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PBT assessment

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PBT assessment: overall result

Reference
Name:
calcium dodecylbenzenesulphonate
Type of composition:
boundary composition of the substance
State / form:
solid: particulate/powder
>= 86 - <= 92 % (w/w)
Reference substance:
calcium dodecylbenzenesulphonate
Reference substance:
calcium dodecylbenzenesulphonate
This impurity is considered relevant for the classification and labelling of the substance
Reference substance:
calcium dodecylbenzenesulphonate
This impurity is considered relevant for the classification and labelling of the substance
Reference substance:
calcium dodecylbenzenesulphonate
This impurity is considered relevant for the classification and labelling of the substance
Reference substance:
calcium dodecylbenzenesulphonate
This impurity is considered relevant for the classification and labelling of the substance
Reference substance:
calcium dodecylbenzenesulphonate
This impurity is considered relevant for the classification and labelling of the substance
PBT status:
the substance is not PBT / vPvB
Justification:

Annex XIII of the REACH Regulation (1907/2006) lays down the criteria for the identification of persistent, bioaccumulative and toxic substances (PBT substances), as well as the information that must be considered for the purpose of assessing the P, B, and T properties of the substance. The criteria require that all available information is to be used, employing a weight-of-evidence approach. Substances must meet all three criteria to be considered PBT.

This substance (Calcium dodecylbenzenesulphonate/Benzenesulfonic acid, dodecyl-, calcium salt(CAS#26264-06-2)) is from the group of linear and branched alkylbenzene sulfonates (LAS/ABS). 

 

 

Persistence Assessment:

 

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

Biodegradation at 10 ppm was measured 75% after 11 days and test temperature was maintained at 20 deg C for 17 days. The substance could be concluded as readily biodegradable within 28 days.

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

 

Ward and Larson (1989) conducted a laboratory study and observed the biodegradation rate constant and half-life for C12-LAS in sludge-amended soil. The biodegradation rate constant for C12-LAS is 0.030 day-1and half-life for C12-LAS is 23.1 days. Scheunertet al., (1987) measured the biomineralization rate of dodecylbenzenesulfonate in soil/water suspension under anaerobic and aerobic conditions for 42 days. The results (40.6%14CO2: aerobic, 51.9%14CO2: anaerobic) showed that the substance was readily biodegradable by the micro-organisms present in soil.

 

Summary of Biodegradation

 

Type/ Method

Test material

Degradation

Duration

References

Aerobic/

OECD 301F

C12-LAS

> 60 % of mineralisation

28 days

Temmink and Klapwijk, 2004

Aerobic/

Other

Sodium dodecylbenzenesulfonate

75 %

11 days

Cook and Glodman, 1974

Aerobic/

OECD 301B

Dodecylbenzenesulfonic acid

69 % of mineralisation

28 days

USEPA 1992

Aerobic/

Other

C12-LAS

50%

23.1 days

Ward and Larson, 1989

Aerobic and Anaerobic/

Other

Dodecylbenzenesulfonate

40.6%14CO2of mineralization

(aerobic),

51.9%14CO2of mineralization (anaerobic)

42 days

Scheunertet al., 1987

 

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.

     

Therefore,Calcium dodecylbenzenesulfonate is not persistent.

 

Bioaccumulation Assessment:

 

An estimated BCF is 70.79 by BCFWIN Model based on log Kow =4.78 (US EPA, 2011). Bioconcentrations of total C12-LAS in fathead minnows (Pimephales promelas), channel catfish (Ictalurus punctatus), andamphipod (Hyalella azteca) were investigated during 32 days. At 32 days, total C12-LAS bioconcentration factors (BCFs) for the three species ranged from 36 to 119 (Versteeg and Rawlings, 2003).

These experimental and estimated BCF values suggest that Calcium dodecylbenzenesulphonate  has a low potential for bioaccumulation.

Therefore,Calcium dodecylbenzenesulfonate is not bioaccumulative.

 

 

Toxicity Assessment:

None of the long-term NOECs for marine or freshwater organisms are 0.01 mg /L. Calcium dodecylbenzenesulphonateis not classified as carcinogenic (Category 1 or 2), mutagenic (Category 1 or 2), or toxic for reproduction (Category 1, 2 or 3). There is no evidence of chronic toxicity, as identified by the classifications: T, R48, or Xn, R48 according to Directive 67/548/EEC. Therefore Calcium dodecylbenzenesulphonatedoes not meet the PBT criteria for toxicity.

 

Summary and overall Conclusions on PBT or vPvB:

Properties Based on the data collected and the discussion above, of Calcium dodecylbenzenesulphonate does not meet the criteria for either PBT or VPvB as it is readily biodegraded in the environment, has a very low bioaccumulation potential, low chronic aquatic toxicity and is not classified as carcinogenic, mutagenic, or toxic for reproduction or for chronic toxicity.

 

 

 

 

 

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