Potassium pentahydrogen bis(phosphate)

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03/08/2009

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

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

22/11/2005

Type of method:

air comparison pycnometer (for solids)

Type:

relative density

Density:

2.119 g/cm³

Temp.:

20 °C

Remarks on result:

other: Temperature is reported as 20±0.7°C

Table 1 - Determination of the Density of Potassium pentahydrogen bis(phosphate)

Measurement	Temperature [°C]	Sample cell (empty) [g]	Sample cell (filled) [g]	Amount of test item [g]	Pressure p1^1 [psi]	Pressure p2^1 [psi]	Sample volume^2 [cm^3]	Density [g/cm^3]
1	20.3	4.1167	18.8787	14.7620	15.909	5.559	6.968886	2.118
2	20.3	4.1167	18.8787	14.7620	15.917	5.561	6.964101	2.120
3	20.4	4.1167	18.8787	14.7620	15.947	5.572	6.967216	2.119
Mean^4: 2.119
SD: 0.10%
4	20.4	4.1167	18.4571	14.3404	15.899	5.521	6.759813	2.121
5	20.4	4.1167	18.4571	14.3404	15.936	5.535	6.766817	2.119
6	20.4	4.1167	18.4571	14.3404	15.978	5.551	6.775379	2.117
Mean^4: 2.119
SD: 0.20%
Mean^5: 2.119
SD: 0.00%

¹– pressure readings obtained ater pressurising the sample cell filled with test item.

^{2, 3}– calculations attached.

⁴– mean of replicate measurements.

⁵- mean of independent sample values.

SD - standard deviation.

Conclusions:

The relative density of Potassium pentahydrogen bis(phosphate) was determined to be 2.119 g/cm³.

This study is conducted according to an appropriate guideline and under the conditions of GLP and therefore the study is considered to be acceptable and to adequately satisfy both the guideline requirement and the regulatory requirement as a key study for this endpoint.

Description of key information

One key study exists. This study (Fieseler A, 2009) was conclusive, done to a valid guideline (EU Method A.3) and the study was conducted under GLP conditions. It is therefore scientifically justified for use as a key study under Regulation (EC) No. 1907/2006.

Key value for chemical safety assessment

Relative density at 20C:

2.119

Additional information

The relative density of Potassium pentahydrogen bis(phosphate) was determined to be 2.119 g/cm³.