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Physical & Chemical properties

Appearance / physical state / colour

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Reference
Endpoint:
appearance / physical state / colour
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data from peer-reviewed handbook or collection of data.
Justification for type of information:
1. HYPOTHESIS FOR THE CATEGORY APPROACH: The hypothesis is that properties are likely to be similar or follow a similar pattern because of the presence of a common metal ion, in this case tungstate.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES):
Source: Ammonium paratungstate
Target: Ammonium metatungstate
3. CATEGORY APPROACH JUSTIFICATION: See Annex 3 in CSR
4. DATA MATRIX: See Annex 3 in CSR
Reason / purpose for cross-reference:
read-across: supporting information
Principles of method if other than guideline:
Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.
GLP compliance:
no
Physical state at 20°C and 1013 hPa:
solid
Form:
powder
Colour:
white
Substance type:
inorganic
Conclusions:
White, crystallized powder
Executive summary:

Due to the similar chemical constituency and structure between the source substance (ammonium paratungstate, EC name: ammonium wolframate) and the target substance (ammonium metatungstate, EC name: hexaammonium wolframate), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of read-across is appropriate for this endpoint. For more details, refer to the read-across category approach description in the Category section of this IUCLID submission or Annex 3 of the CSR.

Description of key information

White, crystallised powder

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

Due to the similar chemical constituency and structure between the source substance (ammonium paratungstate, EC name: ammonium wolframate) and the target substance (ammonium metatungstate, EC name: hexaammonium wolframate), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of read-across is appropriate for this endpoint. For more details, refer to the read-across category approach description in the Category section of this IUCLID submission or Annex 3 of the CSR.

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