Cesium tungsten oxide

Density

Administrative data

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 Dec 2016 - 15 Feb 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

adopted in 2008

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

adopted in 2012

GLP compliance:

yes (incl. QA statement)

Remarks:

Department of Health, London, UK

Type of method:

air comparison pycnometer (for solids)

Test material

Test material information

Constituent 1

Test material form:

solid: nanoform, no surface treatment

Results and discussion

Density

Type:

relative density

Density:

6.74 other: dimensionless

Temp.:

20 °C

Any other information on results incl. tables

Calibration

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

Table

Determination	P1 [psig]	P2 [psig]	P3 [psig]	P4 [psig]	Reference Cell Volume [cm^3]	Sample Cell Volume [cm^3]
1	17.230	6.525	17.687	8.760	90.997	149.291
2	17.895	6.779	17.167	8.501	91.171	149.500
3	17.934	6.796	17.538	8.684	91.323	149.670

 

Mean reference cell volume: 91.164 cm³

Mean sample cell volume: 149.487 cm³

 

Sample

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

Table

Determination	Test	P1(sample)[psig]	P2(sample)[psig]	Volume [cm^3]	Density [kg/m^3]	Mean Density [kg/m^3]
1	A	17.541	6.901	8.930	7.04 x 10^3	6.78 x 10^3
1	B	17.155	6.758	9.234	6.81 x 10^3	6.78 x 10^3
1	C	17.953	7.074	9.287	6.77 x 10^3	6.78 x 10^3
2	A	17.554	6.924	9.529	6.90 x 10^3	6.69 x 10^3
2	B	17.180	6.786	9.853	6.67 x 10^3	6.69 x 10^3
2	C	17.078	6.744	9.794	6.71 x 10^3	6.69 x 10^3

 

Mean density: 6.74 x 10³ kg/m³

Relative density: 6.74

Temperature: 20.0 ± 1.0 °C

Discussion 

For each of the test item determinations, reading “A” has been excluded from calculations due to a systematically lower apparent sample volume. This was attributed to possible incomplete purging/penetration of the helium gas within the sample during the first pressurization cycle. Less than 1% variance was then observed between the following “B” and “C” pressurizations and consequent volume calculations for each of the duplicate determinations.

As the reference cell volume and sample cell volume were within the defined tolerance (90.953 ± 1.0 cm³ and 149.225 ± 1.0 cm³ for the reference and sample cell volumes respectively) the gas comparison pycnometer was therefore considered acceptable for use.

Applicant's summary and conclusion

Conclusions:

The Relative density of the substance was found to be 6.74.

Executive summary:

The relative density of the substance was determined using an OECD TG 109 methodology using a gas comparison pycnometer. Triplicate pressure readings were taken on 2 different smaples. 

The relative density was found to be 6.74.