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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

signalword

Danger

Hazard Classifications

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

Storage Class

11 - Combustible Solids

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

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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