1-3 dihydroxy-2,4bis-(4-(2-sulfooxyethanesulfonyl)-phenylazo) benzene disodium salt

Appearance / physical state / colour

Link to relevant study record(s)

Reference

Endpoint:

appearance / physical state / colour

Type of information:

other: Company data

Remarks:

qualitative assessment

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Appearance, physical state and colour at 25°C have been qualitative assessed by visual estimation of many samples, confirmed by all users and confirmed by melting and boiling point measurements for physical state

Qualifier:

no guideline followed

Principles of method if other than guideline:

Qualitative assessment

Within a preliminary test an applicable concentration was determined.
1 g of "Reactive Blendwell Orange” was weighed into a 250 ml measuring flask and dissolved with demineralized
water (DW) to prepare the stock solution. Afterwards the stock solution was diluted: 4ml + 496 ml of DW.
The solutions and bind solution were tempered at 20°C. After reaching the auto zero, a single beam photometer Perkin Elmer Lambda 25 was used for the measurement.
A first measure with the cell filled up with the corresponding blank solution (DW) was done to establish the base line.
After that, a second measure with the sample solution was also done.
Parameters:
Instrument: Perkin Elmer Lambda 25 (configured as single beam), using 1 cm path-length and UV Winlab
V:2,85,04
Solvent: demineralized water
Range: 380 nm - 740 nm
Scan speed: 240 nm/ min
Wavelength interval: 1 nm
Ordinate type: A
Slit: 1 nm
Smooth: 2 nm
Path length: 1 cm
Testing temperature: 20 °C
Results:
The test item “Orange Blendwell" showed absorption maxima at 418. nm (figure)

GLP compliance:

no

Physical state at 20°C and 1013 hPa:

solid

Remarks:

solid powder

Key result

Form:

solid: particulate/powder

Colour:

dark orange

Odour:

odourless

Substance type:

organic

Conclusions:

The substance is solid dark orange powder odourless

Executive summary:

The substance is solid dark orange powder odourless

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

solid

Additional information

the substance is solid dark orange powder odourless