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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
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
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
136 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: cell growth inhibition (EbC50: 0-72 h)
Remarks on result:
other: 95 % confidence interval: 63 - 281 mg/L
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
320 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: growth rate reduction (ErC50: 0-72 h)
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
32 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: cell growth inhibition and growth rate reduction

Description of key information

The acute toxicity of the Persulfate Category to aquatic algae was tested in four studies. One study was available for disodium persulfate and three for diammonium persulfate. The studies were in accordance to OECD guideline 201 and EU Method C.3. The most sensitive EC50 (72 h) value for marine water was 320 mg/L with a NOEC of 32 mg/L.

Key value for chemical safety assessment

EC50 for marine water algae:
320 mg/L
EC10 or NOEC for marine water algae:
32 mg/L

Additional information

The acute toxicity of the Persulfate Category to aquatic algae was tested in three studies. One study was available for disodium persulfate and three for diammonium persulfate. The marine algal growth inhibition test with diammonium persulfate revealed an EC50 (72 h) of 320 mg/L, the most sensitive value available.