Registration Dossier
Registration Dossier
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EC number: 237-066-7 | CAS number: 13598-36-2
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Potassium phosphite (KH2PO3) caused no enzyme inhibition on the microflora from arable soil/mud flat soil (North Seashore) mixture. Dose rates were > 840 and > 60 mg/kg soil dw. This cannot be converted to a concentration in water.
Key value for chemical safety assessment
Additional information
The effect of phosphite on the biocoenosis of an arable soil was investigated in a field trial. The response of soil micro-organisms was studied. After application of phosphite in the form of KH2PO3, combined with mud-flat soil, to the upper layer of a grass grown plot, an adaptation of the metabolic acitvity of the active soil biocoenosis caused at least a partly oxidation of phosphite to phosphate.
Microbial enzyme activities demonstrated no significant correlation to soil contents of phosphite and phosphate with exception of dehydrogenase (correlated to phosphate).
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