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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: Study with very limited documentation and with no data on GLP compliance.

Data source

Reference
Reference Type:
publication
Title:
Trans Am Fish Soc 113 (1)
Author:
Millemann RE et al
Year:
1984
Bibliographic source:
Millemann RE et al; Trans Am Fish Soc 113 (1): 74-85 (1984)

Materials and methods

Test guideline
Guideline:
other: According to Giddings et al. (1983)
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
2-naphthol
EC Number:
205-182-7
EC Name:
2-naphthol
Cas Number:
135-19-3
Molecular formula:
C10H8O
IUPAC Name:
2-naphthol

Sampling and analysis

Analytical monitoring:
yes

Test organisms

Test organisms (species):
Nitzschia palea

Study design

Test type:
not specified
Water media type:
not specified
Total exposure duration:
4 h

Test conditions

Hardness:
No data
Test temperature:
No data
pH:
No data
Dissolved oxygen:
No data
Salinity:
No data
Nominal and measured concentrations:
No detailed data. 7 to 9 concentrations were tested; three replicates at each test concentration.
Reference substance (positive control):
not specified

Results and discussion

Effect concentrations
Duration:
4 h
Dose descriptor:
EC50
Effect conc.:
6.3 mg/L
Basis for effect:
other: Reduction of assimilationrate
Remarks on result:
other: 95 % Conf. Lim. 4.62 - 8.3 mg/l

Applicant's summary and conclusion

Conclusions:
A test (according to Giddings et al. (1983)) on algae Nitzschia palea for 4h showed a EC50 value of 6.3 mg/L.