Calcium dodecylbenzenesulphonate

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

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

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

Sodium dodecylbenzenesulfonate (CAS# 25155-30-0 , EC Number; 246-680-4 ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2, EC Number; 247-557-8) ) and read-across is valid.

Reason / purpose for cross-reference:

read-across source

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)

GLP compliance:

not specified

Oxygen conditions:

aerobic

Inoculum or test system:

natural water

Details on inoculum:

To each liter of sterile Bay water was added 1.0 mL of sterile BOD buffer and 5 mL of a “seed” culture. The bacterial “seed” consisted of the sample of (non-filtered) Bay water from May 30, 1972 which was supplemented with DBS (10 ppm) and incubated at 20 deg C for 17 days, by which time more than 75% degradation had occurred.

Duration of test (contact time):

17 d

Initial conc.:

10 other: ppm

Based on:

test mat.

Details on study design:

Detergent decomposition depends on aerobic respiratory processes, incubation in a closed vessel results in depletion of dissolved oxygen. To determine oxygen utilization during detergent oxidation a BOD-type test was employed with sodium dodecylbenzene sulfonate as substrate. Bay water aged more than 30 days was sterilized by membrane filtration (Millipore, 0.45 um).

Parameter:

% degradation (test mat. analysis)

Value:

> 75

Sampling time:

11 d

Validity criteria fulfilled:

yes

Interpretation of results:

readily biodegradable

Conclusions:

Biodegradation of DBS, at 10 ppm was measured 75% after 11 days and test temperature was maintained at 20 deg C for 17 days. The sodium dodecylbenzene sulfonate (DBS) could be conclued as readily degradable.Sodium dodecylbenzenesulfonate (CAS# 25155-30-0 , EC Number; 246-680-4 ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2, EC Number; 247-557-8) ) and read-across is valid.

Description of key information

Biodegradation in water:screening tests
 
Data of following studies are demonstrating rapid biodegradation of C12-LAS under aerobic conditions. Temmink and Klapwijk (2004) conducted OECD 301F test and the result is that more than 60% of mineralisation was achieved within 28 days.
Cook and Glodman, 1974 conducted Biodegradation of dodecylbenzene sulfonate (DBS), at 10 ppm was measured 75% after 11 days and test temperature was maintained at 20 deg C for 17 days. The  dodecylbenzene sulfonate (DBS) could be conclued as readily degradable.
For dodecylbenzene sulfonic acid, the available study indicates 69% of the material mineralized after 28 days ,OECD 301B test (USEPA 1992).
Dodecylbenzene sulfonic acids (CAS# 27176-87-0 , EC Number; 248-289-4) ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2,  EC Number;247-557-8) ) and the dissociated acid it readily dissociates in water and release the dodecylbenzene sulfonic anion in solution.
Sodium dodecylbenzenesulfonate (CAS# 25155-30-0 , EC Number; 246-680-4 ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2,  EC Number; 247-557-8) ) and  read-across is valid.

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

Biodegradation in water:screening tests

 

Data of following studies are demonstrating rapid biodegradation of C12-LAS under aerobic conditions. Temmink and Klapwijk (2004) conducted OECD 301F test and the result is that more than 60% of mineralisation was achieved within 28 days.

Cook and Glodman, 1974 conducted Biodegradation of sodium dodecylbenzene sulfonate (DBS), at 10 ppm was measured 75% after 11 days and test temperature was maintained at 20 deg C for 17 days. The dodecylbenzene sulfonate (DBS) could be conclued as readily degradable.

For dodecylbenzene sulfonic acid, the available study indicates 69% of the material mineralized after 28 days ,OECD 301B test (USEPA 1992).

Dodecylbenzene sulfonic acids (CAS# 27176-87-0 , EC Number; 248-289-4) ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2, EC Number;247-557-8) ) and the dissociated acid it readily dissociates in water and release the dodecylbenzene sulfonic anion in solution.

 

Sodium dodecylbenzenesulfonate (CAS# 25155-30-0 , EC Number; 246-680-4 ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2, EC Number; 247-557-8) ) and read-across is valid.

Table     Summary of Biodegradation in water:screening tests

 

Type/ Method	Test material	Degradation	Duration	References
Aerobic/ OECD 301F	C12-LAS	> 60 % of mineralisation	28 days	Temmink and Klapwijk, 2004
Aerobic/ Other	Sodium dodecyl benzenesulfonate	75 %	11 days	Cook and Glodman, 1974
Aerobic/ OECD 301B	Dodecylbenzenesulfonic acid	69 % of mineralisation	28 days	USEPA 1992