Registration Dossier
Registration Dossier
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EC number: 204-617-8 | CAS number: 123-31-9
Endpoint summary
Administrative data
Description of key information
Additional information
Adsorption and distribution
The estimated Koc values were in the range of 9 to 50. These values indicate a very low to low sorption to organic matter in soil and sediment (according the scheme of Litz 1990). Therefore hydroquinone is expected to show high to very high mobility in soil and sediment (without taking into account potential ion-ion interactions).
Henry's Law constant
In the EPA database EPI Suite Version 4.00 (HENRYWIN v3.10 Results, Data available in EPIWIN: Experimental Database Structure Match) an experimental value for the Henry Law Constant at 25°C of 4.73E-11 atm-m³/mole is given, equivalent to 4.7927 E-06 Pa-m³/mol.
Distribution modelling
Due to its physicochemical properties (e.g. water solubility, vapor pressure), hydroquinone is expected to be found predominantly in the aquatic compartment.
Environmental data
There are no monitoring dara and data on field studies available.
Additional information on environmental fate and behaviour
Hydroquinone was shown to be rapidly oxidized in aqueous solution. The reaction rate is dependent on pH. The DT50 increased from 111 days at pH 7 to 0.84 at ph 9.
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