Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2003
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Deviations:
yes
Remarks:
poorly documented
GLP compliance:
not specified
Specific details on test material used for the study:
4-Allyl-1,2-dimethoxybenzene
Analytical monitoring:
yes
Vehicle:
not specified
Test organisms (species):
Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h
Nominal and measured concentrations:
1.0, 2.2, 4.6, 10, 22, 46, 100 mg/L
Details on test conditions:
TEST SYSTEM
- Test vessel: 100 mL
- Initial cells density: 1*10E4
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 1

GROWTH MEDIUM
- Standard medium used: yes

OTHER TEST CONDITIONS
- Adjustment of pH: No
- Photoperiod: 24 hours
- Light intensity and quality: 4000-5000 Lx

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : Growth rate and biomass
Reference substance (positive control):
not specified
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
18.9 mg/L
Nominal / measured:
meas. (geom. mean)
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
9.35 mg/L
Nominal / measured:
meas. (geom. mean)
Conc. based on:
test mat.
Basis for effect:
growth rate
Details on results:
The 72h-EC50 based on growth rate inhibition in green algae is 18.9 mg/L (95% CL: 17.1-20.9 mg/L).
The 72h-EC50 based on biomass inhibition in green algae is 9.64 mg/L (95% CL: 8.82-10.5 mg/L).
The 72h-NOEC based on growth rate inhibition in green algae is 9.35 mg/L.
The 72h-NOEC based on biomass inhibition in green algae is 2.06 mg/L.
Validity criteria fulfilled:
not specified
Conclusions:
The 72h-EC50 and 72h-NOEC in green algae based on growh inhibition rate was determined to be 18.9 mg/L and 9.35 mg/L respectively.
Executive summary:

An algae growth inhibition test was performed according to OECD Guideline 201 in Pseudokirchneriella subpicata. 10E4 green algae were exposed up to 100 mg/L test item (3 replicates per dose) 72 hours under static condicions.Test item concentration was measured by HPLC analysis. Growth inhibition rate and biomass inhibition rates were evaluated. The 72h-EC50 and 72h-NOEC in green algae based on growh inhibition rate was determined to be 18.9 mg/L (95% CL: 17.1 -20.9 mg/L) and 9.35 mg/L respectively. The 72h-EC50 and 72h-NOEC in green algae based on biomass inhibition rate was determined to be 9.64 mg/L (95% CL: 8.82 -10.5 mg/L) and 2.06 mg/L respectively.

Description of key information

Key study: Test method OECD 201. The 72h-EC50 and 72h-NOEC in green algae based on growh inhibition rate was determined to be 18.9 mg/L and 9.35 mg/L respectively.

Key value for chemical safety assessment

EC50 for freshwater algae:
18.9 mg/L
EC10 or NOEC for freshwater algae:
9.35 mg/L

Additional information