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71913

Sigma-Aldrich

Sodium polytungstate

purum p.a., for the preparation of heavy liquid, for sink-float analysis, ≥85% WO3 basis

Synonym(s):

Sodium metatungstate, hexa-Sodium tungstate (W12)

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About This Item

Linear Formula:
3Na2WO4 · 9WO3 · H2O
CAS Number:
12141-67-2
Molecular Weight:
2986.01
EC Number:
412-770-9
MDL number:
MFCD00061466
UNSPSC Code:
12352207
PubChem Substance ID:
329763629
NACRES:
NA.75

grade

for sink-float analysis
purum p.a.

Assay

≥85% WO3 basis

form

powder or crystals

quality

for the preparation of heavy liquid

color

white to off-white

pH

3 (20 °C)

density

3.1 g/cm3 at 20 °C (saturated aqueous solution)

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O

InChI

1S/6Na.39O.12W/q6*+1;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6*-1;;;;;;;;;;;;

InChI key

AZCSOJKJFMWYCX-UHFFFAOYSA-N

Application

Sodium polytungstate (SPT) is widely used to produce heavy liquid for sink /float analysis (gravity separation) and density gradient centrifugation due to its very high solubility in water.

Other Notes

A new medium for density-gradient centrifugation, the density can be adjusted to up to 3.1 g/ml

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H302,H318,H412

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Chronic 3 - Eye Dam. 1

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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