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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: well documented and well performed according to scientific standards

Data source

Reference
Reference Type:
publication
Title:
Toxicity of sixty-three metals and metalloids to Hyalella azteca at two levels of water hardness.
Author:
Borgmann U, Couillard Y, Doyle P, Dixon G
Year:
2004
Bibliographic source:
Environmental Toxicology and Chemistry 24, 641-652

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Culturing and toxicity tests were conducted in an incubator at 24 to 25°C under a 16:8-h light:dark photoperiod. Culture water was renewed and young separated from adults weekly on Mondays. Toxicity tests were set up Tuesday to Friday, making the initial age of the test animals 1 to 11 d at the start of the test.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
yes

Test organisms

Test organisms (species):
other aquatic crustacea: Hyalella azteca

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
7 d

Test conditions

Hardness:
18 mg/L CaCO3
Test temperature:
24-25°C
pH:
7.39
Nominal and measured concentrations:
Test concentrations were analytically confirmed.

Results and discussion

Effect concentrationsopen allclose all
Duration:
7 d
Dose descriptor:
LC50
Effect conc.:
0.426 mg/L
Nominal / measured:
nominal
Conc. based on:
element
Basis for effect:
mortality
Remarks on result:
other: CI:0.293-0.618; tap water
Duration:
7 d
Dose descriptor:
LC50
Effect conc.:
0.465 mg/L
Nominal / measured:
nominal
Conc. based on:
dissolved
Basis for effect:
mortality
Remarks on result:
other: CL: 0.298-0.724 mg/L; soft water
Duration:
7 d
Dose descriptor:
LC50
Effect conc.:
0.494 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
dissolved
Basis for effect:
mortality
Remarks on result:
other: CL: 0.319- 0.765 mg/L; soft water

Applicant's summary and conclusion

Conclusions:
The lowest 7-d LC50 for mortality of the freshwater invertebrate Hyalella azteca is 0.426 mg As/L in tap water.