1,3,3-trimethyl-2-[(methylphenylhydrazono)methyl]-3H-indolium 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:

June 20, 2018 - June 22, 2018

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:

no

Type of method:

OECD harmonised ring method

Key result

Surface tension:

< 60 mN/m

Temp.:

19.8 °C

Conc.:

1 012.8 mg/L

An aqueous solution of the test item in de-ionized water with a concentration of 1012.8 mg/l was prepared and stirred for about two days at room temperature. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ± 0.5 °C (19.8 °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 were within the limits of the stability criterion.

Table1: Surface tension

Measurement	1	2	3	4	5	6
Time (s)	135	255	375	497	618	740
s(mN/m) uncorrected	60.69	60.63	60.61	60.52	60.49	60.47
s(mN/m) corrected according to Zuidema and Waters[1]	55.32	55.26	55.24	55.14	55.12	55.10

Due to the fact that the surface tension showed a time-dependence no mean value could be reported. However, 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

Executive summary:

The surface tension of the aqueous solution at 20 °C was lower than 60 mN/m. The test item Basic Yellow 51 Chloride had surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C was lower than 60 mN/m. The test item Basic Yellow 51 Chloride had surface-active properties.