Alkali metal tetrakis (perfluoro-alcoholato)metallate

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April - May 2020

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:

Method No. 109, adopted 02. Oct. 2012: “Density of Liquids and Solids “

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

pycnometer method

Specific details on test material used for the study:

Designation in Test Facility: 19110701G
Production date: 12. Aug. 2019
Date of Receipt: 07. Nov. 2019
Expiry date: 31. Oct. 2022

Dynamic viscosity of test material:

material is solid --> not applicable

Key result

Type:

relative density

Density:

1.99 other: dimensionless

Temp.:

20 °C

Remarks on result:

other: mean of duplicate measurements

Type:

density

Density:

1.99 g/cm³

Temp.:

20 °C

Findings

All measured values are given in the following table:

Table 1: Measured Values

First Determination
Weighing #	m1	m2	m3	m4	m5
Item	Pycn. empty	Pycn.+ H2O	Pycn. + repl.liq.	Pycn. + test item	Pycn. + test item + repl. liq.
Mass in g	32.5565	57.5786	52.4539	37.5690	55.4668
Temperature in °C	19.8	20.2	20.2	20.0	20.4
Second Determination
Weighing #	m1	m2	m3	m4	m5
Item	Pycn. empty	Pycn.+ H2O	Pycn. + repl.liq.	Pycn. + test item	Pycn. + test item + repl. liq.
Mass in g	32.5566	57.5784	52.4537	37.7597	55.5810
Temperature in °C	20.2	20.2	20.2	20.0	20.2

Pycn. = Pycnometer; repl. liq.= replacement liquid

 

Calculation of Results

Density of Test Item

The Density ρ of the test item was calculated as follows:

ρs _= ((m4-m1))/((m3-m1 )-(m5-m4))*ρ_(repl.)

with

ρs = density of solid test item in g/cm³

m1 = mass of empty pycnometer in g

m3 = mass of pycnometer with replacement liquid in g

m4 = mass of pycnometer with solid test item in g

m5 = mass of pycnometer with replacement liquid and test item in g

ρrepl. = density of replacement liquid in g/cm³

The relative density of the test item has the same number value, but no unit, assuming that relative density is given as the ratio of test item density to density of water at 4 °C, having a standard density of 0.999975 g/cm³ (source: CRC Handbook of Chemistry and Physics - 90th edition / Section 6 - Fluid properties - p.6 - 7).

 

The density of the replacement liquid is: ρrepl. = (m3-m1)/(m2-m1 )*ρH2O

with

ρrepl. = density of replacement liquid in g/cm³

m1 = mass of empty pycnometer in g

m2 = mass of pycnometer with water in g

m3 = mass of pycnometer with replacement liquid in g

ρH2O = density of water at test temperature (0.9982 g/cm³ at 20.0 °C)

 

Density of water was determined at 20.2 °C as 0.9981652 g/cm³ (N.B. Vargaftik, et al., International tables of the surface tension of water, J .Phys.Chem.Ref. Data, 12,817,1983)

 

Calculation of Error

The relative error of the method was calculated from:

Δρ = 2* Δm*100%/m4-m1 + 4* Δm*100%/(m3-m1)-(m5-m4) + 2* Δm*100%/m3-m1 + 2* Δm*100%/m2-m1

with

Δρ = relative error of the measured density

Δm = absolute error of single weighing (0.0003 g)

 

Calculation of Relative Standard Deviation RSD was done as follows: RSD = sd*100/density(mean)

with

RSD = Relative Standard Deviation in %

sd = Standard Deviation in g/cm³

 

The following values were calculated.

Table 2:

First Determination			Error rel.	Error abs.
Temperature	20.2	°C		0.1
Density of water	0.9981652	g/cm^3	2.00%	0,0002
Volume of Pycnometer	25.0681	cm^3
Density of Replacement Liquid	0.7937	g/cm^3
Density of Test Item	1.9897	g/cm^3	0.0774%	0.0015
Second Determination			Error rel.	Error abs.
Temperature	20.2	°C		0.1
Density of water	0.9981652	g/cm^3	2.00%	0.0002
Volume of Pycnometer	25.0678	cm^3
Density of Replacement Liquid	0.7937	g/cm^3		.
Density of Test Item	1.9895	g/cm^3	0.0748%	0.0015

rel. = relative; abs. = absolute

 

Presentation of Results: Results of the single determinations with the respective error as well as the mean value and its standard deviation are presented in the following tables:

Table 3: Results of Single Determinations

Determination	Density in g/cm³	Error of Determ. in g/cm³
1	1.9897	0.0015
2	1.9895	0.0015

 

Table 4: Results – Mean Values

Parameter	Value	Unit	Standard Deviation	Relative Standard Deviation
Volume of Pycnometer	25.07	cm³	0.0002	0.00%
Density of Test Item	1.9896	g/cm³	0.0001	0.01%
Density of Test Item	1989.6	kg/m³	0.1	0.01%
Relative Density of Test Item	1.9896		0.0001	0.01%

Note: All calculations are performed with unrounded values. Therefore, re-calculation with rounded values may lead to slightly different results.

The density of the test item AM(pfa)4 was calculated as 1.9896 ±0.0015 g/cm³ at 20.0 ±0.4 °C, which is the mean of two values. Precision of the value is given as maximal error of a single determination. The standard deviation of the two values is much lower than the maximal error of a single determination, indicating that the error of the determination was lower than the calculated value. Correspondence of the values is very good. Therefore, the study is considered valid.

Conclusions:

The density of the test item AM(pfa)4 was found being 1.9896 ±0.0015 g/cm³ at 20.0 ±0.4 °C.

Executive summary:

Using the pycnometer method, a density of 1.9896 ±0.0015 g/cm³ at 20.0 ±0.4 °C was measured. This value is the mean of two independent determinations with the maximum error of a single determination. Standard deviation was 0.0001 g/cm³, showing very good correlation of the two determinations. Thus, the experiment was considered valid.

Description of key information

Using the pycnometer method, a density of 1.9896 ±0.0015 g/cm³ at 20.0 ±0.4 °C was measured. This value is the mean of two independent determinations with the maximum error of a single determination. Standard deviation was 0.0001 g/cm³, showing very good correlation of the two determinations. Thus, the experiment was considered valid.

Key value for chemical safety assessment

Relative density at 20C:

1.99