Registration Dossier
Registration Dossier
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EC number: 206-059-0 | CAS number: 298-14-6
Endpoint summary
Administrative data
Description of key information
Biodegradation is not relevant because potassium hydrogencarbonate is an inorganic substance.
Additional information
Abiotic degradation
High water solubility and very low vapour pressure indicate that potassium hydrogencarbonate will be found predominantly in the aquatic environment. In water, potassium hydrogencarbonate dissociates completely to K+ and inorganic carbon species. Both potassium and inorganic carbon are ubiquitously present in the environment. The concentrations of CO2, HCO3(-) and CO3(2-) in aquatic ecosystems according to the following equations:
CO2(solv) + H2O (<=> H2CO3(solv)) <=> HCO3(-)+ H(+) (pKa 1 = 6.35)
HCO3(-)<=> CO3(2 -)+ H(+) (pKa 2 = 10.33).
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 CO3(2-) 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. Atmospheric emissions as aerosols are rapidly neutralized by carbondioxide as occurs with other bases and the salts will be washed out by rain.
Biotic degradation
Biodegradation is not relevant because potassium carbonate is an inorganic substance.
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