imidacloprid (ISO); 1-(6-chloropyridin-3-ylmethyl)-N-nitroimidazolidin-2-ylidenamine

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 Aug 2015

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, Energie, Landwirtschaft und Verbraucherschutz, Mainzer Straße 80, D65189 Wiesbaden

Type of method:

OECD harmonised ring method

Surface tension:

72 mN/m

Temp.:

20 °C

Conc.:

530.5 mg/L

Remarks on result:

other: mean value of measured surface tension from two solutions with concentrations 530 mg/L and 531 mg/L (determined by HPLC)

Individual results of the measurement of the surface tension:

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 age of the test solutions at the beginning of the measurement was 27 hours 23 minutes for the first test solution and 26 hours 51 minutes for the second test solution. 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.

Measured data:

	Experiment 1		Experiment 2
	Time [s]	σM [mN/m]	Time [s]	σM [mN/m]
1. measurement	79.0	70.32	76.1	70.99
2. measurement	120.3	70.18	122.8	70.93
3. measurement	164.9	70.14	165.9	70.92
4. measurement	207.9	70.08	209.3	70.86
5. measurement	250.4	70.07	251.8	70.86
6. measurement	296.0	70.03	298.0	70.87
7. measurement	339.2	70.04	339.4	70.90
8. measurement	382.9	70.00	382.8	70.87
9. measurement	427.5	70.01	427.9	70.85
10. measurement	470.1	69.98	471.3	70.86
Mean  σM [mN/m]	70.09		70.89

Mean (experiments 1 to 2): σ_mean = 70.49 mN/m

Standard deviation: 0.57 mN/m

Relative standard deviation: 0.8 %

The mean value, multiplied by the calibration factor (F= 1.0219) results in:

σ =  σ_meanx F = 72.0 mN/m

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2-3 Jun 1993

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

GLP compliance:

yes

Type of method:

ring method

Surface tension:

72.2 mN/m

Temp.:

19.8 °C

Conc.:

458.91 mg/L

Remarks on result:

other: after ca. 30 min - mean of last 3 measured values

Description of key information

72 mN/m at 20 °C, concentration 530.5 mg/L (ca. 90% saturated concentration in water)(OECD 115, EU A.5, OECD harmonised ring method)

The substance is not surface active.

Key value for chemical safety assessment

Surface tension:

72

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

530.5

Additional information

In an earlier experiment (OECD 115, ring method), resulting in the value of 72.2 mN/m at 19.8 °C, concentration 458.91 mg/L, it was confirmed that the substance was not surface active.