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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Scientifically valid and accepted method for measuring surface tension, quantification of uncertainty in result, tabulated data, surface tension of reference substance reported. However, not a guideline method, no time dependency reported, no surface tension reported at 1g/L or 20°C.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Based on the pending drop principle, which measures the volume of a drop detaching from a circule cross-section capillary. Details on instrumentail reported in Pineiro, A., et al, J. Chem. Thermodyn., 1999, 31, 931-942.
GLP compliance:
no
Type of method:
other: pending drop volume
Surface tension:
69.21 mN/m
Temp.:
25 °C
Conc.:
0.72 g/L
Remarks on result:
other: Averaged by registrant, n=2; concentration reported as mole fraction x=0.00013
Surface tension:
66.87 mN/m
Temp.:
25 °C
Conc.:
1.4 g/L
Remarks on result:
other: Averaged by registrant, n=2; concentration reported as mole fraction x=0.00026
Surface tension:
35.45 mN/m
Temp.:
25 °C
Conc.:
34 g/L
Remarks on result:
other: concentration reported as mole fraction x=0.0064

Mole fraction converted by the registrant using density=0.997021g/cm3 for x=0.00013 & x=0.00026, and density=0.99613g/cm3 for 0.0064).

Conclusions:
Scientifically valid and accepted method for measuring surface tension. The surface tension of the aqueous solution at 1.4g/L was >60mN/m, and is thus not considered surface active (criteria according to Regulation (EC) No. 440/2008, A.5).

Description of key information

66.87 mN/m, 25 °C, 1.4 g/L, pending drop volume, Bermudez 2011

Key value for chemical safety assessment

Additional information

One literature study reporting the surface tension of an aqueous solution at 1.4 g/L at 25 °C is available. The reported value of 66.87 mN/m is >60 mN/m, and thus does not meet the criteria for a surface active substance (criteria according to Regulation (EC) No. 440/2008, A.5).

The available data is considered relevant, reliable, and adequate for risk assessment and classification purposes. The endpoint is considered complete through the use of existing data, in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.1.1.