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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
Justification:

The substance is inorganic, therefore biodegradation does not apply. Data from literature demonstrate the biological transformation (oxidation) of phosphite into phosphate in soil. Various microorganisms are able to utilize phosphite as phosphorous source.

Nevertheless other sources related to PPP reports a DT50 soil of 157 days. The substance could be considered persistent (DT50>120) but not very persistent (DT50>180). Further tests are in course for verification.

Mono- and di-potassium salts of phosphorous acid are insoluble in octanol which, therefore, suggests that it would not bioaccumulate in fish or other animals. The substance is not toxic; as a conclusion it can be stated that the substance is not PBT