This product is an 85% solution. The purity and trace elements is not determined. The concentration is verified by gravimetric analysis, which is reported in the lot specific Certificate of Analysis. Please see the link below to review a sample or lot specific certificate:
https://www.sigmaaldrich.com/product/sigma/71913#product-documentation
71913
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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25 G
CLP 189,000
100 G
CLP 570,000
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25 G
CLP 189,000
100 G
CLP 570,000
About This Item
Linear Formula:
3Na2WO4 · 9WO3 · H2O
CAS Number:
Molecular Weight:
2986.01
EC Number:
MDL number:
UNSPSC Code:
12352207
PubChem Substance ID:
NACRES:
NA.75
Recommended Products
grade
for sink-float analysis
purum p.a.
Quality Level
Assay
≥85% WO3 basis
form
powder or crystals
quality
for the preparation of heavy liquid
technique(s)
titration: suitable
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.[1]
Signal Word
Danger
Hazard Statements
Precautionary Statements
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
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What is the purity of this product? Will there be C or N contamination?
1 answer-
Helpful?
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I would like to ask how and how much grams do I need to prepare 1200 ml solution at a density of 1.6g/cm3
1 answer-
Sodium Polytungstenate (SPT) has not been investigated for use in the preparation of heavy liquids. A brief search of the literature reveals information that may be helpful. The maximum achievable density, 3.10 g/cm³, is prepared from 133 g of SPT in 22 grams of deionized water at 20°C. A density of 1.56 g/cm³ may be prepared from 35.01 g of SPT in 42.94 grams of deionized water. A density of 1.73 g/cm³ may be prepared from 45.15 g of SPT in 41.10 grams of deionized water. Using the same ratios and adjusting the volume of water or the amount of SPT experimentally, would be the best method to achieve a specific volume at the desired density of 1.6 g/cm³.
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