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EC number: 908-343-6
CAS number: -
No experimental data are available that assess the long-term toxicity of the reaction mass of calcium carbonate and calcium dihydroxide and calcium peroxide to aquatic invertebrates. Nevertheless, a 21d-NOEC value can be derived from reliable information that is available for hydrogen peroxide.The 21d-NOEC for the reaction mass is 1.8 mg/L
No experimental data are available that
assess the long-term toxicity of the reaction mass of calcium
carbonate and calcium dihydroxide and calcium peroxide to aquatic
invertebrates. Nevertheless, for this endpoint reliable informationis
available for hydrogen peroxide (H2O2), one of the
primary hydrolytic degradation products of the reaction mass of
calcium carbonate and calcium dihydroxide and calcium peroxide.
The long-term toxicity of hydrogen
peroxide to invertebrates was tested in a 21d experiment with Daphnia
pulex (Meinertz et al, 2008). The test was performed in 2008 according
to an ASTM guideline. The 21d-NOEC value (based on reproduction) determined
from this study was 0.63 mg/L.
From this 21d-NOEC value a
corresponding 21d-NOEC value can be calculated for the reaction mass, by
taking into account the applicable chemical reaction (i.e. the amount of
hydrogen peroxide formed is equimolar to the amount of
calcium peroxide present in the reaction mass) and the
composition of the reaction mass (i.e. the reaction mass contains ca.
75% calcium peroxide).
Thus: 100 mg of the reaction mass
contains 75 mg of calcium peroxide, which corresponds to 1.04 mmol of
calcium peroxide. Therefore, 1.04 mmol (= 35.36 mg) of hydrogen peroxide
is formed upon dissolution of 100 mg of calcium peroxide.
As a consequence, the 21d-NOEC for the
reaction mass, when calculated based on the 21d-NOEC for hydrogen
peroxide (0.63 mg/L) is:
100 mg reaction
mass yields 35.36 mg hydrogen peroxide
mass yields 0.63 mg hydrogen peroxide
21d-NOEC (reaction mass)
= 1.8 mg/L
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