Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate

Appearance / physical state / colour

Administrative data

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other:

Remarks:

The appearance of the test item is described in a reliable study report on the physicalchemical properties of the substance. Since no guideline was followed and no details on the methods are given, the description is considered as reliable with restrictions.

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2008

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

2012

GLP compliance:

not specified

Type of method:

air comparison pycnometer (for solids)

Remarks:

Gas comparison pycnometer

Key result

Type:

relative density

Density:

1.7 other: dimensionless

Temp.:

20 °C

Two tests with different amounts of the test item were performed to determine the relative density D₄²⁰ at a temperature of 20 °C ± 0.01 °C. Results are shown below:

Test No.	Temperature [°C]	Amount of test item [g]	Average sample volume [cm^3]	Density [g/cm^3]*
1	20	6.41	3.76970	1.70040
2	20	6.52	3.83816	1.69873
* The pressurizing-expansion cycles are performed until 5 subsequent volume measurements have a relative standard deviation (RSD) of ≤ 0.2 %.

The mean density of the test item at 20 °C is 1.69956 g/cm³. The relative density is calculated by dividing the density of the test item by the density of water at 4 °C (0.9999750 g/cm3).

The relative density is D₄²⁰ = 1.70.

Conclusions:

The relative density of the test item Oxonole Blue at 20 °C ± 0.01 °C (compared to water at 4 °C) is 1.70.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

no guideline required

Principles of method if other than guideline:

Visual inspection.

Test material

Test material information

Constituent 1

Reference substance name:

Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate

EC Number:

257-479-6

EC Name:

Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate

Cas Number:

51858-17-4

Molecular formula:

C25H16N4O12S2.2K

IUPAC Name:

dipotassium dihydrogen 4-{5-[3-carboxylato-5-oxo-1-(4-sulfonatophenyl)-1,5-dihydro-4H-pyrazol-4-ylidene]penta-1,3-dien-1-yl}-5-hydroxy-1-(4-sulfonatophenyl)-1H-pyrazole-3-carboxylate

Test material form:

solid: crystalline

Results and discussion

Physical state at 20°C and 1013 hPa:

solid

Form / colour / odour

Key result

Form:

solid: particulate/powder

Colour:

Dark blue to green

Substance type:

organic