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Diss Factsheets

Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
other: Hygroscopicity
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study was conducted using an appropriate test method, but not in compliance with GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report date:
2012

Materials and methods

Principles of method if other than guideline:
A known mass of the sample is exposed to air in an open vessel, and the increase in weight is monitored periodically until the weight comes to equilibrium.
GLP compliance:
no

Test material

Constituent 1
Reference substance name:
Reaction mass of ammonium iron(III) citrate and ammonium sulphate
EC Number:
932-833-9
IUPAC Name:
Reaction mass of ammonium iron(III) citrate and ammonium sulphate
Details on test material:
- Name of test material (as cited in study report): Ferric ammonium citrate, reaction mass with ammonium sulfate (FAC)

- Lot/batch No.: 071211

- Expiration date of the lot/batch: 2012-12-06

Results and discussion

Results:
A 4.3% increase in moisture absorption after about 32 hrs was obtained for the substance.

Any other information on results incl. tables

Sample weight increase from start

Time

Sample 1 (g)

Sample 2 (g)

Sample 3 (g)

30 mins

67.825

70.628

69.982

180 mins

67.835

70.638

69.993

2 hours

67.839

70.640

69.995

3 hours

67.844

70.647

70.001

4 hours

67.852

70.653

70.009

5 hours

67.856

70.661

70.014

6 hours

67.867

70.671

70.023

7 hours

67.871

70.676

70.029

8 hours

67.879

70.683

70.035

9 hours

67.886

70.689

70.041

10 hours

67.891

70.692

70.045

11 hours

67.897

70.698

70.050

12 hours

67.900

70.701

70.052

13 hours

67.903

70.705

70.056

14 hours

67.906

70.710

70.059

15 hours

67.912

70.713

70.063

16 hours

67.914

70.716

70.066

17 hours

67.916

70.716

70.067

18 hours

67.920

70.720

70.070

20 hours

67.934

70.734

70.081

22 hours

67.945

70.743

70.091

24 hours

67.951

70.750

70.098

26 hours

67.954

70.754

70.102

28 hours

67.96

70.761

70.106

30 hours

67.967

70.764

70.112

32 hours

67.968

70.767

70.114

34 hours

67.968

70.766

70.114

  

Sample percentage increase from start

 

Time

Sample 1 (%)

Sample 2 (%)

Sample 3 (%)

30 mins

0.09

0.12

0.06

180 mins

0.38

0.42

0.42

2 hours

0.50

0.47

0.48

3 hours

0.65

0.68

0.68

4 hours

0.88

0.8

0.93

5 hours

1.00

1.10

1.10

6 hours

1.32

1.39

1.39

7 hours

1.44

1.54

1.58

8 hours

1.68

1.75

1.77

9 hours

1.88

1.93

1.97

10 hours

2.03

2.02

2.0

11 hours

2.21

2.19

2.26

12 hours

2.30

2.28

2.32

13 hours

2.38

2.40

2.45

14 hours

2.47

2.55

2.55

15 hours

2.65

2.64

2.67

16 hours

2.71

2.73

2.77

17 hours

2.77

2.73

2.80

18 hours

2.88

2.85

2.90

20 hours

3.30

3.26

3.25

22 hours

3.62

3.53

3.58

24 hours

3.80

3.74

3.80

26 hours

3.88

3.85

3.93

28 hours

4.06

4.06

4.06

30 hours

4.27

4.15

4.25

32 hours

4.30

4.24

4.32

34 hours

4.30

4.21

4.32

Average

 

4.27

Applicant's summary and conclusion

Conclusions:
A 4.3% increase in moisture absorption was obtained for the substance after about 32 hrs.