4-acetyl-2-methylbenzoic acid

Surface tension

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:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

4-acetyl-2-methylbenzoic acid

EC Number:

856-079-4

Cas Number:

55860-35-0

Molecular formula:

C10H10O3

IUPAC Name:

4-acetyl-2-methylbenzoic acid

Test material form:

solid: particulate/powder

Results and discussion

Surface tension

Key result

Surface tension:

63.7 mN/m

Temp.:

20 °C

Conc.:

0.86 g/L

Remarks on result:

other: 90% of saturated solution

Any other information on results incl. tables

Results of the individual measurements

Test solution	Time (minutes)	Temperature (°C)	Reading (mN/m)
A	146	20.0	63.0
A	157	20.0	63.0
A	166	20.0	63.0
A	176	20.0	64.0
A	187	20.0	64.0
A	197	20.2	64.0
A	206	20.2	64.0
A	215	20.2	64.0
B	232	20.2	63.5
B	242	20.2	64.0
B	251	20.2	64.0
B	262	20.2	64.0
B	272	20.2	64.0

Applicant's summary and conclusion

Conclusions:

The average surface tension of duplicate 90% saturated solutions of the test substance in water has been determined to be 63.7 mN/m at 20 ± 0.5 °C.

Executive summary:

The surface tension was determined under GLP to OECD TG 115, using the ring method. The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements. The vessel, all glass ware and the ring necessary to perform the test were cleaned thoroughly before the main study.
For the test, two sample solutions were prepared by adding an aliquot of test substance (about 0.2 g) to 200 mL of high purity water, shaking the solution at 30 °C for 24 hours, then re-equilibrating at 20 °C for about 22 hours, centrifuging at 13000 rpm for 15 minutes and filtering through 0.45 μm filters. The isolated, saturated filtrate was then diluted to 90% of its former concentration with checked, in tolerance, high purity water. An aliquot of each sample solution was transferred to an individual measurement vessel and the surface tension was then measured. Since the surface tension of a solution in the measurement vessel may alter over a period of time, several measurements were made until a consistent value was obtained. The time elapsed since the solution was transferred to the measurement vessel was recorded for each value. The pH of each solution was measured.