Lime (chemical), hydraulic

Water solubility

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010-03-05 to 2010-05-21

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

yes

Remarks:

High purity water was used instead of glass-double distilled water; No glass was used in critical sample preparation and handling steps

Principles of method if other than guideline:

Due to the necessity to analyse for silicon, approximately 18 MΩ high purity water was used as an alternative to glass-double distilled water during the preliminary test and the definitive test whilst monitoring minor components/impurities. It was not appropriate to use water prepared in a glass apparatus due to potential interferences on analysis and in addition, the use of glass was also excluded from critical sample preparation and handling steps. This deviation was not considered to impact on the validity of the determinations, but was an essential step to generate reliable dissolved silicon data. Glass-double-distilled water was used for the definitive test calcium determination.

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2009-11-26

Type of method:

flask method

Water solubility:

1 010 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: This is the water solubility of calcium as determined in the study. Variation of temperature was ± 0.5 °C.

Water solubility:

0.115 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: This is the water solubility of iron as determined in the study. Variation of temperature was ± 0.5 °C.

Water solubility:

0.305 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: This is the water solubility of silicon as determined in the study. Variation of temperature was ± 0.5 °C.

Water solubility:

0.158 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: This is the water solubility of aluminium as determined in the study. Variation of temperature was ± 0.5 °C.

Details on results:

The preliminary test results indicated that, with exception of one sample (nominal lading rate of 1.0 g/L), no loading rate dependent solubility characterisitcs were observed. For the one sample, elevated alumnium and silicon concentrations were detected, but it was immediatley obvious that the sample solution was not saturated with respect to the dominant element, calcium. Therefore, this loading rate was not suitable for the definitive test determination, which should be prepared typically at five times the concentration required to achieve saturation. The reduced calcium concentration of this sample, due to insufficient test material being present to achieve saturation, possibly allowed the additional dissolution of the aluminium and silicon containing components.

For the definite test (minor components and impurites) an increasing trend in solubilised alumnium concentration with initial saturation time was observed. However, as solubility remained low (<0.2 mg/l) even after an initial saturation period of 72 hours at 30 °C, no additional testing was considered necessary.

Conclusions:

The water solubility has been determined for four components of lime (chemical) hydraulic. The four components and the water solubility of these are as follows:
1) 1010 mg calcium/L at 20.0 ± 0.5 °C
2) 0.158 mg aluminium/l at 20.0 ± 0.5 °C
3) 0.305 mg silicon/l at 20.0 ± 0.5 °C
4) 0.115 mg iron /l at 20.0 ± 0.5 °C.
An exact water solubility of lime (chemical) hydraulic can not be determined since the molecular formula of the test item is unknown. However, since calcium is the main component of the test material it can be assumed that the test item is soluble in water.

Reference 2

Endpoint:

water solubility

Type of information:

other: Study used in support of read-across of pH-related health effects (acute and repeated-dose inhalation toxicity, skin and eye irritation) from CaO to calcined dolomite.

Adequacy of study:

supporting study

Study period:

2010-03-23 to 2010-04-30

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

, 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2009-11-26

Type of method:

flask method

Water solubility:

956 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: This is the water solubility of calcium. The temperature was ± 0.5 °C.

Water solubility:

1 337.6 mg/L

Temp.:

20 °C

pH:

12.3

Remarks on result:

other: The water solubility of CaO was not stated in the study report. Therefore the value was recaluted from the water solubility value of calcium as stated in the study report.

Details on results:

No further relevant information was stated.

Conclusions:

Interpretation of results (migrated information): soluble (1000-10000 mg/L)
The water solubility of the test item and /or degradation products has been determined to be 956 mg calcium/l of solution at 20.0 ± 0.5 °C (recalculated value for calcium oxide: 1337.6 mg/l).

Executive summary:

The water solubility of calcium oxide was tested by measuring the concentration calcium ions in saturated solution. The solubility of calcium oxide was recalculated from the water solubility value of calcium, which was stated in the study report.

Reference 3

Endpoint:

water solubility

Type of information:

other: Study used in support of read-across of pH-related health effects (acute and repeated-dose inhalation toxicity, skin and eye irritation) from Ca(OH)2 to lime (chemical) hydraulic.

Adequacy of study:

supporting study

Study period:

2010-03-23 to 2010-04-30

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2009-11-26

Type of method:

flask method

Water solubility:

999 mg/L

Temp.:

20 °C

pH:

12.4

Remarks on result:

other: This is the water solubility for calcium as determined in the test report. The temperature was maintained within ± 0.5 °C.

Water solubility:

1 844.9 mg/L

Temp.:

20 °C

pH:

12.4

Remarks on result:

other: The water solubility of Ca(OH)2 was not stated in the study report. Therefore the value was recaluted from the water solubility value of calcium as stated in the study report.

Details on results:

No further relevant information was stated.

Conclusions:

Interpretation of results (migrated information): soluble (1000-10000 mg/L)
The water solubility of the test item has been determined to be 999 mg calcium/L of solution at 20.0 ± 0.5 °C (recalculated value for calcium dihydroxide: 1844.9 mg/l).

Executive summary:

The water solubility of calcium dihydroxide was tested by measuring the concentration calcium ions in saturated solution.

The solubility for calcium dihydroxide was recalculated from the water solubility value of calcium, which was stated in the study report.

Description of key information

The water solubility has been determined for four components of lime (chemical) hydraulic (study result,  modified EU A.6 method). The water solubilities of these four elements were determined as follows:

1) 1010 mg calcium/L at 20.0 ± 0.5 °C

2) 0.158 mg aluminium/l at 20.0 ± 0.5 °C

3) 0.305 mg silicon/l at 20.0 ± 0.5 °C

4) 0.115 mg iron /l at 20.0 ± 0.5 °C.

An exact value for the water solubility of lime (chemical) hydraulic can not be determined since the molecular formula of the test item is unknown. However, since calcium is the main component of the test material it can be assumed that the test item is soluble in water.

Additional information

pH of the saturated solution: 12.3

The water solubility has been determined for four elements present in lime (chemical) hydraulic (study result, modified EU A.6 method. The water solubilities of these four elements were determined as follows:

1) 1010 mg calcium/L at 20.0 ± 0.5 °C

2) 0.158 mg aluminium/l at 20.0 ± 0.5 °C

3) 0.305 mg silicon/l at 20.0 ± 0.5 °C

4) 0.115 mg iron /l at 20.0 ± 0.5 °C.

An exact value for the water solubility of lime (chemical) hydraulic can not be determined since the molecular formula of the test item is unknown. However, since calcium is the main component of the test material it can be assumed that the test item is soluble in water.