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EC number: 931-257-5
CAS number: 68131-74-8
of the hydrolysis as a function of pH is based on an examination of a
change in the test substance concentration in buffers of various pH with
time. That requires that a substance the hydrolysis of which is to be
examined should be univocally defined, as pure as possible and, at the
same time, sufficiently soluble in water, as it also states in the
guideline (EU C.7): “This method is applicable only to water-soluble
substances. Impurities may affect the results.”. It is obvious that the
test substance is not well chemically defined, so the determination of
what is the main component the hydrolysis of which should be examine and
what are impurities is questionable. In addition all main components of
the test substance are water insoluble (SiO2, Al2O3 and Fe2O3).
free calcium oxide dissociates slowly in water into form calcium oxide
and water. Calcium and hydroxide ions, or hydrogen and oxygen are
naturally ubiquitous in the environment.
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