Registration Dossier
Registration Dossier
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EC number: 480-340-8 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Hydrolytically stable at pH 4, 7, 9.
Readily biodegradable.
Non-bioaccumulative.
Additional information
The substance was assessed for its biotic and abiotic degradation by evaluating its ready biodegradability and hydrolysis potential.
The substance was assessed for its rate of hydrolysis in different pH (4, 7, 9). Since the substance dissociates in water to sodium perchlorate and triethanolamine, the hydrolysis rate was evaluated by measuring the concentration of triethanolamine over the test duration. After 5 days the substance was found to be stable at pH 3.9, 7 and 9 as triethanolamine concentration showed an increase instead of a decrease; 1037.50 %, 5.32 % and 1.90 % at pH 4, 7 and 9 respectively. Even after 10 days triethanolamine concentration increased by 1425 % at pH 4.5 and by 8.22 % at pH 9. Only at pH 7 showed a small decrease of 0.22 %. Since the hydrolysis rate was less than 10 % after 5 days, no further testing was necessary and the dissociation substances are considered to be abiotically stable.
The substance was found to be readily biodegradable in a ready biodegradability test; 100.3 % was biodegradable after only 19 days. This value is much higher than the pass level of 70 % DOC removal requested by the OECD Guideline 301 A.
The substance is not expected to degrade abiotically but it is expected to biodegrade readily, suggesting that it will not be found in the aquatic environment for a long period. Furthermore, the substance is very soluble in water and has a log Pow lower than 4, which could potentially indicate that the substance does not bioaccumulate. The low probability of the substance for bioaccumulation is supported by the bioconcentration factors of the dissociation substances (perchlorate and triethanolamine). BCF of perchlorate determined in a bioconcentration test is BCF=0.70 l/kg; triethanolamine is also not expected to bioaccumulate being very water soluble and having a logKow >4 (estimated value 3.162 l/kg wet-wt).
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