Copper, [29H,31H-phthalocyaninato(2-)-N29,N30,N31,N32]-, sulfonated

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 March 2017 - 18 July 2017

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)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

> 73.1 - < 73.7 other: dynes/cm

Temp.:

20 °C

Conc.:

500 other: mg

For the calibration difference between theoretical and experimental surface tension for the first series of test substance tests, the experimental value of 41.5 dynes/cm determined for the 500-mg weight was greater than the calculated value of 40.808 dynes/cm, resulting in a percent error of 1.70%. Taking into account the error of the weight, the results were not within the acceptance range of < 1%, and an additional calibration correction factor was needed:

F=S/Sa = F= 40.808 dynes/cm / 41.5 dynes/cm = 0.983 dynes/cm

The correction factor was factored into the determination of true surface tension.

Determination of the Surface Tension of Water: The experimental value of 73.7 dynes/cm determined for the distilled water compared well to the theoretical value of 72.75 dynes/cm, which yielded a percent difference of 1.34%. Since the experimental surface tension value of the distilled water was within 3% of the theoretical value, the instrument was verified to be operating correctly.

Determination of the Surface Tension of the Test Substance: The temperature during the definitive test ranged from 20.0 to 20.1°C. The true surface tension of the test substance was determined to be 73.4 ± 0.33 dynes/cm at 20.0°C as presented in the following table:

Replicate	Elapsed Time (min)	Apparent Surface Tension (dynes/cm)	Calibration Correction Factor	Instrument Correction Factor	True Surface Tension (dynes/cm)
1	7	79.5	0.983	0.935	73.1
	10	59.7	0.983	0.935	73.3
	14	80.1	0.983	0.935	73.7
2				MEAN	73.3
	6	80.1	0.983	0.935	73.7
	9	80.4	0.983	0.935	74.0
	16	79.9	0.983	0.935	73.5
3				MEAN	73.7
	5	79.6	0.983	0.935	73.2
	8	79.4	0.983	0.935	73.0
	13	79.7	0.983	0.935	73.3
MEAN					73.1
OVERALL MEAN					73.4±0.33

Since the surface tension was >60 dynes/cm, The test material is not considered to be surface active.

Conclusions:

The surface tension of the test substance, using OECD Guideline method 115, was 73.4 ± 0.3 dynes/cm at 20.0°C.

Executive summary:

The surface tension of the test substance, using OECD Guideline method 115, was 73.4 ± 0.3 dynes/cm at 20.0°C. Since the surface tension was >60 dynes/cm, the test substance is not considered to be surface active.

Description of key information

The surface tension of the test substance, using OECD Guideline method 115, was 73.4 ± 0.3 dynes/cm at 20.0°C.

Key value for chemical safety assessment

Surface tension:

73.4