Registration Dossier
Registration Dossier
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EC number: 401-280-0 | CAS number: 91273-04-0 CM 23-376; REOMET 30
Endpoint summary
Administrative data
Description of key information
Parent substance EC 401 -280 -0
Stability
The results of the Hydrolysis study (Ciba, 2009) show that the test item hydrolyses rapidly in water. The study includes two sets of experiments (Investigation by LC/MS and investigation by H-NMR). Both experiments showed that hydrolysis of the test item is very fast. The proposed degradation products are bis(2 -ethylhexyl)amine, 1H-1,2,4 -triazole and formaldehyde (as methanediol).
Biodegradation
The ready biodegradability of the test item was assessed according to OECD guideline 301B. The test revealed that no biodegradation occurred. Additionally the chemical oxygen demand was investigated according to DIN 38 409. A COD of 2.55 g COD/g test substance was calculated.
Bioaccumulation
Due to the results from different QSAR calculations significant bioaccumulation is not expected.
Transport and distribution
No reliable data on substance EC 401 -280 -0 are available. However, as this substance hydrolyses very fast only the degradation products are considered.
Environmental fate data on the degradation products were additionally evaluated. After hydrolysis, the degradation products will consist mainly of bis(2-ethylhexyl)amine (ca 70%), about 20% of the hydrolysate will be 1H-1,2,4-triazole and about 10% formaldehyde (taking into account the individual molecular masses).
Hydrolysis products:
bis(2 -ethylhexyl)amine
Stability
Due to the structural properties of the substance, hydrolysis is not expected under environmental conditions.
Biodegradation
The test substance is regarded to be not readily biodegradable, but moderately biodegradable.
Bioacccumulation
Significant accumulation in organisms is not expected.
Transport and distribution
Adsorption to the solid soil phase is expected.
From the water surface, the substance will slowly evaporate into the atmosphere at pH 9.0 but not at pH 7.0 and lower.
According to the results of the Mackay LEVEL 1 calculation, over time the substance will preferentially distribute into the compartments sediment (50%) and soil (50%). However, since the model does not consider the ionic form of the molecule at environmental relevant pH conditions (5 -9), the model may underestimate distribution into water.
1H-1,2,4 -triazole
Stability
The hydrolysis half-life of 1H-1,2,4 -triazole is > 30days (ECHA disseminated REACH dossier, 2014).
Biodegradation
The substance is not readily biodegradable but significant degradation was observed in a field study in different soils (ECHA disseminated REACH dossier, 2014).
Bioaccumulation
Due to the results of QSAR calculations, significant accumulation in organisms is not expected. The log Pow of -0.58 (Hansch et al 1995) indicates a low bioaccumulation potential.
Transport and distribution
Mobility in soil is expected. No data on Henry's Law constant and distribution modelling are available.
Formaldehyde
Stability
Hydrolysis is not expected due to the chemical structure.
Biodegradation
Formaldehyde is expected to be readily biodegradable at low concentrations (Gerike 1990).
Bioaccumulation
In tests on different fish species and a shrimp, no bioaccumulation was observed. The log Pow of 0.35 (Hansch et al 1995) indicates a low bioaccumulation potential.
Transport and distribution
Moderate to high mobility in soil is expected. From the water phase the substance will not evaporate into the atmosphere. Using simple environmental models based on fugacity, the main target for environmental distribution will be water.
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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