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Environmental fate & pathways

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Hydrolysis


The hydrolysis of partially unsaturated TEA-EQ as a function of pH was investigated in a study conducted according to OECD Guideline 111 and EU-method C.7. (Preliminary test; main test not conducted due to the pronounced biodegradability of the test substance).


At pH 4 and 50°C, the degradation of the main component of partially unsaturated TEA-EQ was less than 10% over a period of 120 h. The corresponding half-life at 25°C is therefore assumed to be above one year (default assumption acc. to guidelines). In contrast, at pH 7 and 9 and 50°C, more than 10% of the test item were hydrolysed within 120 h. Based on the results half-lives of 17 (pH 7) and 11.3 d (pH 9) were deduced from the reaction rate constants at 25°C. Di- and mono-ester were detected as degradation products


 


Biodegradation


Aerobic biodegradation


One test according to OECD Guideline 301 D (Closed Bottle Test) and four tests according to OECD Guideline 301 B (CO2 Evolution Test) proved the ready biodegradation of partially unsaturated TEA-Esterquat under aerobic conditions.


One study according to ECETOC Anaerobic Biodegradation (Technical Report No. 28) proved the biodegradation of partially unsaturated TEA-Esterquat under anaerobic conditions.


 


Anaerobic biodegradation


The anaerobic biodegradation of partially unsaturated TEA-Esterquat was investigated in a study conducted according to ECETOC Anaerobic Biodegradation (Technical Report No. 28) over a period of 56 days and using anaerobic sludge bacteria from a municipal wastewater treatment plant as inoculum. The biodegradation rate was determined by measurement of dissolved inorganic carbon (DIC). This study is regarded as reliable with restriction and satisfies the guideline requirements for anaerobic biodegradation. The test material attained 76% degradation after 56 days and therefore can be considered as biodegradable under anaerobic conditions.


 


Simulation test


The aerobic biodegradation of partially unsaturated TEA-Esterquat was studied in a test according to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units) and in compliance with the – GLP standards. Activated sludge was collected from the aeration tank of a waste water treatment plant treating predominantly municipal sewage. The test system consisted of 2 laboratory waste water treatment plants (one receiving test material, one did not receive test material (control); the units were not coupled). After periods of stabilizing and adaptation; increasing amounts of partially unsaturated TEA-Esterquat were introduced into the system: 2.5 mg to 20 mg/L DOC. Degradation was followed by DOC measurements in the influent and effluent of the model waste water treatment plant.  Samples were analyzed at day 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 15, 16, 17, 18, and 23.  The test substance was biodegraded by 84.9% on average during 23 d.


 


Bioaccumulation


No experimental data on bioaccumulation is available for the target substance partially unsaturated  TEA-Esterquat. However, data from the structurally related substance DODMAC (Dimethyldioctadecylammonium chloride) is provided. A justification for read-across is given in section “Bioaccumulation: aquatic / sediment”.


For the target substance partially unsaturated TEA-Esterquat a BCF of the same order of magnitude and not higher than DODMAC (13 L/kg) is to be expected.


 


Adsorption / desorption


No data on adsorption/desorption is available for the target substance partially unsaturated  TEA-Esterquat. However, data from the structurally related substance DODMAC (Dimethyldioctadecylammonium chloride) is provided. A justification for read-across is given in section “Adsorption / desorption”.


DODMAC has a chemical structure similar to that of partially unsaturated TEA-Esterquat. The chemical structure of the registration substance includes, in contrast to DODMAC, two polar ester moieties, which will lower adsorption potential. Thus, DODMAC could be considered as a worst case. No calculated Koc is provided for partially unsaturated  TEA-Esterquat, but instead the value obtained with the structurally closely related substance DODMAC (10,000 L/kg dw for both Kp(sed) and Kp(soil)) is used for chemical safety assessment.