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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
December 22th, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
adopted on 2 October 2012
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Type:
relative density
Density:
1.29
Temp.:
20 °C

DETERMINATION OF DENSITY OF TEST ITEM

Replication number Weight of test item (g) Volume of pycnometer (ml) Volume of wetting solution (ml) Density of test item (g/ml) Mean density (g/ml) ±SD RSD (%)
1 31.3124 50.0030 25.8525 1.2966 1.2942 0.003 0.23
2 30.0374 50.0093 26.7573 1.2918

SD = Standard Deviation, RSD = Relative Standard Deviation

Density of test item: 1.2942 g/ml

MEASUREMENTS

Determination of water equivalent and volume

Replication number Weight of empty pycnometer (x) (g) Weight of pycnometer with water (y) (g) Water equivalent weight (y-x) (g) Volume of the pycnometer at 20°C (ml)
V20= (y-x)/0.998 ml
1 42.8962 92.7992 49.9030 50.0030
2 43.1322 93.0415 49.9093 50.0093

Determination of density of wetting solution

Replication number Weight of empty pycnometer (x) (g) Weight of pycnometer with wetting solution (y) (g) Water of wetting solution (y-x) (g) Volume of the pycnometer at 20°C (ml) Density of wetting solution (g/ml)
1 42.8962 97.0048 54.1086 50.003 1.0821
2 43.1322 96.9868 53.8546 50.0093 1.0769

Determination of volume of wetting solution

Replication number Weight of empty pycnometer (x) (g) Weight of pycnometer with test item and wetting solution (y) (g) Weight of pycnometer with test item (g) Weight of test item (g) Volume of wetting solution (ml)
1 42.8962 102.1836 74.2086 31.3124 25.8525
2 43.1322 101.9845 73.1696 30.0374 26.7573
Conclusions:
Relative density: 1.29 at 20 °C
Executive summary:

The density of the test item was determined in accordance with OPPTS 830.7300 and OECD guideline 109.

The empty pycnometer, pycnometer with water, pycnometer with wetting solution, pycnometer with 2/3 of test item and pyknometer with 2/3 of test item and wetting solution were weighed and the weights were recorded to find out the water equivalent and the volume of the pycnometer. The density of the wetting solution, volume of wetting solution and density of the test item were calculated from the water equivalent and the volume of the pycnometer. The test was performed at 20 °C, under thermostatic conditions.

The density values resulted to be 1.2966 g/ml and 1.2918 g/ml for replicates R1 and R2, respectively; the calculated mean density value of the replicates was found to be 1.2942 ± 0.03 g/ml with 0.23 % of RSD.

The relative density resulted to be 1.29.

Conclusion

Relative density: 1.29 at 20 °C

Description of key information

Relative density: 1.29 at 20 °C

Key value for chemical safety assessment

Relative density at 20C:
1.29

Additional information

OECD 109 - Pycnometer method