Registration Dossier
Registration Dossier
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EC number: 231-595-7 | CAS number: 7647-01-0
Endpoint summary
Administrative data
Description of key information
Additional information
It is accepted that the toxic effects of hydrochloric acid result from the presence of the H+ ion and the resultant lowered pH. A full suite of standard core aquatic toxicity studies showing the effects of lowered pH with hydrochloric acid are available. The aquatic toxicity data show that a distinct acidic pH is detrimental to aquatic organisms (pH < 3-5). To get to that pH level in weakly buffered natural waters (= worst case) however, at least 10 mg/L HCl would be required, see OECD SIDS on Hydrogen Chloride, 2002, chapter 2.2.2 with Table 2-1 (based on Groot de W.A. and Dijk van N.R.M., 2002, Addition of hydrochloric acid to a solution with sodium bicarbonate to a fixed pH., Solvay Pharmaceuticals; Study No. A SOL.S.027). Thus, since the resultant pH in the environment will be dependent on the buffering capacity of the water body, it is considered that toxicity end-points in terms of mg/L hydrochloric acid are meaningless. Similarly, it is not considered useful to calculate PNECs for hydrochloric acid because factors such as the buffer capacity, the natural pH and the fluctuation of the pH are very specific for a certain ecosystem.
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.
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