Registration Dossier
Registration Dossier
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EC number: 203-931-2 | CAS number: 112-05-0
Endpoint summary
Administrative data
Description of key information
For a short summary on available information on environmental fate and pathways, please see section "Additional information" below.
Additional information
Stability
Nonanoic acid is not expected to hydrolyse in water due to the absence of hydrolysable groups (GUBDH, 2008).
In air, the photodegradation of nonanoic acid by OH-radicals was estimated to be 9.76 E-12 cm³/molecule*sec, leading to a half-life of approx. 39 hours (1.6 days) (ECT, 2009).
No data on phototransformation in water and soil are available (not required for REACH).
Biodegradation
Nonanoic acid is readily biodegradable according to OECD criteria in the modified Sturm test (OECD 301 B: 72 % in 29 d, 10-d window met; Celanese, 1999).
In accordance with column 2 of REACH Annex IX, studies on the biodegradability of the substance in water, sediment and soil do not need to be conducted as the substance is readily biodegradable.
Bioaccumulation
No significant bioaccumulation potential is expected for n-nonanoic acid based on a measured BCF according to the MITI protocol (read-across from source 3,5,5-trimethylhexanoic acid), which corresponds to OECD 305 C (NITE, 2008). The BCF at the lower test concentration (0.1 mg/L) was < 3.1-7.0, while the BCF at the higher test concentration (1 mg/L) was lower (0.5-1.7). This is supported by valid QSAR results corroborating the low experimentally determined BCF as well as a fast metabolism of n-nonanoic acid in fish (biological half-life normalized to 10 g fish at 15 °C: 0.853 days).
Transport and Distribution
The Koc for n-nonanoic acid was estimated by calculation as a function of soil pH using the method of Franco, Fu and Trapp (2009) (OXEA, 2020). Input parameters logPn (Kow for the neutral molecule) and pKa were determined in reliable experimental guideline studies. For environmental exposure and risk assessment, the value of 141 L/kg obtained for Koc at soil pH 6.5 is regarded to be most relevant, because European soils are predominantly of neutral to slightly acidic pH. The low Koc indicates high mobility in soil and low potential for adsorption.
Henry's law constant was calculated from water solubility and vapour pressure to be 0.065 Pa*m³/mol (20 °C). Hence, n-nonanoic acid is expected to have a low potential to volatilise from aqueous solutions.
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