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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability in water:

The hydrolysis of sodium hypophosphite (solid) as function of pH was determined according to OECD guideline 111 under GLP procedure. The test was performed at a temperature of 50°C and at pH 4.0, 7.0 and 9.0 and the total duration of the test was 120 hours (5 days). Under these conditions no significant degradation of sodium hypophosphite (solid) was observed at 50 °C for all tested pH-values. After 5 days the hydrolysis of sodium hypophosphite (solid) was less than 10%. Thus, the estimated half-life time is higher than one year under representative environmental conditions (25 °C) and sodium hypophosphite (solid) is considered hydrolytically stable.

Hence, sodium hypophosphite (solid) is expected to be persistent in the aquatic compartment.