Registration Dossier
Registration Dossier
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EC number: 203-532-3 | CAS number: 107-92-6
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
Phototransformation in air
For the indirect photodegradation of butyric acid in air by the reaction with OH-radicals, a half-life of approx. 188 hours (7.8 days) was calculated (ECT, 2009).
Hydrolysis
Due to its chemical structure and reactivity, butyric acid will not hydrolyze under environmental conditions. The structure of the molecule does not contain hydrolizable constituents (GUBDH, 2008).
Biodegradation
Biodegradation in water: screening test
Butyric acid has been demonstrated to be readily biodegradable in a valid biodegradation test according to OECD TG 301 E (Hüls, 1996).
Biodegradation in water and sediment: simulation test
In accordance with column 2 of REACH Annex IX Nr. 9.2, the study does not need to be conducted as the substance is readily biodegradable.
Biodegradtation in soil
In accordance with column 2 of REACH Annex IX Nr. 9.2, the study does not need to be conducted as the substance is readily biodegradable.
Bioaccumulation
Bioaccumulation: aquatic/sediment
In accordance with column 2 of Annex IX, the study does not need to be conducted if the substance has a low potential for bioaccumulation. The log Kow of 1.1 for butyric acid (OXEA, 2009) indicates a low potential for bioaccumulation. In addition the substance is readily biodegradable (Hüls, 1996). Therefore and for reasons of animal welfare a fish study is not performed.
Based on an experimental log Kow of 1.1, the log BCF of butyric acid was estimated to be 0.5 (BCF = 3.162). In addition, a log BAF (upper trophic) of 0.31 (BAF = 2.06) was calculated using the method of Arnot-Gobas (ECT, 2010). The low BCF/BAF values indicate a low potential of butyric acid for bioaccumulation in aquatic and benthic organisms.
Transport and Distribution
Adsorption/Desorption
In accordance with column 2 of REACH Annex IX Nr. 9.3.3, the study does not need to be conducted as the substance has a low potential for absorption (log Kow < 3) and is readily biodegradable.
As additional information, the Koc of butyric acid was estimated to be 45.5 at pH 7 (log Koc = 1.66) (OXEA, 2010) indicating high mobility in soil.
Henry’s Law constant
For butyric acid, a Henry's law constant of 2.20E-7 atm m³/mol was determined in a experimental study using equilibrium partial pressure measurements over aqueous solutions at 298.15 K (25°C) (Khan, 1992).
Calculations (ECT, 2009) (US EPA EPI Suite v4.00) resulted in
Group contribution method: HCL (25°C) = 5.87E-007 atm*m3/mol
Bond contribution method: HCL (25°C) = 9.65E-007 atm*m3/mol
Butyric acid volatilizes only to a low degree from water.
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