2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methylbenzothiazolium methyl sulphate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached in IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Key result

Surface tension:

52.7 mN/m

Temp.:

20 °C

Conc.:

1 000 mg/L

Conclusions:

The surface tension of the aqueous solution of the substance (1000.0 mg/L) at 20 °C had a mean value of 52.7 mN/m. The test item had surface-active properties.

Executive summary:

The surface tension was measured according to OECD 115, based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid. A solution of the substance (1000.o mg/L) was prepared in de-ionized water, adapted to 20°C and carefully filled into the measurement vessel to avoid foaming. Once the measurement vessel was raised until the ring was immersed below the surface of the solution, 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 and corrected automatically according to Zuidema and Waters.

The measurements were repeated until 6 measurements were within the limits of the stability criterion (±0.1 mN/m) The individual results were averaged to give the final value

 σ= 52.7 mN/m (corrected according toZuidema and Waters¹). As the surface tension was lower than 60 mN/m, the test item had surface-active properties.

This information is used in a read-across approach in the assessment of the target substance.

For justification of read-across please refer to the attached read-across report (see IUCLID section 13).

Description of key information

The surface tension was measured according to OECD 115, based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid.

The surface tension of the aqueous solution of the substance (1000.0 mg/L) at 20 °C had a mean value of 52.7 mN/m. The test item had surface-active properties.

This information is used in a read-across approach in the assessment of the target substance.

For justification of read-across please refer to the attached read-across report (see IUCLID section 13).

Key value for chemical safety assessment

Surface tension:

52.7

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

1 000