Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Sediment toxicity

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
sediment toxicity: long-term
Type of information:
other: statement
Adequacy of study:
other information
Executive summary:

If released to the environment, silicic acid, aluminium magnesium sodium salt combines indistinguishably with the soil or sediment due to its chemical similarity with inorganic soil and sediment matter, and will be subjected to natural processes under environmental conditions (cation exchange, dissolution, sedimentation). Furthermore the amounts released are negligible in comparison to the release by natural deposit or alteration.

Endpoint:
sediment toxicity: long-term
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
read-across source
Qualifier:
according to guideline
Guideline:
other: ISO 10872
GLP compliance:
yes
Specific details on test material used for the study:
Test item: Silicic acid Aluminium Magnesium Sodium Salt
CAS No.: 12040-43-6
Test organisms (species):
Caenorhabditis elegans
Details on test organisms:
Caenorhabditis elegans, strain N2; J1 at test begin (mean initial body length: 262 (± 15 SD) µm)
Study type:
laboratory study
Type of sediment:
artificial sediment
Remarks:
Formulated sediment (according to ISO 10872) spiked with dispersions of the test item in water
Limit test:
no
Duration:
96 h
Test temperature:
19.8 – 20.3 °C
Nominal and measured concentrations:
Test concentrations:
nominal: 50, 200, 400, 800, 1600, 3200, 5000 mg/kg dry weight
Reference substance (positive control):
yes
Remarks:
Benzylcetyldimethylammonium chloride monohydrate (BAC-C16; 15 mg/l in aqueous medium)
Key result
Duration:
96 h
Dose descriptor:
LOEC
Effect conc.:
> 5 000 mg/kg sediment dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
reproduction
Key result
Duration:
96 h
Dose descriptor:
NOEC
Effect conc.:
5 000 mg/kg sediment dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
reproduction
Validity criteria fulfilled:
yes
Conclusions:
No inhibitory toxic effects occurred on growth and reproduction of C. elegans up to nominal concentrations of 5000 mg/kg sediment dry weight (dw). Thus a NOEC of 5000 mg/kg sediment dw based on nominal concentrations was determined. Between 200 and 3200 mg/kg sediment dw, significant stimulatory effects on reproduction occurred.
Endpoint:
sediment toxicity: long-term
Type of information:
other: reference link
Adequacy of study:
other information
Reason / purpose for cross-reference:
read-across source

Description of key information

If released to the environment, silicic acid, aluminium magnesium sodium salt combines indistinguishably with the soil or sediment due to its chemical similarity with inorganic soil and sediment matter, and will be subjected to natural processes under environmental conditions (cation exchange, dissolution, sedimentation).


Furthermore the amounts released are negligible in comparison to the release by natural deposit or alteration.


 


In addition there are studies in terrestrial toxicity which derived NOEC levels for silicic acid, aluminium magnesium sodium salt:


 


No inhibitory toxic effects occurred on growth and reproduction of nematods (C.elegans) up to nominal concentrations of 5000 mg/kg sediment dry weight (dw). Thus a NOEC of 5000 mg/kg sedi-ment dw based on nominal concentrations was determined. Between 200 and 3200 mg/kg sediment dw, significant stimulatory effects on reproduction occurred. (Hoess 2015).


 


A study on Eisenia fetida (Senn 2019) resulted in:


NOECMortality ≥ 1000 mg test item/kg soil (dw)


NOECBiomass ≥ 1000 mg test item/kg soil (dw)


NOECReproduction < 1000 mg test item/kg soil (dw)


According to the authors of the study, the test item concentration had revealed a statistically significant decrease of the reproduction compared to the control. Therefore, the NOEC for reproduction was smaller than the limit concentration. (Senn, 2019, SMAS)

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater sediment:
1 000 mg/kg sediment dw

Additional information