Reaction mass of calcium disilicide and calcium silicide

Toxicity to microorganisms

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

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

Test material information

Constituent 1

Reference substance name:

Sodium silicate

EC Number:

239-981-7

EC Name:

Sodium silicate

Cas Number:

15859-24-2

IUPAC Name:

disodium oxosilanediolate

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.