Isobutyl phenylacetate

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

The study was conducted between 21 October 2014 and 4 December 2014.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2015

Report date:

2015

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

Isobutyl phenylacetate

EC Number:

203-007-9

EC Name:

Isobutyl phenylacetate

Cas Number:

102-13-6

Molecular formula:

C12H16O2

IUPAC Name:

isobutyl phenylacetate

Test material form:

liquid

Details on test material:

Identification: Isobutyl Phenyl Acetate
Chemical nature: 2-methylpropyl 2-phenylacetate
EC No.: 203-007-9
CAS No.: 102-13-6
Molecular weight: 192.2 g/mol
Appearance/physical description: clear, colourless liquid
Empirical formula: C12H16O2
Batch No: SC00010162
Purity: 100%

Results and discussion

Surface tension

Surface tension:

57.2 mN/m

Temp.:

20.5 °C

Conc.:

90 other: % of saturation concentration

Any other information on results incl. tables

The readings, times and temperatures for the sample solutions are shown in the following tables:

Sample A

Time (mins)	Reading (mN/m)	Temperature (°C)
95	56.5	21.0
120	56.5	20.6
130	56.5	20.6
145	57.0	20.6
155	57.0	20.4

Sample B

Time (mins)	Reading (mN/m)	Temperature (°C)
170	57.0	20.4
180	57.5	20.4
190	57.5	20.4
200	57.5	20.4
210	57.5	20.4

Mean Sample A result: 56.7 mN/m; pH of Sample A: 5.3

Mean Sample B result: 57.4 mN/m; pH of Sample B: 5.7

Overall result: 57.2 ±0.5 mN/m

Overall temperature: 20.5 ±0.5 ºC

Discussion: A platinum ring with a reduced circumference of 4 cm was used, whereas the guidelines specify 6 cm. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required reading accuracy (± 0.5 mN/m). This procedure with respect to the reduced ring dimensions has been considered not to have affected the integrity of the test.

 

According to criteria mentioned in Method A5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.

Applicant's summary and conclusion

Conclusions:

The mean surface tension of duplicate 90 % saturated solutions of test item in water has been determined to be 57.2 mN/m at 20.5 ± 0.5 °C. The test item was considered to be surface-active.

Executive summary:

The surface tension is 57.2 mN/m (90 % saturated solution) at 20.5 ± 0.5 °C, using a ring method, designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item was considered to be surface-active.