Registration Dossier
Registration Dossier
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EC number: 203-529-7 | CAS number: 107-88-0
Endpoint summary
Administrative data
Description of key information
Stability
Hydrolysis as a function of pH
Data waiving in accordance with column 2 of REACH Annex VIII.
Biodegradation
Biodegradation in water
The submission substance is readily biodegradable as demonstrated in OECD TG 301 B.
Biodegradation in surface water, sediment and soil: simulation test
Data waiving in accordance with column 2 of REACH Annexes IX and X.
Identification of degradation products
Data waiving in accordance with column 2 of REACH Annexes IX and X.
Bioaccumulation
Bioaccumulation: aquatic
Data waiving in accordance with column 2 of REACH Annexes IX and X.
Transport and distribution
Adsorption / desorption
Data waiving in accordance with column 2 of REACH Annexes VIII, IX and X.
Additional information
Stability
In air, the photodegradation of 1,3 -butanediol by OH-radicals was estimated to be 14.2329 E-12 cm³/molecule*sec, leading to a half-life of approx. 27 hours (1.1 days) (ECT, 2008).
First order rate constants for photochemical oxidation in water by OH radicals were reported to be 2.2E09 L/mol*sec at pH 7 (Buxton et al., 1988; RL4). No data on phototransformation in soil are available.
Biodegradation in water
The ready biodegradability of 1,3 -butanediol was studied in a Modfied Sturm Test following OECD 301B. The test substance was degraded to 81% (CO2/ThCO2) after 29 days. The 10 -days window was met. The validity criteria were fulfilled. 1,3 -Butanediol is readily biodegradable according to OECD criteria (Barnes, 2000).
Bioaccumulation aquatic/sediment:
Based on a calculated log Pow of -0.29, the BCF was estimated to be 3.2 (log BCF = 0.5) (ECT, 2008). The potential for bioaccumulation in aquatic and benthic organisms is therefore expected to be very low.
Transport and distribution
Adsorption / desorption
Based on a calculated Koc of 1 (PCKoc v1.66), 1,3 -butanediol is expected to have high mobility in soil (ECT, 2008).
Henry's Law constant / Other distribution data
The Henry's Law constant (HLC) was estimated to be 0.0233 Pa*m³/mol at 25 °C. Taking this value, volatilization half-lives of 101 and 1102 days were estimated by EPIWIN v3.20 for a model river and a model lake, respectively (ECT, 2008)
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