Benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt, basic

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

Nov. 18, 2002-Dec. 19, 2002

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)

GLP compliance:

yes (incl. QA statement)

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, non-adapted

Details on inoculum:

- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Marl-Ost municipal sewage treatment plant
- Initial cell/biomass concentration: 3.94 g/l dry matter

Duration of test (contact time):

29 d

Initial conc.:

34.3 mg/L

Based on:

test mat.

Parameter followed for biodegradation estimation:

CO2 evolution

Details on study design:

TEST CONDITIONS
- Test temperature: 19.7-21.9 degree C
- pH: 7.4-7.5
- Aeration of dilution water: yes, overnight
- Suspended solids concentration: 26.3 mg/L

TEST SYSTEM
- Culturing apparatus: 5000 ml Woullf flasks
- Number of culture flasks/concentration: 2 flasks

SAMPLING
- Sampling frequency: 0, 2, 5, 9, 12, 14, 21, 28, and 29 days

CONTROL AND BLANK SYSTEM
- Inoculum blank: 2 flasks

STATISTICAL METHODS: Results were calculated using the EXCEL computer program.

Reference substance:

benzoic acid, sodium salt

Key result

Parameter:

% degradation (CO2 evolution)

Value:

85

Sampling time:

29 d

Details on results:

The test substance was 85% degraded on day 29.

Results with reference substance:

The reference substance was 89% degraded in 29 days.

% Degradation

Test Duration (days)	Sodium Benzoate	Test Vessel 1	Test Vessel 2	Test Vessel Mean
0	0	0	-1	-1
2	32	1	-5	-2
5	59	24	19	22
9	76	57	46	52
12	84	73	66	70
14	84	72	67	70
21	93	76	79	78
28	95	86	80	83
29	89	84	85	85

Validity criteria fulfilled:

yes

Interpretation of results:

readily biodegradable

Conclusions:

The test substance was 85% degraded in 29 days, and is considered readily biodegradable.

Executive summary:

This study examined the biodegradability of the test substance. 34.3 mg/L of test substance was added to flasks containing activated sludge. The amount of CO2 evolved was then measured over the next 29 days. Sodium benzoate was used as a reference substance. The reference substance was 89% degraded in 29 days. Therefore the test is valid. The test substance was 85% degraded in 29 days. The test substance is readily biodegradable.

Reference 2

Endpoint:

biodegradation in water: ready biodegradability

Data waiving:

other justification

Justification for data waiving:

other:

Description of key information

Benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt consists of cerium cations and benzenesulfonic acid (4-C10-13-sec-alkyl derivate) anions. Based on the solubility of Benzenesulfonic acid, 4-dodecyl-, cerium(4+) salt in water, a complete dissociation resulting in cerium and benzenesulfonic acid (4-C10-13-sec-alkyl) ions may be assumed under environmental conditions.

The concept of biodegradation is not applicable to inorganic elements, including cerium. However, sodium 4-undecylbenzenesulfonate (CAS 68411-30-3), a structural analogue of benzenesulfonic acid (4-C10-13-sec-alkyl derivate) is readily biodegradable based on a standard OECD 301B test (83% degradation in 28 days meeting the 10-d window).