Registration Dossier
Registration Dossier
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EC number: 229-912-9 | CAS number: 6834-92-0
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- Sodium metasilicate anhydrous
- Type of composition:
- legal entity composition of the substance
- State / form:
- other: granules or aqueous solutions
- Reference substance:
- Sodium metasilicate anhydrous
- Name:
- Sodium metasilicate nonahydrate
- Type of composition:
- legal entity composition of the substance
- State / form:
- other: granules or aqueous solutions
- Reference substance:
- Sodium metasilicate nonahydrate
- Name:
- Sodium metasilicate pentahydrate
- Type of composition:
- legal entity composition of the substance
- State / form:
- other: granules or aqueous solutions
- Reference substance:
- Sodium metasilicate pentahydrate
- Name:
- Sodium metasilicate - granules - SIP
- Type of composition:
- boundary composition of the substance
- State / form:
- solid: particulate/powder
- Reference substance:
- Sodium metasilicate - granules - SIP
- PBT status:
- PBT assessment does not apply
- Justification:
Summary and overall conclusions on PBT or vPvB properties
Soluble silicates are not PBT or vPvB candidate substances.
PBT/vPvB criteria and justification
A persistence assessment is not applicable, since the substance is inorganic.
Compounds of silicon and oxygen are ubiquitous in the environment; they are present in inorganic matter, like minerals and soils as well as in organic matter, like plants, animals and man. Silicon is an essential trace element participating in the normal metabolism of higher animals. It is required in bone, cartilage and connective tissue formation as well as participating in other important metabolic processes (HERA 2005).
Toxicokinetic data on vertebrates revealed a low potential for bioaccumulation. Ingested silicates are excreted via urine and to a lesser extent via the faeces. Markedly increased and rapid urinary excretion of silica was observed when soluble sodium silicates were administered to rats (Benke & Osborn 1979), dogs (King et al. 1933), cats (King & McGeorge 1938) and guinea pigs (Sauer et al. 1959). The urinary silicon excretion half-life after administration of sodium silicate to rats via stomach tube was 24 h (Benke & Osborn 1979).
Based on these considerations no bioaccumulation is to be expected.
The toxicity criterion is not fulfilled for ecotoxicity with no ecologically relevant NOECs less than 0.01 mg/L (lowest NOEC: 35 mg/L, algae). The substance is not classified as carcinogenic, mutagenic or toxic for reproduction nor is there any evidence of chronic toxicity, as identified by the classifications: T, R48, or Xn, R48 according to Directive 67/548/EEC.
Referenceopen allclose all
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