Registration Dossier

Environmental fate & pathways

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.