 10-day window validation criterion does not apply for UVCB substances. The test substance, LASMIPA, is readily biodegradable.