clothianidin (ISO); (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13-14 May 2014

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)

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Landwirtschaft und Forsten, Wiesbaden, Germany

Type of method:

OECD harmonised ring method

Surface tension:

71.4 mN/m

Temp.:

20 °C

Conc.:

90 other: % of saturated concentration

Calibration of the tensiometer with distilled water:

A calibration of the apparatus was carried out using bi-distilled water at 20 °C. The surface tension was determined to be 72.01 mN/m (mean value of 10 measurements). The calibration factor F, defined as the ratio (literature value)/(determined value), was 1.0103.

Individual results:

The surface tension values of the two diluted aqueous solutions of the test item were determined. The measurement was carried out at 20 °C ± 0.5 °C. A correction factor (Harkins & Jordan) is included.
The concentrations of the two solutions were determined by HPLC analyses (results: 262 mg/L for experiment A, and 296 mg/L for experiment B).

The age of the test solutions at the beginning of the measurement was 27.5 hours for the first test solution (A) and 29.0 hours for the second test solution (B). The age of the test solution is defined as the period of time from the preparation of the solution to the recording of the surface tension value.

Measurement no.	Experiment A		Experiment B
	Time (s)	ST(mN/m)	Time (s)	ST(mN/m)
1	80.1	70.98	80.1	70.92
2	123.9	70.82	126.1	70.76
3	169.0	70.75	169.5	70.70
4	212.5	70.69	215.9	70.62
5	257.4	70.65	262.3	70.59
6	301.6	70.60	306.4	70.57
7	345.6	70.68	345.6	70.55
8	393.5	70.58	393.5	70.53
9	437.9	70.57	437.9	70.55
10	484.8	70.56	484.8	70.54
Mean	-	70.69	-	70.63

Mean of two experiments: 70.66 mN/m, SD = 0.04 mN/m, RSD = 0.1%

Mean multiplied by the calibration factor F: 71.4 mN/m

The substance is not surface active.

Description of key information

71.4 mN/m at 20 °C, 90% saturation conc. in water

Additional information

The experiment was performed according to guidelines OECD 115 and EU A.5 (OECD harmonized ring method). The substance is not surface active.