1-[2-(2-chloroethoxy)phenylsulfonyl]-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)urea;triasulfuron (ISO)

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 Nov 2010 to 19 Nov 2010

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:

Jul 1995

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

Dec 1992

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

63.9 mN/m

Temp.:

20.3 °C

Conc.:

90 other: % of saturated concentration

The calibration factor Φb was determined to be 1.0203 for double distilled water.

Table 1 Determination of the Calibration Factor Using Water

Time expired [hours:min]	Temperature [°C]	Surface tension [mN/m]		Calibration factor Φb
		measured	mean value calculated from the bold values σg
00:31	19.7	71.5	71.4	1.0203
00:32	19.7	71.4
00:33	19.7	71.4
00:35	19.7	71.3
00:36	19.7	71.3
00:37	19.7	71.2

with

σo = 72.795 mN/m at 19.7 °C

Φb = σo / σg

Φb = 72.795 / 71.35 = 1.0203

where

Φb = calibration factor

σo = the surface tension of water at the test temperature

σg = measured value of the surface tension of water at the test temperature

 

Table 2 Determination of Surface Tension for the Test substance

Time expired [hours:min]	Temperature [°C]	Surface tension [mN/m]
		measured [mN/m]	mean value calculated from the bold values (σ*)	mean value corrected for calibration (σ1)	σ1 corrected for Harkins- Jordan (σ)
First sample
0:33	20.4	62.8	62.73	64.00	63.43
0:35	20.4	62.8
0:36	20.4	62.7
0:37	20.4	62.7
0:38	20.4	62.7
0:39	20.4	62.7
Second sample
0:32	20.2	63.7	63.67	64.96	64.40
0:33	20.2	63.6
0:34	20.2	63.6
0:35	20.2	63.7
0:36	20.2	63.7
0:37	20.2	63.7

Mean value from both samples: σ = 63.9 mN/m
with
σ* · Φb = σ1
Φb = calibration factor = 1.0203
and
σ1 · Fc = σ
Fc = factor for correction acc. to Harkins-Jordan
= 0.991 for 64.00 mN/m and 0.991 for 64.96 mN/m

 

Conclusions:

The average surface tension of two independent measurements was 63.9 mN/m for a 90 % aqueous solution at 20.3 ± 0.1 °C. The substance is considered not surface active.

Executive summary:

The surface tension of the test substance was determined using the ring method in accordance with OECD TG 115 following GLP principles. The average surface tension of two independent measurements was 63.9 mN/m for a 90% aqueous solution at 20.3 ± 0.1 °C. The substance is considered not surface active.

Description of key information

Surface tension: 63.9 mN/m for a 90% aqueous solution at 20.3 ± 0.1 °C, not surface-active substance, OECD TG 115, ring method, Kühne 2010

Key value for chemical safety assessment

Surface tension:

63.9