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Ecotoxicological information

Toxicity to microorganisms

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Reference
Endpoint:
activated sludge respiration inhibition testing
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Justification for type of information:
READ ACROSS CATEGORY APPROACH
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:
read-across source
Key result
Duration:
18 h
Dose descriptor:
EC10
Effect conc.:
36 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: multiplication of bacterial cells

Description of key information

No studies on toxicity to microorganisms with dipotassium persulfate were available. A read across approach was applied to studies with diammonium persulfate, as the substance shows similar ecotoxicological properties. The toxicity of microorganisms to diammonium persulfate was tested in a study according to guidelines NEN 6509 and NPR 6508. The study revealed an EC10 (18 h) of 36 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
36 mg/L

Additional information

No study on toxicity to microorganisms with dipotassium persulfate was available. Instead a read across approach was applied to assess the toxicity to microorganisms using data available for diammonium persulfate, a substance considered to exhibit comparable ecotoxicological properties. In the key study the toxicity of diammonium persulfate to the gram negative bacterium Pseudomonas putida was determined in a growth inhibition test according to guidelines NEN 6509 and NPR 6508. Bacteria were exposed in a static test to concentrations of diammonium persulfate up to 100 mg/L. The study revealed an EC10 (18 h) of 36 mg/L.