Vanadium oxysulphate

Hydrolysis

Administrative data

Endpoint:

hydrolysis

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Justification for type of information:

The substance is manufactured in water and used in water.
Being inorganic, dissociation occurs in solution and there is not mechanism that woudl result in hydrolysis.
The oxidation state of vanadium will change in the presence or absence of water, but this substance is not possible to isolate from water without changes in oxidation state (as observed by colour changes when attempts to dry were made)

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

no guideline followed

Principles of method if other than guideline:

Direct observation of the material
Attempts were made to remove water.

GLP compliance:

no

Specific details on test material used for the study:

Production material was taken and attempts made to remove water.
Analysis demonstrated ca 36 - 37% actives in water

Physical state at 20°C and 1013 hPa:

liquid

Remarks:

As supplied

Key result

Form:

liquid

Colour:

Green

Substance type:

inorganic

Attempts were made to remove water by heating, but colour change indicated a potential change in oxidation state. The registered substance is of mixed valancy.

Even if managing to obtain dry material, it is very hygroscopic and not possible to handle without absorbance of water.

Conclusions:

Not possible to remove from water without apparent degradation / oxidation

Cross-reference 2

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

As the substance is not possible to isolate from water without possible chemical changes, finding an absolute solublity in water is not possible

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

Solublity measured at different pH levels

Principles of method if other than guideline:

The solublity was measured by drying and then re-dissolving in different proportions in water and at different pH

GLP compliance:

no

Type of method:

flask method

Water solubility:

ca. 500 g/L

Conc. based on:

test mat.

Loading of aqueous phase:

500 g/L

Temp.:

20 °C

pH:

ca. 1.1

Remarks on result:

other: Supplied as up to 40% in water. Attempts to remove water led to colour change, suggesting change in oxidation state

Water solubility:

< 100 g/L

Conc. based on:

test mat.

Loading of aqueous phase:

100 g/L

Temp.:

20 °C

pH:

ca. 4

Remarks on result:

other: At higher pH, solublity is greatly reduced

The substance is mannufactered and supplied in solution at up to 40% (400 g/l w/w) and has pH 1.1

Attemptes to remove water led to colour change suggesting changes in oxidation state of the vanadium

A nominal 500 g/l is used for the CSR

Conclusions:

The substance is mannufactered and supplied in solution at up to 40% (400 g/l w/w).
Attemptes to remove water led to colour change suggesting changes in oxidation state of the vanadium
A nominal 500 g/l is used for the CSR