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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 September 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes
Type of method:
pycnometer method
Specific details on test material used for the study:
- Batch n°: DR74271215
- Production release date: 30 November 2015
- Expiry date: 30 December 2018
- Purity (on dry basis): 98.2%, water content: 0.05%
Key result
Type:
relative density
Density:
0.908 other: dimensionless
Temp.:
20 °C

Determining the Density of the Immersion Liquid

 Mass of Empty Pycnometer (g)  24.21  Volume of Pycnometer (ml)  25.7
 Mass water & Pycnometer (g)  49.84  Density of Water (g/cm³) (ρw,t)  0.998
 Mass of IL & Pycnometer (g)  49.01  Mass IL in Pycnometer (g) (m1)  24.80
 Calculated Density of IL (g/cm³)  0.965  Density of IL (kg/m³)  965

Equation 1 (Calculation for the density of water)

Mass of water / volume of pycnometer = Density of water

Equation 2 (Calculation for the density of immersion liquid)

ρIL = m1/mw x ρw,t Where : m1 is the mass of the immersion liquid; mw is the mass of water; ρw,t is the density of water at temperature t

Calculated value for the density of immersion liquid = 965 kg.m-3 @ 20°C

Determining the Density of the Sample

 Run Number  1    2
 Mass of Empty Pycnometer (g)  24.21    24.21
 Mass of Sample & Pycnometer (g)  47.55    47.52
 Mass of Sample added to empty Pycnometer (g) ms  23.34    23.31
 Mass of Sample, Pycnometer & immersion liquid  47.55    47.52
 Mass of immersion liquid added (g) m2  0.00    0.00
 Calculated Density of Sample (g/cm3)  0.909    0.907
 Density of Sample (kg/m3)  909    907
 Mean Result (kg.m-3)    908  

Equation 3 (Calculation for the density of the sample)

ρS,t = ms ρIL/ (m1 – m2)

Where: ms is the mass, in grams, of the sample;

m1 is the mass, in grams, of immersion liquid required to fill the empty pycnometer;

m2 is the mass, in grams of immersion liquid added to fill the pycnometer containing the sample;

ρIL is the density of the immersion liquid (as determined by equation 2)

Conclusions:
The relative density of the test item was determined to be 0.908. The sample density is 908 kg/m³ at 20°C.

Description of key information

The relative density of the substance was determined using the pycnometer method and was found to be 0.908 at 20°C (density: 908 kg/m³) in a test according to OECD guideline 109 and EU Method A.3 without deviations (K1, Dekra, 2017).

Key value for chemical safety assessment

Relative density at 20C:
0.908

Additional information