Potassium phosphinate

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Guideline study with acceptable restrictions. Study performed according to guidelines but no precision on the type of method applied.

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

not specified

GLP compliance:

no

Remarks:

but under ISO 17025 : "testing laboratory for safety testing in the field of chemistry, protection against explosion and fire, electrostatic, storage, transport"

Type of method:

other: no data

Water solubility:

909 g/L

Temp.:

30 °C

pH:

>= 5.8 - <= 5.9

Details on results:

the result of 909 g/l is an average of 3 replicates at 30°C
- results sample 1: 890 g/L
- results sample 2: 969 g/L
- results sample 3: 868 g/L

Conclusions:

Interpretation of results (migrated information): very soluble (> 10000 mg/L)
In the test conditions, sodium hypophosphite is very soluble (909 g/L) at 30°C.

Executive summary:

Water solubility of sodium hypophosphite has been determined according to method A6 requirements from regulation (CE) n°440/2008 and OECD guideline 105.

The method applied was not cited. Measurements have been done in triplicate at the temperature of 30 °C and a pH between 5.8 and 5.9.

In the test conditions, sodium hypophosphite is very soluble (909 g/L). It is not expected that the water solubility is different at ambient temperature. (30°C)

As the study was performed according to guidelines but no precision on the type of method are given in the report, this study is considered as acceptable with restrictions.

Description of key information

Values from two studies on sodium phosphinate are available:
- 909 g/L at 30°C (5.8<pH<5.9) (EU method A6) (Reuse, 2009)
- 744 g/L at 20°C (flask method) (Besse, 1998)

In other words, sodium phosphinate is very soluble in water. By read-across, potassium phosphinate is also expected to be very soluble in water.

Key value for chemical safety assessment

Water solubility:

909 g/L

at the temperature of:

30 °C

Additional information

The experimental study of Reuse (2009) was chosen as the key study out of the two studies available as it is reliable without restrictions (Klimisch 2: guideline study with acceptable restrictions; no precision on the type of method applied). This study was performed according to method A6 requirements from regulation (CE) n°440/2008 and OECD guideline 105 under ISO 17025. In these test conditions, sodium hypophosphite is very soluble, 909 g/L at 30°C (5.8<pH<5.9) and it is not expected that the water solubility is different at ambient temperature.

 

The study of Besse (1998) was not a guideline study and solubility was assessed using the flask method. In the test conditions, sodium hypophosphite was very soluble at 20°C (i.e. 744 g/L). These results are considered as not assignable as documentation is insufficient for assessment.