Registration Dossier
Registration Dossier
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EC number: 200-848-3 | CAS number: 75-20-7
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- As calcium carbide instantly hydrolyses to Ca(OH)2 and C2H2 upon contact with water/moisture the assessment is based on the degradation products. For details please refer to the read across report in section 13.
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Type:
- log Pow
- Partition coefficient:
- ca. 0.37
- Remarks on result:
- other: pH and temperature not reported in EPISuite (v4.11) reference.
- Conclusions:
- The substance Calcium acetylide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products.
The log Kow of acetylene is 0.37. - Executive summary:
The substance Calcium acetylide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products.
The experimental log Kow of acetylene is 0.37 (Hansch et al., 1995, cited in EPISuite (v4.11)).
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reference
Description of key information
The endpoint partition coefficient is not applicable to calcium carbide as the substance decomposes on contact with water. The experimental log Kow of the decomposition product acetylene is 0.37 and is considered to be the relevant log Kow for chemical safety assessment.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 0.37
- at the temperature of:
- 20 °C
Additional information
The endpoint partition coefficient is not applicable to calcium carbide as the substance decomposes on contact with water.
However, the substance instantly hydrolyses upon contact with water, yielding Ca(OH)2 and C2H2. Thus, the assessment has to consider the relevant decomposition products:
- Ca(OH)2: The substance is inorganic hence the endpoint partition coefficient is not applicable; calcium hydroxide is considered to be of no environmental concern due to rapid neutralisation of OH- in buffered environmental compartments, and due to calcium being a ubiquitous and essential mineral nutrient; calcium hydroxide is hence not considered to be the relevant degradation product.
- C2H2: The experimental log Kow of acetylene is 0.37 (Hansch et al., 1995, cited in EPISuite v4.11) and is considered to be the relevant log Kow for chemical safety assessment.
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
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.
