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EC number: 215-185-5
CAS number: 1310-73-2
The available data indicate that NaOH concentrations of 20 to 40 mg/L
may be acutely toxic to fish and invertebrates (single species tests).
Data on pH increases due to the addition of these amounts of NaOH in the
used test waters are lacking. In waters with a relatively low buffering
capacity, NaOH concentrations of 20-40 mg/L may result in a pH increase
with one to several pH units (EU RAR, 2007;section 126.96.36.199.3, page 30).
The OECD SIDS (2002) assigned a low code of reliability ('invalid' or
'not assignable') to all available tests, as in general the tests were
not conducted according to the current test guidelines (EU RAR, 2007;
section 188.8.131.52.4, page 30). Furthermore, in many tests reports there
were no data on pH, buffer capacity and/or test medium composition,
although this is essential information for toxicity tests with NaOH.
This is the most important reason why most of the tests were considered
'invalid'. Despite this lack of valid data, there is no need for
additional aquatic toxicity testing with NaOH, as all available tests
resulted in a rather small range of toxicity values (acute toxicity
tests: 20 to 450 mg/L; chronic toxicity test: > or = 25 mg/L) and there
are sufficient data on the pH ranges that are tolerated by major
Moreover, a generic PNEC cannot be derived from single-species toxicity
data for NaOH, as the pH of natural waters as well as the buffer
capacity of natural waters show considerable differences and aquatic
organisms/ecosystems are adapted to these specific natural conditions,
resulting in different pH optima and pH ranges that are tolerated (EU
RAR, 2007; section 184.108.40.206.4, page 30). According to the OECD SIDS
(2002), a lot of information is available about the relationship between
pH and ecosystem structure and also natural variations in pH of aquatic
ecosystems have been quantified and reported extensively in ecological
publications and handbooks.
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.
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