Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

5.4 Transport and distribution

  • Water, soil - air

The Henry's Law constant for n-Butyraldehyde, as predicted by EPIWIN v.3.10 ranges from 1.20 to 1.48 x 10-4atm*m3/mole, indicating that volatilization from water will occur.

A measured Henry's Law constant is reported to be 1.15 x 10-4atm*m3/mole.

Based on the Henry’s law constant (1.2 x 10-4atm*m3/mole), vapor pressure, and water solubility, the estimated volatilization half-life for n-Butyraldehyde from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec) is estimated as approximately 5 to 9 h. The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec) is estimated as approximately 5.3 d. Volatilization half-life from a model environmental pond (2 m deep) can be estimated to be about 4 d.

Volatilization of n-Butyraldehyde from dry soil surfaces is likely to exist, based upon a vapor pressure of 111 mm Hg.

  • Soil - water

Estimated of Koc values of 5, 9 and 71 indicate high to very high soil mobility.

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