Registration Dossier
Registration Dossier
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EC number: 206-059-0 | CAS number: 298-14-6
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Potassium hydrogencarbonate is not expected to have an intrinsic toxic activity to aquatic organisms
Key value for chemical safety assessment
Additional information
Potassium hydrogencarbonate is an alkaline substance, which dissociates completely to form potassium cations (K+) and inorganic carbon species. Depending on pH of the receiving waters CO2 is the predominant species at pH values below 6.35, while HCO3- is the predominant species at a pH in the range between 6.35 and 10.33 and CO32- is the predominant species at pH values above 10.33.
In the majority of the natural waters, pH levels are between 6 and 10. Thus HCO3- (pKa= 10.33) is the most important species for the buffer capacity. Therefore the pH will remain within environmentally expected ranges.
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