Registration Dossier
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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
In a STP simulation test, at doses of 25 mg/l of soluble sodium silicate had no adverse effect on functioning of STP and the biodegradation of easily degradable nutrients fed simultaneously. Fine amorphous silica particles (< 1 µm) may have toxic growth inhibition effects on microbes at high (> 100 mg/l) concentrations
Key value for chemical safety assessment
Additional information
Silica particles may have toxic growth inhibition effects on microbes at high concentrations. Addition of SiO2(aver size 205 nm) at 5000ppm resulted in 99% growth reduction ofB.subtilisand 1000 ppm to 7 ± 4.7%. At 5000 mg/l a 48% reduction and at 500 mg/l reduction of 15±6.4 % of E. coli was observed.
Soluble silicate effect on STP functions has been studied and the results indicate that 25 mg/l soluble silicate did not harm waste water treatment plant function.
The test studied functioning of WWTP rather than the toxicity of soluble silicic acid towards microorganisms.
In a simulation test following the OECD confirmatory test procedure, the elimination and influence of silicate (spray-dried sodium silicate) on functioning of model sewage treatment plant was studied. 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. Elimination of sodium silicate in the model sewage treatment plant was only marginal; 90 - 100 % was detected in the effluent. The study was carried out in compliance with GLP and EU guidelines 82/242/EEC and 82/243/EEC Sufficient information is not available to derive reliable toxity test based PNEC values for silica fume.
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