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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar (eco)toxicological properties because
• they share structural similarities with common functional groups: One quaternised ethanolamine moiety, one to three, mainly two ester groups with a typical UVCB distribution with long-chain fatty acids of natural origin. The molecular structure is almost identical.
• they are manufactured from similar resp. identical precursors (triethanolamine, long-chain fatty acids, dimethyl sulphate) under similar conditions. Therefore, common breakdown products via physical and biological processes, which result in structurally similar chemicals are evident
• A constant pattern in the changing of the potency of the properties across the TEA-Esterquats by chain-length and the grade of esterification is not observed, because the fatty acid chain-length distribution is too narrow and similar and the distribution of mono-, di-, and tri-esters is identical. Some variation caused by variation in C=C double bonds may occur and will be discussed at the relevant endpoint.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to chapter 13 of this IUCLID file.

3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to chapter 13 of this IUCLID file.

4. DATA MATRIX
See justification for read-across attached to chapter 13 of this IUCLID file.
Reason / purpose for cross-reference:
read-across: supporting information
Reason / purpose for cross-reference:
read-across source
Surface tension:
41.8 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Surface tension of partially unsaturated TEA-Esterquat at a test concentration of 1 g/L and 20°C

No.

Time (min)

sg

measured (mN/m)

sg x Fb=s*

1. correction

(mN/m)

f

(Harkins & Jordan)1

s* x f=s

2. correction

(mN/m)

1

0

41.5

43.3

0.9590

41.5

2

5

41.8

43.6

0.9594

41.8

3

10

41.8

43.6

0.9594

41.8

4

15

41.9

43.7

0.9596

41.9

5

20

41.9

43.7

0.9596

41.9

6

25

41.9

43.7

0.9596

41.9

Surface tension: mean (mN/m)

41.8

Std. Deviation: (mN/m)

0.15

% Std. Dev.

0.36

1) Correction factors according to Harkins & Jordan: f include a specific apparatus correction factor given by the company ‘Krüss, wissenschaftliche Laborgeräte, Germany’

The mean surface tension of an aqueous solution of 1 g/L partially unsaturated TEA-Esterquat was determined at 41.8 mN/m at 20°C. Because the test item shows a surface tension lower than 60 mN/m, the test item has surface active properties.

Conclusions:
The surface tension of the analogue source test substance "partially unsaturated TEA-Esterquat" was examined in a study conducted according to OECD Guideline 115 and EU-Method A.5 (ring method). The mean surface tension of an aqueous solution of 1 g/L AE 425/03 was determined at 41.8 mN/m at 20°C. Because the test item shows a surface tension lower than 60 mN/m, the test item has surface active properties.
Executive summary:

The surface tension of the analogue source test substance "partially unsaturated TEA-Esterquat" was examined in a study conducted according to OECD Guideline 115 and EU-Method A.5 (ring method). The mean surface tension of an aqueous solution of 1 g/L AE 425/03 was determined at 41.8 mN/m at 20°C. Because the test item shows a surface tension lower than 60 mN/m, the test item has surface active properties.

It can be expected that the study results are also applicable to the target substance Fatty acids, C18 unsatd., reaction products with triethanolamine, di-Me sulfate-quaternized.

Description of key information

Surface tension =41.8 mN/m at 20°C in a 1 g/L aqeueous solution.

Key value for chemical safety assessment

Surface tension:
41.8
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

No experimental data are available for the target substance oleic acid-based TEA-Esterquat. However, the surface tension was determined for the source substance partially unsaturated TEA-Esterquat. A justification for read-across is attached to Iuclid section 13.


 


The data are read across from partially unsaturated TEA-Esterquat which has an almost identical structure. The surface tension of partially unsaturated TEA-Esterquat was examined in a study conducted according to OECD Guideline 115 and EU-Method A.5 (ring method).The mean surface tension of an aqueous solution of 1 g/L partially unsaturated TEA-Esterquat was determined at 41.8 mN/m at 20°C. Because the test item shows a surface tension lower than 60 mN/m, the test item has surface active properties.