Reaction mass of Cobaltate(2-), [2-[[[4-hydroxy-3-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo]phenyl]sulfonyl]amino]benzoato(3-)][2-[[2-hydroxy-5-[(phenylamino)sulfonyl]phenyl]azo]-3-oxo-N-phenylbutanamidato(2-)]-, disodium and Cobaltate(3-), bis[2-[[[4-hydroxy-3-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo]phenyl]sulfonyl]amino]benzoato(3-)]-, trisodium and sodium bis[2-[[2-hydroxy-5-[(phenylamino)sulphonyl]phenyl]azo]-3-oxo-N-phenylbutyramidato(2-)]cobaltate(1-)

Endpoint summary

Description of key information

The substance is a dark brown organic powder at 20 °C and 1013 hPa. It decomposes before melt/boil.

It does not meet the criteria to be considered as self-heating/flammable/explosive/oxidising agent.

Additional information

APPEARANCE AND STATE

Acid Yellow 235 is a dark green organic powder at 20 °C and 1013 hPa.

Thermal behaviour was investigated by the Differential Scanning Calorimetry (DSC) and confirmed by capillary method. The test item has no melting point up to its decomposition starting at a temperature of approx. 260 °C. In the temperature range from 40 to 220 °C a broad endothermic effect was observed, which shows no typical melting or boiling signal. An exothermic effect was observed starting from 260 °C with an averaged energy release of -190 J/g. The endothermic effects found in the DSC measurements cannot be assigned to melting or boiling of the test item.

Due to the thermal behaviour, vapour pressure can be considered as negligible.

The relative density resulted to be 1.551 at 20 °C.

SOLUBILITY and PARTITION COEFFICIENT

Water solubility test was run according to the OECD guideline 105, using flask method. The water solubility was determined to be 14.69 g/l at 20 °C at pH 9.7 - 9.9; the recovery rate of the measured standard solutions was in the range from 97.6 % to 101.9 %, which shows a good accuracy of the analytical method.

The partition coefficient was determined by HPLC method, following the procedures outlined into the OECD guideline 117. Due to the fact, that the test item consist of several components, as much peaks for the test item were observed. The retention time was calculated for the each peak separately. For all three peaks the retention time resulted to be less than the retention time of the measured reference item with the lowest partition coefficient (4-Methoxyphenol). Therefore, the log Pow was determined to be lower than 1.3 at 20 °C.

PHYSICAL HAZARDS

Acid Yellow 235 does not ignite and propagate combustion. The screening evaluation failed to evidence reasons of concern regarding the explosiveness on the basis of the thermal behaviour investigation. On the basis of the Grewer Oven test results, the substance failed to meet the criteria to be classified as self-heating substance.

Acid Yellow 235 does not meet the criteria to be considered as self-heating/flammable/explosive/ oxidising agent.