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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2008

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Freshwater Alga and Cyanobacteria, Growth Inhibition Test)
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Methyl dihydrogen phosphate
EC Number:
212-379-1
EC Name:
Methyl dihydrogen phosphate
Cas Number:
812-00-0
Molecular formula:
CH5O4P
IUPAC Name:
methyl dihydrogen phosphate
Test material form:
liquid

Sampling and analysis

Analytical monitoring:
no

Test organisms

Test organisms (species):
Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h

Test conditions

pH:
- Intitial pH (0 h) 2.30 to 6.60
- Final pH (72 h) 7.50 to 8.64
Nominal and measured concentrations:
Nominal test concentrations of 56.2, 100.0, 177.8, 316.2, 562.3 and 1000 mg/L
Reference substance (positive control):
yes
Remarks:
3,5-dichlorophenol (1.5 mg/L)

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate

Applicant's summary and conclusion

Conclusions:
EC50 (72 h) was reported as > 1000 mg/L and the NOEC was reported as 1000 mg/L.
Executive summary:

Investigation of algal growth rate under static conditions gave an EC50 (72 h) value of > 1000 mg/L and the NOEC was reported as 1000 mg/L.