Hydrothermal synthesis product of calcium oxide, quartz and water

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1998

Report date:

1998

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

Cited as Directive 92/69/EEC, A.6

GLP compliance:

no

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

Silicic acid, calcium salt

EC Number:

215-710-8

EC Name:

Silicic acid, calcium salt

Cas Number:

1344-95-2

IUPAC Name:

Silicic acid, Calcium salt

Test material form:

solid

Specific details on test material used for the study:

- Details on test material: Name of test material (as cited in study report) = Calsil B (today called Sipernat 880);
- Analytical data after ignition: SiO2 91 %; Ca 6% (as CaO); Na 2 % (as Na2O); Al 0.2 % (as Al2O3); loss on ignition (2 h, 1000 °C): 15.0 +-0.1 % (w/w).

Results and discussion

Water solubility

Key result

Water solubility:

ca. 260 mg/L

Temp.:

20 °C

pH:

ca. 9.7

Details on results:

Concentration/loading: 6660 mg/L at 30 °C
The pH was inherent and not adjusted.
The indicated value range is the total of measured elements.

Any other information on results incl. tables

Solubility in water of a calcium silicate at 20 °C, pH 9.7

	48 h	72 h	96 h
SiO2 [mg/L]	200 ±10	190 ±10	190 ±10
Na^+  [mg/L ]	61 ±3	60 ±3	60 ±3
Ca^2+ [mg/L]	8.6 ±0.5	9.7 ±0.5	10.7 ±0.6

Overall solubility is about 260 mg/L.