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Physical & Chemical properties

Surface tension

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Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
25 AUG 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Surface tension:
27 mN/m
Temp.:
20 °C
Conc.:
100 other: mg/dm³
Remarks on result:
other: = 90% of the saturation solubility in distilled water at 20 °C

Results

The calibration using demineralized water at 20 °C:

noof measurement

1

2

3

4

water surface tension value, mN/m

70.5

70.6

70.4

70.4

The detemined average value of demineralized water surface tension is: 70.5 +/- 0.1 mN/m

The calibration factor calculated is: 1.03

Measurement of surface tension of the test item solution in water (concentration of test item is 90% of the saturation solubility in distilled water, 100 mg/dm³) at 20 °C:

Measurement No

1

2

3

4

time of test item transfer to measurement vessel, min

5

15

30

45

test item surface tension, mN/m

28.0

28.1

27.8

28.2

The average value of test item surface tensiopn is: 28.0 +/- 0.2 mN/m

No distinct dependence of measured values of surface tension on the transfer time was observed. The measures surface tension value should be corrected by multiplying by the calibration factor 1.03 (calculated before).

Preliminary corrected value = 1.03 * 28.0 = 28.9 mN/m.

On the base of the polynomial equation (correction based on the values from EEC method A.5, OECD 115) the finally corrected value of the test item surface tension is:

σ= -1.183 + 0.946 · 28.9 + 9.927·10-4· (28.9)2= 27.0 mN/m

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
25 AUG 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Surface tension:
33.7 mN/m
Temp.:
20 °C
Conc.:
14 other: mg/dm³
Remarks on result:
other: = 90% of the saturation solubility in distilled water at 20 °C

Results

The calibration using demineralized water at 20 °C:

noof measurement

1

2

3

4

water surface tension value, mN/m

71.0

71.5

71.5

71.0

The detemined average value of demineralized water surface tension is: 71.3 +/- 0.3 mN/m

The calibration factor calculated is: 1.02

Measurement of surface tension of the test item solution in water (concentration of test item is 90% of the saturation solubility in distilled water, 14 mg/dm³) at 20 °C:

Measurement No

1

2

3

4

time of test item transfer to measurement vessel, min

15

30

40

55

test item surface tension, mN/m

34.5

34.6

35.0

35.2

The average value of test item surface tensiopn is: 34.8 +/- 0.3 mN/m

No distinct dependence of measured values of surface tension on the transfer time was observed. The measures surface tension value should be corrected by multiplying by the calibration factor 1.02 (calculated before).

Preliminary corrected value = 1.02 * 34.8 = 35.5 mN/m.

On the base of the polynomial equation (correction based on the values from EEC method A.5, OECD 115) the finally corrected value of the test item surface tension is:

σ= -1.183 + 0.946·35.5+ 9.927·10-4· (35.5)2= 33.7 mN/m

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
26 MAR 2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
according to guideline
Guideline:
other: DIN EN 14370
GLP compliance:
no
Type of method:
ring method
Surface tension:
28.57 mN/m
Temp.:
25 °C
Conc.:
19.6 mg/L
Surface tension:
41.46 mN/m
Temp.:
25 °C
Conc.:
0.98 mg/L

Results

Date / Operator

Solution A

Solution A

Solution B

Solution B

No of measurement

L0A028a5

L0A028a6

L0A028a3

L0A028a4

Date of measurement

2010-03-26

2010-03-26

2010-03-26

2010-03-26

Operator

Lertschak

Lertschak

Lertschak

Lertschak

 

 

 

 

 

Calibration

 

 

 

 

Calibration weight

500.1 mg

500.1 mg

500.1 mg

500.1 mg

Calibration value for force transducer cell (theory)

0.2183

0.2183

0.2183

0.2183

Calibration value for force transducer cell (experimental)

0.2182

0.2182

0.2182

0.2182

 

 

 

 

 

Measurement

 

 

 

 

Concentration (tel quel)

9.8 mg / 500 mL

9.8 mg / 500 mL

0.49 mg / 250 mL

0.49 mg / 250 mL

Total no of points

6

6

6

6

Standard deviation

0.46 mN/m

0.40 mN/m

0.24 mN/m

0.48 mN/m

Surface tension (Zuidema-Waters)

28.61 mN/m

28.52 mN/m

39.53 mN/m

43.38 mN/m

Average

28.57 mN/m

41.46 mN/m

Description of key information

28.57 mN/m at 25 °C, c = 19.6 mg/L (nominal)
41.46 mN/m at 25 °C, c = 0.98 mg/L (nominal)
27.0 mN/m at 20 °C, c = 100 mg/L (assumed 90% of saturation solubility)
33.7 mN/m at 20 °C, c = 14 mg/L (assumed 90% of saturation solubility)
Guidelines: DIN EN 14370, OECD 115, EU A.5

Key value for chemical safety assessment

Surface tension:
41.46
in mN/m at 20°C and concentration in mg/L:
0.98

Additional information

The data refer to measurements of substances of various single degrees of ethoxylation (EO = 2 and EO = 1). For a general ethoxylation degree of < 2.5 EO, a weight of evidence approach is applied. The substance is surface active. Since the determination of the water solubility is technically difficult and the recent most reliable determination according to OECD 105 (column elution method) results in the value of 1.3 mg/L at 20 °C, the concentration that corresponds to this value in the finest way is 0.98 mg/L. In the other cases an excess amount of the solute in each solution is suspected.