Registration Dossier
Registration Dossier
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EC number: 215-181-3 | CAS number: 1310-58-3
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
Potassium hydroxide is a strong alkaline substance that dissociates completely in water to K+ and OH- (OECD SIDS potassium hydroxide, 2002).
Therefore, the only posssible effect would result from the pH effect. However pH will remain between environmentally expected ranges.
Key value for chemical safety assessment
Additional information
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 (also compare with EU RAR on NaOH, 2007; section 3.2.1.1.4, page 30). Furthermore, in many test reports there were no data on pH, buffer capacity and/or test medium composition, although this is essential information for toxicity tests with KOH. This is the most important reason why most of the tests were considered 'invalid'.
Despite of this, there is no need for additional aquatic toxicity testing with KOH since all available tests resulted in a rather small range of toxicity values (acute toxicity tests to fish: 50 to 165 mg/L) and there are sufficient data on the pH ranges that are tolerated by major taxonomic groups.
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