5-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-2,7-disulphonic acid, sodium salt

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

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

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

OECD harmonised ring method

Surface tension:

52.8 mN/m

Temp.:

20 °C

Conc.:

1 g/L

An aqueous solution of the test item in de-ionized water with a concentration of 1,000.5 mg/L was prepared, stirred for 24 hours at room temperature and the solution was adapted to the measurement temperature for 30 minutes. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ±0.5 °C (20.1 °C), as follows:

 

The solution to be measured is 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 table 1 and figure 1). 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 a constant surface tension value in 6 measurements is reached.

Table 1: Measured surface tensions

Measurement	1	2	3	4	5	6
Time (s)	778	840	901	963	1025	1087
s(mN/m) uncorrected	58.26	58.22	58.14	58.10	58.05	58.01
s(mN/m) corrected by Zuidema and Waters [1]	52.95	52.91	52.84	52.78	52.74	52.70

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

The test item has a mean surface tension of 52.8 mN/m. As the surface tension is lower than 60 mN/m, the test item has surface-active properties.

Conclusions:

The surface tension of the aqueous solution at 20 °C has a mean value of 52.8mN/m.
The test item has surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C has a mean value of 52.8 mN/m. The test item has surface-active properties.

Key value for chemical safety assessment

Surface tension:

52.8

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

1 000

Additional information

An aqueous solution of the test item in de-ionized water with a concentration of 1000.5 mg/L was prepared, stirred for 24 hours at room temperature and the solution was adapted to the measurement temperature for 30 minutes. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ± 0.5°C (20.1 °C).

The test item has a mean surface tension of 52.8 mN/m. As the surface tension is lower than 60 mN/m, the test item has surface-active properties.