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Environmental fate & pathways

Biodegradation in water: screening tests

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biodegradation in water: ready biodegradability
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Justification for type of information:
A category group was formed with dipotassium peroxodisulphate (KPS), disodium peroxodisulphate (SPS) and diammonium peroxodisulphate (APS). Several physico-chemical, fate, ecotoxicological and toxicological endpoints were assessed using the category approach. Please refer to the read across justification in chapter 13 for further information.
Reason / purpose for cross-reference:
read-across source
Key result
other: chemical oxygen demand (COD)
Remarks on result:
other: The chemical oxygen demand (COD) of the test substance was determined to be negligible (26E-03 g COD per g test substance).
Key result
0.03 other: g COD/g test. mat.

Description of key information

The chemical oxygen demand was not tested for dipotassium persulfate. A read across approach was applied for the test on oxygen demand with the category member diammonium persulfate, as this substance shows similar environmental fate properties. Diammonium persulfate was tested for Chemical Oxygen Demand in according to EU Guideline C.6. The chemical oxygen demand (COD) of a sample was determined to be negligible (26E-3 g COD per g test substance).

Key value for chemical safety assessment

Additional information

In a triplicate experiment, the chemical oxygen demand was determined to be negligible (26E-03 g COD/g diammonium persulfate) (individual values: 26E-03, 26 E-03 and 25 E-03 g COD/g diammonium persulfate, respectively). Upon contact with water or water vapour substances of the Persulfate Category hydrolyse into cation and persulfate anion. Hydrolysis is temperature and pH dependent and decomposition rates increase with decreasing pH value and increasing temperature. The persulfate anion, independent of the cation, undergoes further decomposition in normal water or acid conditions, readily oxidizing water to oxygen, producing sulphate and hydrogen ions. All persulfate decomposition products are ubiquitous to the environment. Hydrolysis is metal catalyzed, and rapid reaction with organic matter also is possible.