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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:
other: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
Reaction mass of aluminium and magnesium oxide and spinel (Mg(AlO2)2)
EC Number:
701-289-2
Molecular formula:
Al, MgO, Mg(AlO2)2
IUPAC Name:
Reaction mass of aluminium and magnesium oxide and spinel (Mg(AlO2)2)
Details on test material:
Content: aluminium 708,000 mg/kg, magnesium 68,000 mg/kg, ammonium 22,000 mg/kg, and other ingredients
Batch number: Delivery of 21.04.2009
Expiry date: 2011-08-21

Sampling and analysis

Analytical monitoring:
yes

Test solutions

Vehicle:
no

Test organisms

Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)

Study design

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

Test conditions

Nominal and measured concentrations:
nominal: 6.3, 12.5, 25, 50 and 100 mg/L
Reference substance (positive control):
not required

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
other: actual loading
Basis for effect:
growth rate
Remarks on result:
other: based on Al-Skimmings
Duration:
72 h
Dose descriptor:
EC10
Effect conc.:
> 12.5 - < 25 mg/L
Nominal / measured:
nominal
Conc. based on:
other: actual loading
Basis for effect:
growth rate
Remarks on result:
other: based on Al-Skimmings
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
12.5 mg/L
Nominal / measured:
nominal
Conc. based on:
other: actual loading
Basis for effect:
growth rate
Remarks on result:
other: based on Al-Skimmings
Duration:
72 h
Dose descriptor:
LOEC
Effect conc.:
25 mg/L
Nominal / measured:
nominal
Conc. based on:
other: actual loading
Basis for effect:
growth rate
Remarks on result:
other: based on Al-Skimmings

Any other information on results incl. tables

Chemical analysis

 Test item concentration [mg/L]     Aluminium determination (mean of two replicates) [mg/L]
   0h  72h
 Control  0.0014*  < 0.001
 6.3  0.0197  0.0102
 12.5  0.0190  0.0096
 25  0.0270  0.0141
 50  0.0824  0.0134
100  0.1062  0.0266
  100 without algae  0.1279  0.0483

*The recovery of Al at a concentration slightly higher than the LOQ

(1.0 μg/L) is not considered critical with respect to control performance.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Executive summary:

The acute toxicity of Aluminia Skimmings to alga (Desmodesmus subspicatus former name: Scenedesmus subspicatus) was tested according to OECD guideline 201 ' Alga, Growth Inhibition Test' (2006). During 72 hours exposure an ErC50 of >100 mg/L and ErC10 of >12.5<25 mg/L was measured and a NOEC of 12.5 mg/L was calculated (Currenta, 2010).

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