1,4-Dihydroxy-2,2,6,6-tetramethylpiperidine

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Principles of method if other than guideline:

The surface tension result 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

Key result

Surface tension:

63.6 mN/m

Temp.:

21.5 °C

Conc.:

1.1 g/L

Remarks on result:

other: The sample solution pH was 8.1. At this pH the substance oxidises. It should be noted that the surface tension measurement might in part have been carried out on the oxidation product, even though the water used was purged with nitrogen to minimise oxygen

Results

Calibration factor

The readings, temperatures and the corresponding calibration factors for glass double-distilled water are shown in the attached background information

Conclusions:

The surface tension of a 1.10 g/L solution of test item in water has been determined to be 63.6 mN/m at 21.5 ± 0.5 °C. The test item was considered not to be surface-active.

Executive summary:

Surface Tension Method

The determination was carried out using a White Electrical Institute interfacial tension balance using a procedure designed to be compatible with Method A5 Surface Tension of Commission Directive 92/69/EEC.

          

Discussion

The sample solution pH was 8.1. At this pH the substance oxidises. It should therefore be noted that the surface tension measurement might in part have been carried out on the oxidation product, even though the water used in the test was purged with nitrogen to minimise any oxygen present

     

Conclusion

The surface tension of a 1.10g/l solution of test item in water has been determined to be 63.6 mN/m at 21.5 ± 0.5 °C. The test item was considered not to be surface active.

Description of key information

The surface tension of a 1.10g/l solution of test item in water has been determined to be 63.6 mN/m at 21.5 ± 0.5 °C. 

Key value for chemical safety assessment

Surface tension:

63.6

in mN/m at 20°C and concentration in mg/L:

1.1

Additional information

Surface Tension Method

The determination was carried out using a White Electrical Institute interfacial tension balance using a procedure designed to be compatible with Method A5 Surface Tension of Commission Directive 92/69/EEC.

          

Discussion

The sample solution pH was 8.1. At this pH the substance oxidises. It should therefore be noted that the surface tension measurement might in part have been carried out on the oxidation product, even though the water used in the test was purged with nitrogen to minimise any oxygen present

     

Conclusion

The surface tension of a 1.10g/l solution of test item in water has been determined to be 63.6 mN/m at 21.5 ± 0.5 °C. The test item was considered not to be surface active.