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Diss Factsheets

Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01 March 2011
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
Principles of method if other than guideline:
The determination was carried out using a gas comparison pycnometer, designed to be compatible with Method A3 Relative Density of Commission Regulation (EC) No 440/2008 of 30 May 2008.
GLP compliance:
yes (incl. QA statement)
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
2.75
Temp.:
21.7 °C
Remarks on result:
other: +/- 0.5 degC

Apparatus

Instrument:                    Quantachrome Multi Pycnometer

Calibration Sphere:       A stainless steel sphere with a calibrated known volume (Vcal= 56.559 cm3)

Gas:                              Helium

Principle of the Test

A sample cell of known volume was partially filled with an accurately weighed amount of the test item. The sample cell was filled with an inert gas at ambient pressure. A reference cell of known volume was pressurized with the inert gas and the pressure recorded. The two cells were then connected, and after equilibration, the resulting pressure was recorded.

The test item volume was calculated from the two pressure readings, assuming that the inert gas exhibits ideal gas behaviour. The density of the test item was then calculated from the known mass and the determined volume.

Procedure

Calibration

A reference cell with the defined volume (Vref) was pressurised to a typical pressure in the range 16 to 20 psi and the pressure recorded (P1). Following this, the volume of the sample cell was added to the system, resulting in a reduction in pressure, which was also recorded (P2). The volume calibration of the reference cell and the sample cell was confirmed using the calibration sphere (Vcal). The test procedure as outlined was repeated with the sample cell containing the calibration sphere (pressure readings P3and P4for the upper and lower pressure values, respectively).

From these four pressure readings, the volume of the reference cell (Vref) and the sample cell (Vcell) were calculated. The calibration was performed at least on each day of measurement. The temperature was monitored and recorded.

Both procedures were performed in triplicate.

Sample

Aliquots (see following table) of test item were weighed into the sample cell and placed into the pycnometer.

Table 1

Determination

Mass Taken (g)

A

28.7726

B

33.3758

Triplicate pressure readings (P1(sample)and P2(sample)) were taken after pressurising the reference cell of known volume (Vref) and then switching to the sample cell (Vcell).

Conclusions:
The relative density of the test item has been determined to be 2.75 at 21.7 ± 0.5°C.

Description of key information

Relative density: 2.75 at 21.7 +/- 0.5°C (EU Method A.3, GLP)
    
    
    
    
    
    

± 0.5°C

Key value for chemical safety assessment

Relative density at 20C:
2.75

Additional information

The relative density of iron orthophosphate was determined according to EU Method A.3 and GLP using the gas comparisation method (Walker, 2011). The density was determined to be 2.75 at 21.7 ± 0.5°C.