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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Date of Inspection: 19-21/07/2011, Signed 31/08/2011 (MHRA)
Type of method:
air comparison pycnometer (for solids)
Remarks:
referred to as a 'gas comparison pyconometer' in the study report.
Type:
relative density
Density:
2.45
Temp.:
21.5 °C

RESULTS

 

Calibration

 

The pressure readings and the calculated volume for the reference and sample cells are shown in the following table:

Table 2.

Determination

P1

P2

P3

P4

Reference Cell Volume (cm3)

Sample Cell Volume (cm3)

1

17.168

6.496

17.786

8.807

90.737

149.068

2

17.693

6.696

17.819

8.824

90.793

149.111

3

17.695

6.679

17.829

8.821

90.041

148.509

 

Sample

The pressure readings, calculated volumes and density values obtained for the test item are shown in the following table:

Table 3.

Determination

Test

P1

P2

Volume (cm3)

Density

(kg/m3)

Mean Density (kg/m3)

1

A

17.741

7.318

19.964

2.45 x 103

2.45 x 103

B

17.713

7.307

19.980

2.45 x 103

C

17.855

7.365

19.963

2.46 x 103

2

A

17.870

7.422

21.465

2.43 x 103

2.45 x 103

B

17.295

7.180

21.369

2.45 x 103

C

17.168

7.126

21.330

2.45 x 103

 

Temperature: 21.5 ± 0.5 ºC

Mean density: 2.45 x 103kg/m3

Relative density: 2.45

Duplicate determinations were performed to ensure a reproducibility of less than ± 0.02 g/cm3 was obtained.

Conclusions:
The relative density of trisodium hydrogen diphosphate was determined to be 2.45 at 21.5 ± 0.5 ºC.
This study is considered to be appropriate and reliable for use as a key study in accordance with Regulation (EC) No. 1907/2006(REACH). No further testing is required.

Description of key information

One key study exists. This study (Woolley A, 2012) was conclusive, done to a valid guideline (EU Method A.3) and the study was conducted under GLP conditions. It is therefore scientifically justified for use as a key study under Regulation (EC) No. 1907/2006.

Key value for chemical safety assessment

Additional information

The relative density of the test item has been determined to be 2.45 at 21.5 ± 0.5°C.