N,N-Dimethyl-9-dodecenamide

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

7 - 18 February 2022

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 123 (Partition Coefficient (1-Octanol / Water), Slow-Stirring Method)

Qualifier:

according to guideline

Guideline:

EU Method A.23 Partition Coefficient (1-Octanol/Water): Slow-Stirring Method

GLP compliance:

yes (incl. QA statement)

Type of method:

slow-stirring method

Partition coefficient type:

octanol-water

Analytical method:

gas chromatography

Type:

log Pow

Partition coefficient:

4.26

Temp.:

25 °C

pH:

5

Main test results:

The concentrations (in mg/L) measured in both phases and the corresponding log P_OW are presented in the following table:

	Vessel 1			Vessel 2			Vessel 3
Sampling date (m/d/y h:min)	Cwater	Coct	log POW	Cwater	Coct	log POW	Cwater	Coct	log POW
2/8/22 8:30	1.22	21407	4.24	-	-	-	-	-	-
2/8/22 13:45	1.16	26707	4.36	-	-	-	-	-	-
2/9/22 8:00	1.13	21379	4.28	-	-	-	-	-	-
2/9/22 14:00	1.33	20582	4.19	-	-	-	-	-	-
2/10/22 8:00	1.21	21995	4.26	1.51	24752	4.21	1.53	28619	4.27
2/10/22 14:00	1.61	24913	4.19	1.53	25543	4.22	1.74	30627	4.25
2/11/22 8:00	1.37	24434	4.25	1.23	24383	4.30	1.39	26528	4.28
2/11/22 14:00	1.50	26198	4.24	1.32	25376	4.28	1.32	24284	4.26

The temperature variations were included in the range 24.7 – 25.2 °C.

log P_OW calculation:

The following table presents the log P_OW for each vessel and their corresponding statistical weights:

	log Pow,i	wi
Vessel 1	4.24	1034
Vessel 2	4.25	511
Vessel 3	4.27	6000

The average log P_OWis: log P_OW= 4.26 ± 0.008.

           

Mass balance calculation:

The mass balance in each system can be calculated knowing the measured concentration in both phases at the equilibrium state and the introduced amount of test item.

The average mass balances between February 10at 8:00 and February 11 at 14:00for each vessel are presented below:

Sampling date	Vessel 1	Vessel 2	Vessel 3
2/10/22 8:00	102.7%	115.5%	133.6%
2/10/22 14:00	116.3%	119.2%	142.9%
2/11/22 8:00	114.0%	113.8%	123.8%
2/11/22 14:00	122.3%	118.4%	113.3%
Mean	113.8%	116.7%	128.4%

Validity criteria of the study:

The study was considered as valid since:

-  the equilibrium was demonstrated for the three vessels after 5 days of equilibrium ;

- the total test item loss was inferior to 50 %.

Executive summary:

A study was performed to assess the partition coefficient of the test item N,N-dimethyldodec-9-enamide by the slow-stirring method according to OECD TG 123 and EU Method A.23.

Three determinations were carried out at 25 ± 0.5 °C. 50 mL of octanol saturated with water containing the test item were equilibrated with 650 mL of ultrapure water saturated by octanol. The concentration of the test item in octanol was to 22.5 g/L. Equilibrium was obtained when the observed log Pow reached a plateau. The test item concentrations were monitored in both phases by GC-FID.

The partition coefficient of N,N-dimethyldodec-9-enamide at 25 ± 0.5 °C, based on three determinations with the slow-stirring method was 4.26 ± 0.008.

Description of key information

The log Pow was determined to be 4.26 ± 0.008 at 25 ± 0.5 °C using a slow-stirring method according to OECD TG 123 and EU Method A.23.

Key value for chemical safety assessment

Log Kow (Log Pow):

4.26

at the temperature of:

25 °C