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Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Endpoint:
activated sludge respiration inhibition testing
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1989 (rewritten 2004)
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Although the test is considered reliable with restrictions the test results should not be used for the derivation of a PNEC STP for iron since an insoluble iron form (diiron trioxide have been used). But it can be used to demonstrate the absence of toxic effects towards micro organisms for similar iron compounds.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1989

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
ISO 8192 (Water quality - Test for inhibition of oxygen consumption by activated sludge for carbonaceous and ammonium oxidation)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
Bayferrox 960 red; purity not specified
product No. 9028039, composition >= 88% Fe2O3, >= 3% SiO2 + Al2O3
loss on heating at 1000 °C (0.5 h) <= 11

Sampling and analysis

Analytical monitoring:
no

Test solutions

Vehicle:
no

Test organisms

Test organisms (species):
activated sludge of a predominantly domestic sewage

Study design

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

Results and discussion

Effect concentrations
Duration:
3 h
Dose descriptor:
EC50
Effect conc.:
>= 10 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Remarks:
respiration rate

Any other information on results incl. tables

nutrient solution: according to ISO 8192 (1986)

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
EC50 >= 10000mg/L
Executive summary:

Following the guideline ISO 8192 (Test for Inhibition of Oxygen Consumption by Activated Sludge) a 3-hour EC50 of > 10000 mg/l for Iron(III)oxide was obtained on activated sludge of a predominantly domestic sewage (Bayer AG 1989).