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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.