[2-[[4-[(2-chloro-4-nitrophenyl)azo]phenyl]ethylamino]ethyl](2-hydroxypropyl)dimethylammonium chloride

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July 22, 2015 - July 23, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: guideline study (EU A.5, OECD 115)

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

not applicable

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

not applicable

GLP compliance:

no

Key result

Surface tension:

< 60 mN/m

Temp.:

20 °C

Conc.:

1 050 mg/L

Remarks on result:

other: The surface tension showed a time-dependence. Thus, no mean value could be reported.

 

Individual results

An aqueous solution of the test item in de-ionized water with a concentration of 1050 mg/lwas prepared and stirred overnight. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ± 0.5 °C (20.0 °C), as follows:

The solution to be measured was transferred to the measurement vessel, taking care to avoid foaming. The measurement vessel was placed on the table of the test apparatus. The measurement vessel was raised until the ring was immersed below the surface of the solution. The time from starting the measurement was recorded (see Table1 below). Subsequently, the table top was lowered gradually and evenly at a rate of 0.3 cm/min to detach the ring from the surface until the maximum force was reached. The force was read on the tensiometer. The measurements were repeated until 6 measurements werewithin the limits of the stability criterion.

Table1: Surface tension

Measurement	1	2	3	4	5	6
Time (s)	822	883	944	1004	1065	1126
σ (mN/m) uncorrected	61.99	61.91	61.86	61.81	61.76	61.71
σ (mN/m) corrected by Zuidema and Waters[1]	56.59	56.51	56.46	56.41	56.36	56.32

Due to the fact that the surface tension showed a time-dependence no mean value could be reported. However as the surface tension was lower than 60 mN/m the test item had surface-active properties.

[1]Zuidema, H., Waters, C.W.,Ind. Eng.Chem. Analyt.13 (1941), S. 312

Conclusions:

The surface tension of the aqueous solution at 20 °C was lower than 60 mN/m. The test item had surface-active properties.

Executive summary:

The purpose of this study was the determination of the surface active properties of the test item according to EU A.5 and OECD test guideline 115. The surface tension of the aqueous solution of the test item (c = 1050 mg/L) at 20 °C was lower than 60 mN/m. Thus, it can be concluded that the test item has surface-active properties.

Description of key information

The surface tension of an aqueous solution of the test item (c = 1050 mg/L) at 20 °C was determined in accordance with methods EU A.5 and OECD 115. Measurements resulted in surface tension values of below 60 mN/m. Thus, it can be concluded that the test item has surface-active properties.

Key value for chemical safety assessment

Surface tension:

56

in mN/m at 20°C and concentration in mg/L:

1 050