[No public or meaningful name is available]

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Data waiving:

study technically not feasible

Justification for data waiving:

other:

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
According to Annex XI, part 2 of Regulation (EC) No 1907/2006 (REACH) testing for a specific endpoint may be omitted if it is technically not possible to conduct the study as a consequence of the properties of the substance itself. A study to investigate the adsorption / desorption characteristics of Hydrothermal synthesis product of calcium oxide, quartz and water has not been conducted. The justifications for not providing these data are as follows:
- A screening study according to OECD Guideline 121 is not technically possible as the test method is not validated for inorganic substances.
- A batch equilibrium study according to OECD Guideline 106 was deemed to be not applicable to the test substance. Both quartz and chalk are natural constituents of soils and as such analysis of the test material may not be possible due to interference from the soil extracts that may leach into the aqueous media during the test. This would prevent quantification of the test material.
Furthermore Silica /silicate are one of the most abundant materials in earth´s surface. Whatever its origin, man-made or natural silica, once released into the environment, no distinction can be made.