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Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Endpoint:
toxicity to microorganisms
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)

Data source

Reference
Reference Type:
secondary source
Title:
OECD SIDS Soluble silicates
Author:
OECD
Year:
2004

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: EU guidelines 82/242/EEC and 82/243/EEC
Deviations:
not applicable
Remarks:
biological activity of a model sewage treatment plant was determined
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Test type:
other: STP simulation test
Water media type:
freshwater
Limit test:
yes

Results and discussion

Effect concentrations
Dose descriptor:
EC0
Effect conc.:
25 mg/L
Conc. based on:
dissolved
Remarks:
silicate
Basis for effect:
other: At doses of 25 mg/l, sodium silicate had no adverse effect on the biodegradation of easily degradable nutrients fed simultaneously to the modell STP:
Details on results:
At doses of 25 mg/l, sodium silicate had no adverse effect on the biodegradation of easily degradable nutrients fed simultaneously: DOC (Dissolved Organic Carbon), pH and dry weight of activated sludge was comparable to the untreated control model plants. Visual inspection of colour and settling behaviour of activated sludge also did not reveal any differences between treated and untreated test runs.

Any other information on results incl. tables

Elimination of sodium silicate in the model sewage treatment plant was only marginal; 90 - 100 % was detected in the effluent.

Applicant's summary and conclusion