Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Ecotoxicological information

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.