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Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-04-06
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
no
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
1.92 other: unitless
Temp.:
21 °C

Results:

Calibration:

The pressure readings (P1and P2) and the calculated volume for the calibration ball are shown in the following table:

Determination

P1

P2

Volume (cm3)

Certified Volume (cm3)

Tolerance

(cm3)

A

17.391

8.615

56.6

56.6

± 0.5

B

17.416

8.625

56.5

56.6

± 0.5

Sample

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

Determination

P1

P2

Volume (cm3)

Density

(kg/m3)

A

17.446

6.906

10.412

1940.3

B

17.013

6.752

11.004

1908.2

Temperature:            21.0 ± 0.5ºC
Mean density:                       1924.2 kg/m3
Relative density:                   1.92

 

Conclusions:
The relative density of the test item has been determined to be 1.92 at 21.0 ± 0.5°C using a relevant test method. The result is considered to be reliable.
Executive summary:

The relative density was determined to be 1.92 at 21.0 ± 0.5°C, using a gas comparison pycnoter, designed to be compatible with Method A3 Relative Density of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Description of key information

Relative density (solid form): 1.92 at 21.0 ± 0.5°C (EU Method A.3) determined in a reliable study.

Specific gravity (commercial solutions): ca. 1.16 g/cm³ at 20°C

Key value for chemical safety assessment

Relative density at 20C:
1.92

Additional information

A relative density value of 1.92 at 21.0 ± 0.5°C was determined for the solid form of HEDP (2-3Na) using a gas comparison pycnometer method in accordance with EU Method A.3. The result is considered to be reliable and is selected as key study.

In available secondary sources 1.16 g/cm³ is reported for the commercial solutions (aqueous) of HEDP (2 -3Na).