Imidazolium compounds, 2-C17-unsatd.-alkyl-1-(2-C18-unsatd. amidoethyl)-4,5-dihydro-N-methyl, Me sulfates

Biodegradation in water and sediment: simulation tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: sediment simulation testing

Remarks:

Test adresses both, biodegradation in water and sediment

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units)

Deviations:

yes

Remarks:

The aim of the study was to determine the ecotoxicological effects of the effluent of the laboratory scale activated sludge unit for Daphnia magna und algae. Therefore a modified OECD activated sludge unit was used.

GLP compliance:

not specified

Oxygen conditions:

aerobic

Inoculum or test system:

not specified

Duration of test (contact time):

> 63 d

Initial conc.:

10 mg/L

Based on:

test mat.

Parameter followed for biodegradation estimation:

DOC removal

Details on study design:

In a laboratory scale activated sludge unit partially unsaturated IQAC, DMS quaternised was eliminated for >90 %. The test item was diluted in synthetic sewage and dosed in to the test activated sludge unit. In parallel a control laboratory scale activated sludge unit was installed. Composite samples the effluent oft the two sludge units were collected every 24hours and analysed for CSB. The aim of the study was to determine the ecotoxicological effects of the effluent of the laboratory scale activated sludge unit for Daphnia magna und algae. Therefore a modified OECD activated sludge unit was used.

Test performance:

The study conducted is similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units).Partially unsaturated IQAC, DMS quaternised was eliminated for >90 %.

Key result

% Degr.:

> 90

Parameter:

DOC removal

Remarks on result:

other: Daily monitoring oft the sampled effluent of the sludge unit over several weeks (> 9 weeks)

Transformation products:

not measured

In a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. The effluent of the laboratory scale activated sludge unit was used for long-term ecotoxicological tests with Daphnia magna and algae. Therefore the effluent should not contain high ammonium or nitrite concentrations. The degradation capacity of the sludge units was kept high and the nitrification of the sludge unit was therefore > 95%. The ammonium concentration was < 2 mg/L in the effluent.

Validity criteria fulfilled:

not specified

Conclusions:

In a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit.

Executive summary:

In a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. The nitrification of the sludge unit was > 95%. The ammonium concentration was < 2 mg/L in the effluent.

Reference 2

Endpoint:

biodegradation in water: sewage treatment simulation testing

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Transformation products:

no

Reference 3

Endpoint:

biodegradation in water: simulation testing on ultimate degradation in surface water

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Transformation products:

no

Description of key information

Partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. Simulation testing of oleic-acid based IQAC in sediments is not necessary.

Additional information

In a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), closely related substance partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. The nitrification of the sludge unit was > 95%. The ammonium concentration was < 2 mg/L in the effluent.

Therefore simulation testing of oleic-acid based IQAC in sediments is not necessary. In addition the oleic-acid based IQAC hydrolyses rapidly in water at environmental pH (Half lifeat pH7 2.9 days at 20°C, 2.5 days at 25°C, and at pH 9 the half life is 1.2 days at 20 °C) and proved to be inherently biodegradable (> 90% COD elimination after 28 d according to German Guideline DIN 38412, Part 25, corresponding to OECD 302 B)