Registration Dossier

Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2014
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
Principles of method if other than guideline:

The water solubility of a substance can be considerably affected by the presence of impurities. This guideline addresses the determination of water solubility for essentially pure, nonvolatile and water-stable substances. This document described two methods, the column elution and the flask method, which cover a solubility threshold below 0.010 g/l and above 0.010 g/l respectively. A simple preliminary test is also described which allows to determine approximately the appropriate amount of sample to be used in the final test, as well as the time necessary to reach saturation. The substance (solids must be pulverized) is dissolved in water at the test temperature and under the conditions specified above. Subsequently. the mass concentration of the substance in the aqueous solution, which must not contain any undissolved particles, is determined by a suitable analytical method.
Type of method:
flask method

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Water solubility
Water solubility:
> 0.03 - < 0.07 g/L
Temp.:
20 °C
pH:
ca. 8
Details on results:
The water solubility value found is so low that we can confirm the insolubility in water of pyrite cinders.

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information): other: <0.05 g/L
The Pyrite cinders are constituted especially by iron oxides. The test confirmed the bibliography data that reporting that the iron oxides are insoluble at all the temperatures.
The result of the water solubility analysis may be due only to the presence of Calcium Solfate. The water solubility value found is so low that we can confirm the insolubility in water of pyrite cinders.