Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: conducted to OECD/EC guidelines with GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2008
Report date:
2008

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Principles of method if other than guideline:
Deviation: The surface tension was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (+/- 0.5 mN/m); this is as a result of the reduced ring dimensions.
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Hydroxyphosponoaceic acid, trisodium salt (TK13061/2)
- Physical state: Solid (white powder)
- Lot/batch No.: LIC 613/04
- Storage condition of test material: Room temperature in the dark

Results and discussion

Surface tension
Surface tension:
71.5 mN/m
Temp.:
20 °C
Conc.:
0.999 g/L

Any other information on results incl. tables

Reading, times and temperatures for Trisodium [carboxy(oxido)methyl]phosphonate are shown in the following table:

Time (min) Reading (mN/m) Temperature (C )
65 71.5 19.8
75 71.0 19.8
85 71.0 19.8
95 71.0 19.8
105 71.0 19.8
115 72.0 20.0

mean reading: 71.3 mN/m

Surface tension = reading x calibration factor

= 71.3 x 1.004

= 71.5 mN/m

Applicant's summary and conclusion

Conclusions:
The surface tension of a 0.999 g/L solution of Trisodium [carboxy(oxido)methyl]phosphonate has been determined to be 71.5 mN/m at 20.0 +/- 0.5C. The test material is considered not to be a surface-active material.