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PBT assessment

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PBT assessment: overall result

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Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR <= 1.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio 1.6 < MR <= 2.6
Type of composition:
legal entity composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio 1.6 < MR <= 2.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR <= 1.6
Type of composition:
legal entity composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR > 2.6
Type of composition:
legal entity composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR > 2.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR > 3.2
Type of composition:
legal entity composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - lumps or aqueous solutions of molar ratio MR > 3.2 - SIP
Type of composition:
boundary composition of the substance
State / form:
other: lumps or aqueous solutions
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio 1.6 < MR <= 2.6
Type of composition:
legal entity composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio 1.6 < MR <= 2.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio MR <= 1.6
Type of composition:
legal entity composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio MR <= 1.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio MR > 2.6
Type of composition:
legal entity composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
Name:
Silicic acid, sodium salt - powders of molar ratio MR > 2.6 - SIP
Type of composition:
boundary composition of the substance
State / form:
solid: particulate/powder
Reference substance:
Composition 1
Reference substance:
Composition 1
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.

Persistence Assessment

A persistence assessment is not applicable, since the substance is inorganic.

Bioaccumulation Assessment

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.

Toxicity Assessment

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.