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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
09.09. - 13.09.2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
GLP compliance:
not specified
Type of method:
flask method
Specific details on test material used for the study:
- Name of test material (as cited in study report): 1,1-dimethylurea
- Physical state: solid
- Expiration date of the lot/batch: 2015-12
Key result
Water solubility:
143.7 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
9.4

The result of the preliminary test

Sample weight0.1025 g

The result of the preliminary test is shown in Table 2.

Table 2    Result of pre-testfor water solubility

No.

Volume of water added/mL

Results

1

0.1

Not dissolved completely

2

0.5

Not dissolved completely

3

1

Dissolved completely

 

The test result

The test result is shown in Table 3. The mass concentrations of the threecentrifuging solutiongroups are separately1.428E-01 g/mL, 1.446E-01 g/mL and 1.438E-01 g/mL.

Table 3    The result of Water Solubility

No.

Solution

Mass taken (g)

pH at

20oC

Peak area

Average value of peak areas

Factor (f)

Average Value off

Mass concentration

(g/mL, 20oC)

1

STD1

0.04825

/

52.600

/

1.0912E+05

/

/

2

A

/

9.4

158.317

158.798

/

1.1124E+05

1.428E-01

3

159.278

4

STD2

0.02354

/

26.656

/

1.1335E+05

/

/

5

B

/

9.4

161.359

160.786

/

1.1123E+05

1.446E-01

6

160.213

7

STD1

0.04825

/

52.590

/

1.0910E+05

/

/

8

C

/

9.5

159.388

159.942

/

1.1119E+05

1.438E-01

9

160.495

10

STD2

0.02354

/

26.640

/

1.1328E+05

/

/

 

The relative difference of the concentrations measured in the three flasks respectively:

A-B-1.3 % A-C-0.8 % B-C0.5 % .


Discussion and evaluation of Test results

According to OECD 105:

-      The concentrations measured in the three flasksdid not differ by more than 15% each other, the test was satisfactory and the average value of all results could be calculated as the water solubility.

-      The last result of water solubility was the mean of the concentrations measured in the three flasks: [(1.428+1.446+1.438)×10-1/3] g/mL =/L, and pH = 9.4

Conclusions:
In a study according to OECD 105 the water solubility of 1,1-Dimethylurea was determined to be 143.1 g/L (20 °C, pH 9.4).
Executive summary:

In a study according to OECD 105 the water solubility of 1,1-Dimethylurea was determined to be 143.1 g/L (20 °C, pH 9.4).

Description of key information

In a study according to OECD 105 the water solubility of 1,1-Dimethylurea was determined to be 143.1 g/L (20 °C, pH 9.4).

Key value for chemical safety assessment

Water solubility:
143.7 g/L
at the temperature of:
20 °C

Additional information