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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Short-term toxicity to aquatic invertebrates

Administrative data

Endpoint:
short-term toxicity to aquatic invertebrates
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is highly insoluble in water, hence indicating that aquatic toxicity is unlikely to occur
other:
Cross-reference
Reason / purpose for cross-reference:
data waiving: supporting information
Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 Nov 2018 - 20 Dec 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
not specified
GLP compliance:
yes
Type of method:
flask method
Specific details on test material used for the study:
Chemical name: Magnesium potassium fluoride silicate (Mg2.7K0.7Si4O10F2)
Previously known as: magnesium potassium silicon fluoride hydroxide oxide, and referenced as CAS number 273730-58-8
Trade name: MICROMICA
Composition formula: K₀.₇Mg₂.₇Si₄O₁₀F₂
Molecular weight: 403.33 g/mol
Purity of test item: ≥95%
Impurity: <5% water
Lot number: 776A
Key result
Water solubility:
ca. 1.02 mg/L
Conc. based on:
element (dissolved fraction)
Remarks:
total silcon content
Loading of aqueous phase:
1 g/L
Incubation duration:
>= 6 - <= 8 d
Temp.:
20 °C
pH:
ca. 6.6

Agitation period (days)

Sample

pH

Measured silicon content of the test solution (mg/L)

Concentration of test item in test solution* (mg/L)

Maximum measured difference (%)

 

Mean

4

1a

6.3

0.194

0.731

-

24.6

-

-

1b

6.3

0.195

0.732

5

2a

6.7

0.226

0.849

22.1

2b

6.5

0.225

0.845

6

3a

6.6

0.246

0.924

1.02

14.9

3b

6.6

0.258

0.970

7

4a

6.3

0.283

1.06

-

4b

6.3

0.289

1.09

8

5a

6.8

0.278

1.05

-

5b

6.9

0.281

1.05

*The silicon content of the test item was 26.6% so the measured silicon content of the test solution was multiplied by 3.76 (100/26.6) to calculate the concentration of test item in test solution.

As the maximum difference in silicon content between test solutions 3, 4 and 5 (a and b) was less than 15% (14.9%), it was judged that the silicon concentrations of these test solution reached equilibrium and are therefore valid. Samples 1 and 2 (a and b) are discounted.

Conclusions:
Aqueous samples, with a 1 g/L loading, were incubated for 6, 7 and 8 days at 30 °C and silicon content measured via ICP-AES. As the silicon content of the test item was 26.6%, the aqueous solubility of the test item was determined to be 1.02 mg/L at 20 °C.
Executive summary:

The aqueous solubility of the test item was measured in a GLP study performed using method OECD 105. Aqueous samples, with a 1 g/L loading, were incubated for 6, 7 and 8 days at 30 °C and silicon content measured via ICP-AES. As the silicon content of the test item was 26.6%, the aqueous solubility of the test item was determined to be 1.02 mg/L at 20 °C.

Data source

Materials and methods

Results and discussion

Applicant's summary and conclusion