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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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toxicity to aquatic algae and cyanobacteria
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
Justification for type of information:
The target substance is hydrolytically unstable with hydrolysis half-life less than 5 minute. The hydrolysis products include 1-propanol and hydrated zirconium dioxide. The ecotoxicity data of the organic parts have been well-investigated and used for read-across.
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
according to guideline
other: not specified
Principles of method if other than guideline:
not specified
GLP compliance:
not specified
Analytical monitoring:
Test organisms (species):
Chlorella pyrenoidosa
Test type:
Water media type:
Limit test:
Total exposure duration:
48 h
Key result
48 h
Dose descriptor:
Effect conc.:
ca. 1 150 mg/L
Nominal / measured:
Conc. based on:
test mat.
Basis for effect:
growth rate
Validity criteria fulfilled:

Description of key information

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
1 150 mg/L

Additional information

No studies were conducted on the target substance, Zirconium tetrapropanolate. As the target substance hydrolyses rapidly (half-life < 5 minutes) the intrinsic properties are related to hydrolysis products of the target substance.

On the basis that if entering the environmental, this substance will quickly dissociate to form the inorganic (poorly soluble) zirconium dioxide and well-evaluated organic substances – 1-propanol.

The zirconium dioxide is not considered further in this report as aquatic toxicity assessments do not apply.

Toxicity of 1-propanol to algae were tested on several species:Selenastrum capricornutum, Scenedesmus pannonicus, andChlorella pyrenoidosa. NOEC (48-96h) based growth rate values were 2000, 2900 and 1150 mg/l respectively. (Slooff et al. 1983). The lowest value of 1150 mg/l tested onChlorella pyrenoidosawere chosen for CSA.