Registration Dossier
Registration Dossier
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EC number: 206-059-0 | CAS number: 298-14-6
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Potassium hydrogencarbonate is not expected to have an intrinsic toxic activity to terrestrial microorganisms.
Key value for chemical safety assessment
Additional information
The dissociation of potassium hydrogencarbonate in water and soil pore water results in the formation of potassium and carbonate ions. Potassium as well as carbonate is ubiquitously present in the environment, occurring naturally in minerals, soils and sediments, natural waters (oceans, lakes, rivers), biota and human beings and also in sewage. Relevant sources for their occurrence in soil are decay of biotic material, animal and human excreta and abrasion of pedospheric and lithogenic material. Therefore, potassium hydrogencarbonate and its abiotic dissociation products are common constituents of soil and not expected to have an intrinsic toxic activity to soil microorganisms.
According to COMMISSION DIRECTIVE 2008/127/EC of 18 December 2008 amending Council Directive 91/414/EEC to include several active substances, potassium hydrogencarbonate is included in Annex I as a fungicide. Evaluation of biocides is not in the scope of the REACH Regulation. KHCO3 is used as contact fungicide in spray application on leaves for some crops. Its mode of action is linked with osmotic pressure, pH and some specific bicarbonate/carbonate ion effects. Potassium input resulting from use as a fungicide is considerably smaller than the potassium need of the crop. Therefore, potassium hydrogencarbonate is not expected to have an intrinsic toxic activity to terrestrial microorganisms.
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