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EC number: 231-130-8
CAS number: 7440-21-3
Silicon is more susceptible to hydrolysis
(more soluble) in neutral and alkaline solutions than in acidic
solutions. The ionic composition (e. g. Cl) and higher ionic strength of
solvents seems to clearly increase the hydrolysis rates.
In the OECD T/Dp screening test solutions
very small quantities of elements were released from the particle mass
in both pH 6 and 8 media. In total, only a very small portion (less than
0.2%) of the loaded amount of particles sized less than 1 mm of Si HG,
Si LG and PCS was released/dissolved upon the 24hour exposure to the
OECD T/Dp test media. In comparison synthetic media pH 7.4 dissolved
even more than 10% of test material in 24 hours. More than 50% of PCS
material was transformed/dissolved in 168 hours.
In addition, the full 7 and 28 day T/Dp tests
revealed that the elements that were analysed were only present in very
low concentrations, and similar to the screening tests, Si was only
present at a concentration of 0.2-0.3 % of the initial amount loaded.
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