Pyrolytic lignin

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

March 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2021

Report date:

2021

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

July 1995

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

OECD harmonised ring method

Test material

Test material information

Constituent 1

Reference substance name:

Low molecular weight organic substances from fast pyrolysis bio-oil

IUPAC Name:

Low molecular weight organic substances from fast pyrolysis bio-oil

Constituent 2

Reference substance name:

Monomers from fast pyrolysis bio-oil

IUPAC Name:

Monomers from fast pyrolysis bio-oil

Constituent 3

Reference substance name:

Dimers from fast pyrolysis bio-oil

IUPAC Name:

Dimers from fast pyrolysis bio-oil

Constituent 4

Reference substance name:

Trimers from fast pyrolysis bio-oil

IUPAC Name:

Trimers from fast pyrolysis bio-oil

Constituent 5

Reference substance name:

Higher oligomers from fast pyrolysis bio-oil

IUPAC Name:

Higher oligomers from fast pyrolysis bio-oil

Constituent 6

Reference substance name:

Water

EC Number:

231-791-2

EC Name:

Water

Cas Number:

7732-18-5

Molecular formula:

H2O

IUPAC Name:

water

Test material form:

liquid: viscous

Remarks:

Brown /black highly vicous liquid

Results and discussion

Surface tension

Key result

Surface tension:

>= 71.45 - <= 72.35 mN/m

Temp.:

19.9 °C

Conc.:

49.87 mg/L

Remarks on result:

other: As the determined surface tension was higher than 60 mN/m, the test item can be classified as not surface active

Any other information on results incl. tables

Measured Values Test Item First Series (6min after preparation of the sample)

 

Measurement	Time	Mass	Surface Tension	Temperature
No.	s	g	mN/m	°C
1	4.1	0.2966	72.35	19.9
2	5.1	0.2957	72.13	19.9
3	6.1	0.2956	72.11	19.9
4	7.1	0.2955	72.09	19.9
5	8.1	0.2955	72.09	19.9
6	9.1	0.2958	72.16	19.9
7	10.1	0.2954	72.06	19.9
8	11.1	0.2958	72.16	19.9
9	12.1	0.2954	72.06	19.9
10	13.1	0.2951	71.99	19.9
Mean			72.12
Standard Deviation			0.10

Measured Values Test Item Second Series (59 min after completion of the first series)

 

Measurement	Time	Mass	Surface Tension	Temperature
No.	s	g	mN/m	°C
1	4.2	0.2941	71.74	19.9
2	5.2	0.2932	71.53	19.9
3	6.2	0.2933	71.55	19.9
4	7.2	0.2949	71.94	19.9
5	8.2	0.2934	71.57	19.9
6	9.2	0.2930	71.48	19.9
7	10.2	0.2932	71.53	19.9
8	11.2	0.2930	71.48	19.9
9	12.2	0.2929	71.45	19.9
10	13.2	0.2929	71.45	19.9
Mean			71.57
Standard Deviation			0.16

 

After the first and second measurement series, the difference between mean values was less than 5% (0.76%). Therefore, no additional measurement series were required.

Applicant's summary and conclusion

Conclusions:

As the determined surface tension of test item was higher than 60 mN/m (between 71.45 and 72.35 mN/m), the test item can be classified as not surface active.

Executive summary:

The determination of the surface tension of the test material was conducted according to OECD 115 resp. EU A.5.

The surface tension of an aqueous solution of the test item was determined. Values ranging from 72.45 and 72.35 mN/m at 19.9 °C were recorded. One measurement was performed 6min after preperation and a second measurement, for verification, after 59 minutes. No significant changes and thus no significant dependence on time were observed. As these values were higher than 60 mN/m, test material was classified as not surface active.