Registration Dossier
Registration Dossier
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EC number: 250-437-8 | CAS number: 31024-56-3
Endpoint summary
Administrative data
Description of key information
Additional information
N-[3-(Trimethoxysilyl)propyl]-1-butanamine (CAS No. 31024-56-3) has an estimated water solubility of 1.3E+04 mg/L at 20 °C (QSAR) and a predicted log D (pH 7) of -1.47 (QSAR). Furthermore, it is characterized by a low vapour pressure (4.04 Pa at 25 °C, QSAR), indicating low volatility. Therefore, photodegradation is not an important degradation pathway. Nevertheless, if emitted into the air, it will rapidly photodegrade (estimated half-life for indirect photodegradation: 0.17 d, OH-radicals).
The substance is not readily biodegradable. However, once in the water phase or when exposed to humid environments, the substance is expected to hydrolyse rapidly (DT50 = 4.0 h at pH 7 and 20-25 °C) which contributes significantly to its degradation in the aquatic environment. The resulting transformation products are the silanol hydrolysis product 3-(N-butylamino)propylsilanetriol and the alcohol hydrolysis product methanol (CAS No. 67-56-1).
The ECHA guidance R.16 states that “for substances where hydrolytic DT50 is less than 12 h, environmental effects are likely to be attributed to the hydrolysis product rather than to the parent itself” (ECHA, 2016). The ECHA guidance R.16 also suggests that in cases where the hydrolysis half-life is less than 12 h, the breakdown products, rather than the parent substance, should be evaluated for aquatic toxicity.
Thus, the environmental fate assessment in this dossier is based on the hydrolysis products 3-(N-butylamino)propylsilanetriol and methanol.
Silanol hydrolysis product 3-(N-butylamino)propylsilanetriol
The silanol hydrolysis product 3-(N-butylamino)propylsilanetriol is characterized by a high, estimated water solubility of 1.0E06 mg/L (QSAR). There is no evidence of any significant biodegradation. However, its potential for bioaccumulation and its affinity to soil and sediment is low based on its low log D (-3.91, pH 7, QSAR) and its low, estimated log Koc (1.19, QSAR), respectively. Furthermore, it is characterized by a low vapour pressure (< 0.001 Pa at 25 °C, QSAR), indicating low volatility. Therefore, photodegradation is not an important degradation pathway. Nevertheless, if emitted into the air, it will rapidly photodegrade (estimated half-life for indirect photodegradation: 0.16 d, OH-radicals).
Alcohol hydrolysis product methanol
The alcohol hydrolysis product methanol is well characterized in the public domain. It is fully water miscible at ambient temperatures and is characterized by a low partition coefficient (log Kow = -0.82 to -0.64 (measured)) and a low adsorption coefficient (Koc = 1). Additionally, methanol is considered to have a low overall environmental hazard profile (OECD SIDS, 2004).
Reference:
OECD, 2004: SIDS Initial Assessment Report for Methanol, SIAM 19, Berlin, Germany, 19-22 October 2004, Methanol, CAS 67-56-1
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