Gallium trichloride

Short-term toxicity to aquatic invertebrates

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:

test procedure in accordance with national standard methods

Data source

Reference

Reference Type:

publication

Title:

Acute Toxicity of Gallium and Effects of Salinity on Gallium Toxicity to Brackish and Marine Organisms

Author:

N. Onikura, A. Nakamura, K. Kishi

Year:

2005

Bibliographic source:

Bulletin of Environmental Contamination and Toxicology. 75: 356-360

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: US EPA 1993. methods for measuring the acute toxicity of effluents and receiving waters to freshwater and marine organisms (fourth edition).

Version / remarks:

EPA 600/4-90/027F

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Gallium trichloride

EC Number:

236-610-0

EC Name:

Gallium trichloride

Cas Number:

13450-90-3

Molecular formula:

Cl3Ga

IUPAC Name:

gallium trichloride

Test material form:

not specified

Sampling and analysis

Analytical monitoring:

not specified

Test solutions

Vehicle:

not specified

Test organisms

Test organisms (species):

Americamysis bahia (previous name: Mysidopsis bahia)

Study design

Test type:

static

Water media type:

brackish water

Limit test:

no

Total exposure duration:

96 h

Test conditions

Test temperature:

25°C

pH:

7.5-8.0

Dissolved oxygen:

80%-99%

Salinity:

26g/l

Nominal and measured concentrations:

controle and five exposure concentrations, nominal concentrations not specified

Details on test conditions:

four replications per concentrations
Acute toxicity tests were performed for 96h by standard methods (US EPA, 1993). ten newly-hatched nauplii were transferred to 50 ml of test medium in an 80 ml vessel. each test was performed using one control and five exposure concentrations. Four replications were used for each expousre concentration. Mortality was observed on a daily basis, and 24 h and 96 h median lethal concentrations were calculated based on the survival rates.

Reference substance (positive control):

no

Results and discussion

Effect concentrations

Effect concentrations 1

Key result

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

32.3 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Effect concentrations 2

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

12.76 mg/L

Nominal / measured:

nominal

Conc. based on:

element

Remarks:

Ga

Basis for effect:

mortality

Effect concentrations 3

Duration:

24 h

Dose descriptor:

LC50

Effect conc.:

22.47 mg/L

Nominal / measured:

nominal

Conc. based on:

element

Remarks:

Ga

Basis for effect:

mortality

Applicant's summary and conclusion

Validity criteria fulfilled:

not applicable

Conclusions:

The 96-h LC50 for effect of GaCl3 on the estuarine crustacean Americamysis bahia is 12.8 mg Ga/L.