thiacloprid (ISO);(Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide;{(2Z)-3-[(6-chloropyridin-3-yl)methyl]-1,3-thiazolidin-2-ylidene}cyanamide

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

17-24 Oct 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)

Qualifier:

according to guideline

Guideline:

EU Method A.8 (Partition Coefficient - Shake Flask Method)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7550 (Partition Coefficient, n-octanol / H2O, Shake Flask Method)

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium fur Umwelt, ländlichen Raum und Verbraucherschutz, Wiesbaden, Germany

Type of method:

flask method

Partition coefficient type:

octanol-water

Analytical method:

high-performance liquid chromatography

Type:

log Pow

Partition coefficient:

1.3

Temp.:

24 °C

pH:

4

Type:

log Pow

Partition coefficient:

1.4

Temp.:

24 °C

pH:

7

Type:

log Pow

Partition coefficient:

1.3

Temp.:

24 °C

pH:

9

Individual results pH 4:

Experiment:	1A	1B	2A	2B	3A	3B
Phase ratio 1-octanol : aqueous phase	1 : 2	1 : 2	1 : 1	1 : 1	2 : 1	2 : 1
Volume of the 1-octanol phase [mL]	5	5	10	10	20	20
Volume of the aqueous phase [mL]	10	10	10	10	10	10
Concentration in the 1-octanol phase [mg/L]*	923	921	486	486	249	249
Concentration in the aqueous phase [mg/L]*	45	45	24	24	12	12
Mass balance [mg]	5.07	5.06	5.10	5.10	5.10	5.10
Mass balance [%]	104	104	104	104	104	104
pH of the aqueous phase	4.05	4.05	4.04	4.05	4.04	4.04

*rounded values

Partition coefficients at pH 4:

Exp.	Pow*	Average Pow	SD	RSD [%]	Log Pow
1A 1B	21 20	20	0.03	0.2	1.31
2A 2B	20 20	20	0.0	0.0	1.31
3A 3B	21 21	21	0.0	0.0	1.32
Average Pow		Pow*=20	0.25	1.2

* rounded values

Individual results pH 7:

Experiment:	1A	1B	2A	2B	3A	3B
Phase ratio 1-octanol : aqueous phase	1 : 2	1 : 2	1 : 1	1 : 1	2 : 1	2 : 1
Volume of the 1-octanol phase [mL]	5	5	10	10	20	20
Volume of the aqueous phase [mL]	10	10	10	10	10	10
Concentration in the 1-octanol phase [mg/L]*	905	908	477	475	244	251
Concentration in the aqueous phase [mg/L]*	40	40	21	21	11	11
Mass balance [mg]	4.93	4.94	4.98	4.98	4.99	5.13
Mass balance [%]	103	103	104	103	104	107
pH of the aqueous phase	6.98	6.98	6.98	6.98	6.98	6.98

* rounded values

Partition coefficients at pH 7:

Exp.	Pow*	Average Pow	SD	RSD [%]	Log Pow
1A 1B	23 23	23	0.05	0.2	1.36
2A 2B	23 23	23	0.07	0.3	1.36
3A 3B	22 23	23	0.45	2.0	1.35
Average Pow		Pow* = 23	0.10	0.4

* rounded values

Individual results pH 9:

Experiment:	1A	1B	2A	2B	3A	3B
Phase ratio 1-octanol : aqueous phase	1 : 2	1 : 2	1 : 1	1 : 1	2 : 1	2 : 1
Volume of the 1-octanol phase [mL]	5	5	10	10	20	20
Volume of the aqueous phase [mL]	10	10	10	10	10	10
Concentration in the 1-octanol phase [mg/L]*	809	825	434	425	240	240
Concentration in the aqueous phase [mg/L]*	39	39	21	20	10	11
Mass balance [mg]	4.44	4.52	4.55	4.45	4.90	4.91
Mass balance [%]	98	100	100	98	108	108
pH of the aqueous phase	9.08	9.07	9.09	9.09	9.11	9.11

* rounded values

Partition coefficients at pH 9:

Exp.	Pow*	Average Pow	SD	RSD [%]	Log Pow
1A 1B	21 21	21	0.29	1.4	1.32
2A 2B	21 21	21	0.41	2.0	1.32
3A 3B	24 22	23	1.54	6.7	1.36
Average Pow		Pow* = 22	1.13	5.2

* rounded values

Description of key information

log Pow 1.4 at 24 °C, pH 7

log Pow 1.3 at 24 °C, pH 4 and 9

Key value for chemical safety assessment

Log Kow (Log Pow):

1.4

at the temperature of:

24 °C

Additional information

The partition coefficient of the substance was determined according to OECD 107 and EU A.8 (flask method).