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EC number: 203-529-7
CAS number: 107-88-0
Hydrolysis as a function of pH
Data waiving in accordance with column 2 of REACH Annex VIII.
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
Transport and distribution
Adsorption / desorption
Data waiving in accordance with column 2 of REACH Annexes VIII, IX and X.
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.
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).
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.
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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