Dodecyltrimethylammonium bromide

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 2018-05-23 to 2019-

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Key result

Water solubility:

> 954 000 mg/L

Conc. based on:

test mat.

Incubation duration:

>= 24 - <= 72 h

Temp.:

20 °C

pH:

>= 4.3 - <= 4.6

Preliminary test

The solubility of the test item in water at room temperature was estimated to be > 64.8 g/L and < 172.8 g/L. Therefore, the flask method was performed.

Table 2: Preliminary test for the water solubility

Amount of test item [mg]	Total volume of added water [mL]	Ultrasonic bath [min]	Remark
103.65	0.1	--	not dissolved
	0.6	1	not dissolved
	1.6	2	dissolved

 

Main test

For the main test three flasks were prepared with an amount of test item and water, and one flask only with water. After 24, 48 and 72 h at 30 °C and further 24 h at 20 °C the mixtures could not be stirred anymore because clear jellylike masses were formed. Since no homogenization of the mass could be assured, no analytical measurements of the masses were performed.

In the main test, about 47.7 g of the test item could be dissolved in 50 mL water (954 g/L). This amount formed a jellylike mass, which could not be stirred anymore.

Conclusions:

The water solubility at 20 °C of the test item could be estimated to be: cS > 954 g/L (954000 mg/L).

Executive summary:

The water solubility was determined according to OECD 105 and Regulation (EC) No. 440/2008 method A.6 using the shake flask method with HPLC analysis. About 47 g test item were weighed into 100 mL glass-stoppered Erlenmeyer flasks (three parallels) according to the estimated solubility based on the preliminary test. After the addition of 50 mL double distilled water, the flasks were stirred at 30 °C for 24, 48 and 72 hours.After stirring at 30 °C the flasks were cooled down to 20 °C and stirred at 20 °C for another 24 h. After this time no remaining solid could be observed in the flasks. The mixture of test item and water was jellylike and could not be stirred anymore. Thus, the centrifugation and subsequent analytical determination (HPLC analysis) of the concentration were inapplicable.The pH of each sample was recorded. The water solubility of the test substance was determined to be 954 g/L at 20 °C (pH = 4.3 – 4.6).

Description of key information

The water solubility of the test item is 954 g/L at 20 °C.

Key value for chemical safety assessment

Water solubility:

954 g/L

at the temperature of:

20 °C

Additional information

The water solubility was determined according to OECD 105 and Regulation (EC) No. 440/2008 method A.6 using the shake flask method with HPLC analysis. About 47 g test item were weighed into 100 mL glass-stoppered Erlenmeyer flasks (three parallels) according to the estimated solubility based on the preliminary test. After the addition of 50 mL double distilled water, the flasks were stirred at 30 °C for 24, 48 and 72 hours. After stirring at 30 °C the flasks were cooled down to 20 °C and stirred at 20 °C for another 24 h. After this time no remaining solid could be observed in the flasks. The mixture of test item and water was jellylike and could not be stirred anymore. Thus, the centrifugation and subsequent analytical determination (HPLC analysis) of the concentration were inapplicable.The pH of each sample was recorded. The water solubility of the test substance was determined to be 954 g/L at 20 °C (pH = 4.3 – 4.6) (reference 4.8-1).