1-ethyl-2-[1,2,3,4-tetrahydro-1-(2-hydroxyethyl)-2,2,4-trimethyl-6-quinolyl]benz[cd]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:

November 15, 2017 - November 16, 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

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:

58.85 mN/m

Temp.:

20 °C

Conc.:

1 089 mg/L

250.4 mg of the test item were put into 230 ml of demin. water and stirred at ambient temperature for 24 h. The test item was completely solved after the stirring period. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ±0.5°C (20.3 °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)	1240	1360	1481	1602	1723	1844
s(mN/m) uncorrected	62.40	62.34	62.28	62.22	62.17	62.12
s(mN/m) corrected according to Zuidema and Waters[1]	56.99	56.93	56.88	56.82	56.77	56.72

Mean value:   s= 56.85 mN/m (correctedaccording toZuidema and Waters¹)

The aqueous solution of the test item had a mean surface tension of 56.85 mN/m. 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

Executive summary:

The surface tension of the aqueous solution at 20 °C had a mean value of 56.85 mN/m. The test item had surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C had a mean value of 56.85 mN/m. The test item had surface-active properties.

Key value for chemical safety assessment

Surface tension:

56.85

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

1 089