Registration Dossier

Environmental fate & pathways

Henry's Law constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

No significant volatilization from aqueous solution of sodium perborate as well as its hydrolysis products is to be expected.

Key value for chemical safety assessment

Additional information

Studies on the environmental distribution behaviour of sodium perborate are not available. From the physico-chemical properties and the use pattern of sodium perborate it is obvious that the by far most important target compartment for the anthropogenic releases is the hydrosphere. From the ionic structure of the substances a significant volatilization from water is not to be expected. Due to the intended decomposition during use and the degradation in the aquatic environment an assessment of the adsorption behaviour should be derived from the data on the degradation products.

For hydrogen peroxide, several experimentally determined values for the Henry´s Law constant are available (ECB 2003). The value of H = 7.5.10-4 Pa.m3/mol (logH = -3.13) at 20°C was chosen to be used in the assessment. This value indicates, that volatilisation of hydrogen peroxide from water is very low.

For boric acid, the Henry´s Law constant was considered to be negligible (vapour pressure 9.9 x 10-6 Pa at 25°C) (ECB 2009).