Sodium cumenesulphonate

Endpoint summary

Additional information

Stability

 

Phototransformation in air

  

Using the AOPWIN QSAR model, the photochemical degradation rate of sodium cumenesulphonate in the atmosphere is  3.2636 E-12 cm3/molecule-sec, with a resultant predicted half live of  39.329 Hrs (  0.660 Days (12-hr day; 1.5E6 OH/cm3)).

OVERALL OH Rate Constant =   3.2636 E-12 cm3/molecule-sec

 HALF-LIFE =     3.277 Days (12-hr day; 1.5E6 OH/cm3)

 HALF-LIFE =    39.329 Hrs

 

 

Sodium cumenesulphonate has low vapor pressure (1.09E-009 Pa) indicating significant amounts of sodium cumenesulphonate are unlikely to be present in the atmosphere for photodegradation. The estimated half-life is about 39.329 hours (OH rate = 3.2636 E-12 cm3/ molecule-sec) with the AOPWIN (US EPA, 2011).

 If released to air, a vapor pressure of 8.19E-012 mm Hg at 25 deg C (8.19E-012 mm Hg is equivalent to vapour pressure of 1.09E-0093Pa) indicates significant amounts of Sodium cumenesulphonate are unlikely to be present in the atmosphere for photodegradation and therefore Sodium cumenesulphonate is not expected to be susceptible to direct photolysis by sunlight.

   

 

   

Phototransformation in water

 

Expert Judgement

 If released into water,   Sodium cumenesulphonate is not expected to adsorb to suspended solids and sediment based upon the estimated Koc value of 47.92  L/kg   . Volatilization from water surfaces is not expected to be an important fate process based upon this compound's estimated Henry's Law constant is 3.774E-018 atm-m3/mole  (3.824E-013 Pa-m3/mole)  On this basis phototransformation in water is not expected .  

Therefore testing for Phototransformation in water does not need to be performed.  

 

Phototransformation in soil

If released to soil, Sodium cumenesulphonate is expected to have very high mobility based upon an estimated Koc of 47.92 Volatilization from moist soil surfaces is not expected to be an important fate process. 

Therefore testing for Phototransformation in soils does not need to be performed. 

 

Hydrolysis

 

 No hydrolysable groups are present in the sodium cumenesulphonate. The substance is readily biodegradable

 Biodegradation

 

The substance sodium cumenesulphonate is biodegradable (> 60% THCO2 within 28 days), more than 60% after 6 days.Biodegradation constitutes the primary elimination mechanism from the environment. Studies with sodium cumenesulphonate demonstrate rapid and complete biodegradation under aerobic conditions and sodium cumenesulphonate is considered to be readily biodegradable according to OECD criteria.

There is no known anaerobic biodegradation data on sodium cumenesulphonate. Due to the presence of the sulphonated aromatic group, sodium cumenesulphonate is not expected to biodegrade to a significant extent under anaerobic conditions. However, considering their ready aerobic biodegradability and their low potential for adsorption to sediment solids (log Kow), the presence of sodium cumenesulphonate in anaerobic environments is expected to be negligible.

  

Biodegradation in water:screening tests

 

The substance sodium cumenesulphonate is biodegradable (> 60% THCO2 within 28 days), more than 60% after 6 days.Biodegradation constitutes the primary elimination mechanism from the environment. Studies with sodium cumenesulphonate demonstrate rapid and complete biodegradation under aerobic conditions and sodium cumenesulphonate is considered to be readily biodegradable according to OECD criteria.

There is no known anaerobic biodegradation data on sodium cumenesulphonate. Due to the presence of the sulphonated aromatic group, sodium cumenesulphonate is not expected to biodegrade to a significant extent under anaerobic conditions. However, considering their ready aerobic biodegradability and their low potential for adsorption to sediment solids (log Kow), the presence of sodium cumenesulphonate in anaerobic environments is expected to be negligible.

 

  

Biodegradation in water and sediment: simulation tests

 

The study does not need to be conducted because the substance is ready biodegradable.

The test substance (Dodecylbenzenesulfonate as a read across for Sodium cumenesulphonate) decreased from 76.0 ppm to less than 0.6 ppm at 90h (Readily degradation).The biodegradation of the substance has three periods of rapid adsorption period, acclimation period, and degradation process. 1-Tetralone, 1-indanone, 4-methyl-1-tetralone, naphthalene were the decomposition products. 

 

In the study of Kubodera T, Muto T and Yamamoto T 1978 Dodecylbenzenesulfonate 14C (DBS-14C) was tested as model compound.

Biodegradation of Dodecylbenzenesulfonate 14C(DBS-14C)at76ppmwas measured>90% after90hoursand test temperature was maintained at 24deg C.

DBS decreased from 76.0 ppm to less than 0.6 ppm at 90h (Readily degradation).The biodegradation of DBS-14C has three periods of rapid adsorption period, acclimation period, and degradation process. 1-Tetralone, 1-indanone, 4-methyl-1-tetralone, naphthalene were the decomposition products

 

Biodegradation in soil

 

The study does not need to be conducted because the substance is ready biodegradable.

The test substance (sodium dodecylbenzenesulfonate as a read across for Sodium cumenesulphonate) was readily biodegradable. And the degradation (mineralization) values in anaerobic environment was faster than those in aerobic environment.