N,N-Dimethyl-9-dodecenamide

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 - 17 January 2022

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Principles of method if other than guideline:

An adaptation of the standard method was performed taking into account the findings of Letinski, D.J., Connolly, M.J., Peterson, D.R. and Parkerton, T.F. (2002) “Slow-stir water solubility measurements of selected alcohols and diesters”, Chemosphere 48, 257-265.

GLP compliance:

yes (incl. QA statement)

Type of method:

other: slow-stirring method

Water solubility:

117.5 mg/L

Conc. based on:

act. ingr.

Loading of aqueous phase:

1 g/L

Incubation duration:

>= 1 - <= 10 d

Temp.:

20 °C

pH:

5

Preliminary test:

A preliminary test was carried out as a range finding test prior to the main test. The concentration range obtained gives an indication on the necessary analytical method sensitivity.

Increasing volumes of water were added at room temperature to 20.7 mg of the test item in a 100 mL flask. After each addition of an amount of water, the mixture was shaken and visually checked for any undissolved parts of the sample.

The approximate solubility deduced from the necessary volume of pure water in which complete dissolution of the sample occurred is given in the table below.

Volume of water added	Solubilisation?	Approximate solubility
1 mL	NO	-
10 mL	NO	-
100 mL	NO	< 197 mg/L

Main test:

The following table presents the concentrations (in mg/L) obtained during the study for the vessel 1 in ultrapure water.

Sampling date (y/m/d)	Stirring duration (day)	Rep. 1	Rep. 2	Mean
2022/01/17 10:00 (Preparation T0)	0	-	-	-
2022/01/18 10:00	1	101.0	132.0	116.5
2022/01/19 10:00	2	104.2	106.3	105.3
2022/01/20 8:40	3	155.4	141.7	148.6
2022/01/21 8:30	4	116.8	130.0	123.4
2022/01/24 8:30	7	120.0	109.5	114.8
2022/01/25 8:30	8	113.3	117.8	115.6
2022/01/26 9:00	9	104.4	122.2	113.3
2022/01/27 8:30	10	120.3	117.3	118.8

Sampling in vessels 2 and 3 occurred 10 days after their preparation. The concentrations measured (in mg/L) for these two vessels were:

	Rep. 1	Rep. 2	Mean
Vessel 2	129.8	107.4	118.6
Vessel 3	115.1	121.5	118.3

The pH controlled with the indicator strips for each specimen was 5 (in all vessels).

The temperature variations were included in the range 19.8°C - 20.3°C.

The equilibrium concentrations for each vessels were:

-       115.6 mg/L for vessel 1;

-       118.6 mg/L for vessel 2;

-       118.3 mg/L for vessel 3.

The maximum difference observed between the three determinations is 3%, which proves that an acceptable repeatability is obtained (the OECD 105 acceptability criterion for the maximum difference is 15% for the shake flask method).

Validity criteria:

The study was considered as valid since:

the equilibrium was demonstrated on vessel 1 (maximum equilibration time: 15 days);

the equilibrium concentrations determined for the three vessels did not differ by more than 15%;

the pH variation did not exceed 2 pH units in each vessel.

Executive summary:

A study was performed to assess the water solubility of the test item N,N-dimethyl dodec-9-enamide by the slow-stirring method adapted from OECD TG 105 and EU Method A.6 according to the findings of Letinski et al (2002).

Three determinations in ultrapure water were carried out. 280 µL of the test item were carefully poured at the top of 250 mL of water thermostated at 20 ± 0.5 °C (corresponding to a loading rate of approximately 1 g/L). The solutions were allowed to equilibrate 24 hours before starting the sampling and up to 10 days. The test item concentrations were monitored by GC-FID.

The solubility of N,N-dimethyl dodec-9-enamide in water at 20±0.5 °C, based on three determinations with the slow-stirring method was 117.5 ± 1.4 mg/L

Description of key information

The water solubility was determined to be 117.5 ± 1.4 mg/L at 20±0.5 °C using a slow-stirring method adapted from OECD TG 105 and EU Method A.6 according to the findings of Letinski et al (2002).

Key value for chemical safety assessment

Water solubility:

117.5 mg/L

at the temperature of:

20 °C