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EC number: 281-897-8
CAS number: 84057-80-7
From the water surface propionic acid will not evaporate into the atmosphere.
The Henrys Law Constant was calculated as 0.07 Pa*m3/mol for the
uncharged molecule. Due to the fact that the test substance is an acid,
the Henry Law Constant has to be recalculated for the environmentally
relevant pH values (5 to 9). This calculation may be performed by using
the correction formula: CORR = 1/(1 + 10^(A*(pH-pKa))
The resulting HLCs were pH 5 = 0.03 Pa*m3/mol, pH 7 = 0 Pa*m3/mol and pH
9 = 0 Pa*m3/mol
Based on these recalculated HLCs propionic acid does not evaporate into
the atmosphere from the water surface.
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