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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis at
pH 4, 50°C, 120h: < 10% (OECD guideline 111)
pH 7, 50°C, 120h: < 10% (OECD guideline 111)
pH 9, 50°C, 120h: < 10% (OECD guideline 111)
Therefore, the estimated half-life time is higher than one year under representative environmental conditions (25 °C) and sodium hypophosphite (solid) is considered to be hydrolytically stable.

Key value for chemical safety assessment

Additional information

The study of Habeck (2009) was chosen as key study since it is reliable without restriction (Klimisch 1; GLP guideline study). Hydrolysis as function of pH of sodium hypophosphite (solid) was determined according to OECD guideline 111 under GLP procedure. A preliminary study at pH 4.0, 7.0 and 9.0 and at a temperature of 50°C measured the concentration of the test substance before the test and after 2.4 hours and 120 hours (5 days) of incubation under no direct light and avoiding oxygen. 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%.

The estimated half-life time is higher than one year under representative environmental conditions. Therefore, sodium hypophosphite (solid) is considered to be hydrolytically stable.