Valeraldehyde

110-62-3

The Henry's Law constant for valeraldehyde is 1.47X10-4
atm-m3/mole. 
Using thia value for the Henry's Law constant one 
can estimate that the volitilization half-lifem of
valeraldehyde from a 1 m deep model river flowing at 1 m/s wind
is 8.3 hours. 
Similarly the volatilizationion half-life of
valeraldehyde from a model lake 1 m deep with 0.05 m/s current
and a 0.5 m/s wind is estimated to be 5.4 days. 
Its high
Henry's Law constant and low adsorptivity to soil indicates 
that it should readly volatilize from moist soil. 

Valeraldehyde has a high vapor pressure 26 mmHg at 20 °C
and therefore readily volatilize from dry soil and other
surfaces (HSDB 2001).

Using the water solubility for valeraldehyde 13.5 mg/l, the  
estimated Koc value is 1040. 
This Koc value indicates that 
valeraldehyde would have low mobility in soil (HSDB 2001).

In the atmosphere valeraldehyde reacts with 
photochemically-produced hydroxyl radicals with a rate constant 
of 2.85X10-11 cm3/molecules-sec. 
Assuming a hydroxyl radical 
conc. of 5X10+5 radicals/cm3, the half-life of valeraldehyde in 
the atmosphere would be 13.5 hours (HSDB 2001).

Aldehydes absorb UV radiation >290 nm, and investigations with 
formaldehyde and acetaldehyde indicate that direct photolysis 
together with reaction with hydroxyl radicals are the major 
sinks for valeraldehyde in the lower atmosphere (HSDB 2001).

Aldehydes, especially straight chain ones, are readily oxidized
in biodegradability tests. 
The oxygen uptake in a
biodegradability test using sludge from different wastewater
treatment plants was 12.7, 16.5 and 17.8 percent of theoretical
oxygen demand after 6, 12 and 24 hr, reapectively. 
These result
are supported by the fact that the analogous chemical,
butyraldehyde, was readily biodegradable in the laboratory
tests (HSDB 2001).

While no information was located concerning the anaerobic
biodegradability of valeraldehyde, the analogous chemical,
butyraldehyde, was readily biodegradable under anaerobic
conditions and it is therefore likely that vateraldehyde would 
show similar behavior (HSDB 2001).

Using the estimated log Kow and recommended regression 
equation, the estimated BCF value is 5.8. 
Therefore 
valeraldehyde would not be expected to bioconcentrate in 
aquatic organisms (HSDB 2001).