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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation in water of the substance is derived using read across. Only one of both read across substances is readily biodegradable but both are inherently biodegradable. Therefore, inherently biodegradable is used key value.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

In a read across approach studies with both constituent were used to describe biodegradation in water (ready and inherent degradation) of the substance. The more critical value is used as key value.

Hypothesis for the read-across approach:

Group: Reaction mass of Glycerol, propoxylated and Sucrose, propoxylated;Succhrose, propoxylated; Propylidynetrimethanol, propoxylated; Glycerol, propoxylated; DGlucitol, propoxylated; Propane-1,2-diol, propoxylated; Pentaerythritol, propoxylated; 2,2',2''Nitrilotriethanol, propoxylated; Trimethylolpropane, ethoxylated; Diethylene glycol, propoxylated; Ethylene glycol, propoxylated; Diethanolamine, propoxylated.

The substance is member of a group of chemicals with similar chemical structure and physical behaviour:

1.) Chemical similarity: All of these substances have terminal OH-groups and ether-linkages as common structural features. Thus, the substances differ from each other only in the identity/type of starter molecule (aliphatic alcohols with 2 to 8 hydroxy functions) used and its associated bonding with the alkoxylate repeating units. Typically the products are substances with a range of Ethyleneoxide or Propyleneoxide units (1 -12.5) added to starter molecules. All substances are characterised by a molecular weight distribution of ca. 150 - 1000. The common function of the members of the group is to allocate a high number of hydroxy functions which are intended to react with e.g. an isocyanate.

2.) Physical behaviour: All members of the group are liquids with elevated viscosity, high solubility in water (> 100 g/L) and a low vapour pressure (<0.0003 hPa).