Ammonium undecafluorohexanoate

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Remarks:

For ammonium perfluorohexanoate (AmPFHX) as CMC (critical micelle concentration)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

no guideline followed

Principles of method if other than guideline:

CMC by Surface Tension (ring method) vs. Concentration

GLP compliance:

no

Type of method:

other: CMC by Surface Tension (ring method) vs. Concentration

Water solubility:

174 other: mmol / dm3, same as mmol/L

Conc. based on:

test mat.

Temp.:

20 °C

Remarks on result:

other: Water solubility is based on CMC.

Remarks:

(174 mmol/L = 57,610 mg/L)

RESULTS

The individual surface tension and concentration results are summarized in the table below. These data were used to create the plot of Surface Tension vs. Concentration; using this plot, the resulting Critical Micelle Concentration (CMC) of APFHx (C-1500N) was determined to be 174 mmol / dm³(182 mmol / kg) at 20 °C.

Molality, m (mmol / kg)	Density, ρ    (g / cm^3)	Molarity, c (mmol / dm^3)	Run #	Max. force (mgf)	Correction Factor, F	Surface Tension (mN/m)
40.5	1.008	40.3	1	646.8	0.9182	48.9
			2	646.6	0.9182	48.8
			Average	-	-	48.8
69.4	1.014	68.8	1	554.3	0.9078	41.4
			2	554.0	0.9078	41.4
			Average	-	-	41.4
125	1.025	123	1	443.6	0.8926	32.6
			2	443.2	0.8926	32.5
			Average	-	-	32.6
357	1.066	341	1	357.0	0.8759	25.7
			2	357.0	0.8759	25.7
			Average	-	-	25.7
1088	1.138	911	1	333.3	0.8671	23.8
			2	333.1	0.8671	23.8
			Average	-	-	23.8
2998	1.291	1942	1	304.7	0.8526	21.4
			2	304.8	0.8526	21.4
			Average	-	-	21.4

Notes:

Density (ρ) is measured using pycnometer method.

Molarity, c, is calculated from molality (m) and density (ρ) using equation below.

  c = (1000*m*ρ) / (1000 + m*M) where M = MW of sample (331.08)

Correction Factor is determined according to Appendix in report.

Accuracy of surface tension result is ± 0.1 to 0.2 mN / m.

Description of key information

Water solubility at 20 ºC is 174 mmol/L (57.61 g/L) as CMC (Critical Micelle Concentration) determined by surface tension vs. concentration.

Key value for chemical safety assessment

Water solubility:

57.61 g/L

at the temperature of:

20 °C

Additional information

Supporting study for Perfluorohexanoic Acid (PFHxA), CAS 307-24-4:

Water solubility at 20 °C is > 250 g/L (OECD 105, flask method), final pH = 0.6.