mecoprop-P (ISO); (R)-2-(4-chloro-2-methylphenoxy)propionic acid

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 February 1999 to 22 June 1999

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

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes

Type of method:

OECD harmonised ring method

Key result

Surface tension:

50 mN/m

Temp.:

20 °C

Conc.:

90 vol%

Surface Tension

Time (Minutes)	Surface Tension (mN/m)
	Measured		Calibration Corrected
	A	B	A	B
0	51.5	52.5	52.0	53.0
10	52.0	52.5	52.5	53.0
20	52.0	52.5	52.5	53.0
30	51.5	52.5	53.0	53.0

 

From the results there was no apparent time dependence of surface tension after transfer to the measuring vessel.

Overall mean calibration corrected surface tension = 52.5 mN/m

Harkins-Jordan corrected value = 50.0 mN/m

Conclusions:

Under the conditions of the study the surface tension of a 90 % saturated solution of the test material was found to be 50.0 mN/m. As the result is less than 60 mN/m, the test material is considered to be surface active.

Executive summary:

The surface tension of the test material was assessed according to OECD Test Guideline 115 EU Method A.5. and in compliance with GLP using the OECD harmonized ring method.

Test material (approximately 79.2 mg) was dissolved in purified water (100 mL) to give a 90 % saturated aqueous solution.

A second solution was prepared in a similar manner.

The test vessel was half filled with liquid, put on the tensiometer test platform, and raised so that the ring was 2 - 3 mm below the liquid surface. The platform was lowered to draw a lamella from the liquid surface. The maximum force which arose just before the lamella was torn off is the surface tension and was recorded. Measurements were made at intervals until a constant value (to within 0.5 mN/m) was recorded. The room temperature was monitored throughout the test.

From the results there was no apparent time dependence of surface tension after transfer to the measuring vessel.

Under the conditions of the study the surface tension of a 90 % saturated solution of the test material was found to be 50.0 mN/m. As the result is less than 60 mN/m, the test material (pure grade) is considered to be surface active.

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

12 September 1994

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Qualifier:

according to guideline

Guideline:

other: DIN 53914

Deviations:

not specified

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

51.4 mN/m

Temp.:

20 °C

Conc.:

0.5 other: % (w/w)

Key result

Surface tension:

51.6 mN/m

Temp.:

20 °C

Conc.:

2 other: % (w/w)

Surface tension: 51.4mN/m with a 0.5 % concentration of the test material (w/w in pure water).

Surface tension: 51.6mN/m with a 2% concentration of the test material (w/w in pure water).

Conclusions:

Under the conditions of the study the surface tension of 0.5 % and 2 % (w/w in pure water) concentrations of the test material were 51.4mN/m and 51.6mN/m respectively.

Executive summary:

The surface tension of the test material was assessed according to DIN 53914 and in compliance with GLP using the ring method of Lecomte du Nouy.

Under the conditions of the study the surface tension of 0.5 % and 2 % (w/w in pure water) concentrations of the test material were 51.4mN/m and 51.6mN/m respectively.

Description of key information

Comb (2000b)

Under the conditions of the study the surface tension of a 90 % saturated solution of the test material was found to be 50.0 mN/m. As the result is less than 60 mN/m, the test material (pure grade) is considered to be surface active.

Supporting Study: Kröhl (1994)

Under the conditions of the study the surface tension of 0.5 % and 2 % (w/w in pure water) concentrations of the test material were 51.4mN/m and 51.6mN/m respectively.

Key value for chemical safety assessment

Surface tension:

50

Additional information

Comb (2000b)

The surface tension of the test material was assessed according to OECD Test Guideline 115 EU Method A.5. and in compliance with GLP using the OECD harmonised ring method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Test material (approximately 79.2 mg) was dissolved in purified water (100 mL) to give a 90 % saturated aqueous solution.

A second solution was prepared in a similar manner.

The test vessel was half filled with liquid, put on the tensiometer test platform, and raised so that the ring was 2 - 3 mm below the liquid surface. The platform was lowered to draw a lamella from the liquid surface. The maximum force which arose just before the lamella was torn off is the surface tension and was recorded. Measurements were made at intervals until a constant value (to within 0.5 mN/m) was recorded. The room temperature was monitored throughout the test.

From the results there was no apparent time dependence of surface tension after transfer to the measuring vessel.

Under the conditions of the study the surface tension of a 90 % saturated solution of the test material was found to be 50.0 mN/m. As the result is less than 60 mN/m, the test material (pure grade) is considered to be surface active.

Supporting Study: Kröhl (1994)

The surface tension of the test material was assessed according to DIN 53914 and in compliance with GLP using the ring method of Lecomte du Nouy. The study was awarded a reliability score of 2 in accordance with the criteria set forth by Klimisch et al. (1997).

Under the conditions of the study the surface tension of 0.5 % and 2 % (w/w in pure water) concentrations of the test material were 51.4mN/m and 51.6mN/m respectively.