disodium 5-{4-chloro-6-[N-ethyl-3-(vinylsulfonyl)anilino]-1,3,5-triazin-2-ylamino}-4-hydroxy-3-[(4-vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate; reaction mass of: trisodium 5-{4-chloro-6-[N-ethyl-(3-(2-sulfonatooxy)ethylsulfonyl)anilino]-1,3,5-triazin-2-ylamino}-4-hydroxy-3-[4-(vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate; tetrasodium 5-{4-chloro-6-[N-ethyl-3-(2-(sulfonatooxy)ethylsulfonyl)anilino]-1,3,5-triazin-2-ylamino}-3-[4-(2-(sulfonatooxy)ethylsulfonyl)phenylazo]-4-hydroxynaphthalene-2,7-disulfonate; trisodium 5-{4-chloro-6-[N-ethyl-3-(vinylsulfonyl)anilino]-1,3,5-triazin-2-ylamino}-4-hydroxy-3-[4-(2-(sulfonatooxy)ethylsulfonyl)phenylazo]naphthalene-2,7-disulfonate

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)

Version / remarks:

adopted July 27, 1995

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

December 1992

GLP compliance:

yes

Type of method:

ring method

Key result

Surface tension:

62 mN/m

Temp.:

20 °C

Conc.:

1 003 mg/L

Remarks on result:

other: With a surface tension higher than 60 mN/m under the conditions of this method, the test item is regarded as not being surface active material.

The calibration factor ɸb was determined to be 1 .050 for double distilled water (Table 1).

The data are part of RCC's instruments' files and a copy is given in the raw data of the present study.

Table 2 shows the individual measurements for the surface tension of the aqueous test item solution. From these, the mean and the corrected value for the given solution were calculated and given in the same table. The tabulated values represent rounded results obtained from calculation using the exact raw data.

Table 1: Determination of the calibration Factor using water

Time expired [hours:min]	Temperature [°C]	Surface tension [mN/m]		Calibration factor    ɸb
		measured	mean value calculated from the bold values   δg
00:40	20.0	69.4	69.36	1.050
00:41	20.0	69.3
00:44	20.0	69.3
00:46	20.0	69.4
00:48	20.0	69.4

With:

ɸb = δo / δg

δo = the surface tension of water at the test temperature = 72.8000 mN/m at 20.0°C

δg = measurement value of the surface tension of the water at the test temperature

ɸb = calibration factor = 72.8000/69.36 = 1.050

Table 2: Determination of the Surface Tension of the Test ltem Solution

Time expired [hours:min]	Temperature [°C]	Surface tension [mN/m]
		measured	mean value calculated from the bold values (δ*)	corrected for calibration and for Harkins- Jordan (δ)
First sample			59.74	62.01
00:25	19.8	60.7
00:27	19.8	60.2
00:30	19.9	59.7
00:32	19.9	59.7
00:34	20.0	59.5
Second sample
00:37	20.1	59.7
00:38	20.1	59.7
00:39	20.1	59.4
00:41	20.2	59.4
00:42	20.2	59.4

With

δ* x ɸb = δ1 (59.74 x 1.0496 = 62.703)

ɸb = calibration factor = 1.0496

and

δ1 x Fc = δ (62.703 x 0.989 = 62.01)

Fc = factor for correction acc. to Harkins-Jordan = 0.989 for 62 mN/m

Conclusions:

The surface tension of Red Rwa 4565 in water (at a Concentration of about 0.1 %) was determined to be 62.0 mN/m at 20.0 °C ± 0.2 °C. Based on the criteria as outlined in the OECD Guideline, Red Rwa 4565 is not a surface active substance.

Executive summary:

The determination of the surface tension of an aqueous solution of Red Rwa 4565 was based on the OECD Guideline No. 115: "Surface Tension of Aqueous Solutions" (1995) and on the EEC Directive 92169, Part A, Methods for the determination of physico-chemical properties, 4.5 "surface tension", EEC Publication No. L383, December 1992.

The surface tension of Red Rwa 4565 in water (at a Concentration of about 0.1 %) was determined to be 62.0 mN/m at 20.0 °C ± 0.2 °C. Based on the criteria as outlined in the OECD Guideline, Red Rwa 4565 is not a surface active substance.

Description of key information

Surface tension of an aqueous solution of Red Rwa 4565 was determined according to OECD 115 and GLP.

Key value for chemical safety assessment

Surface tension:

62

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

1 003