Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 908-343-6 | CAS number: -
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
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
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 1.8 mg/L
Additional information
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
1.78 mg reaction mass yields 0.63 mg hydrogen peroxide
==> the 21d-NOEC (reaction mass) = 1.8 mg/L
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
