There are no specific recommendations on the concentration of Sodium phosphotungstate solution to prepare in order to achieve a given refractive index. In general the refractive index should increase as the concentration of the Sodium polytungstate increases. The solvent used and the solution's temperature can also affect refractive index values.
71913
Sodium polytungstate
purum p.a., for the preparation of heavy liquid, ≥85% WO3 basis
Synonym(s):
Sodium metatungstate, hexa-Sodium tungstate (W12)
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| Size/SKU | Availability | Price |
|---|---|---|
25 g | Please contact Customer Service for Availability | CZK 3,030.00 |
100 g | Please contact Customer Service for Availability | CZK 9,140.00 |
About This Item
Linear Formula:
3Na2WO4 · 9WO3 · H2O
CAS Number:
Molecular Weight:
2986.01
NACRES:
NA.75
PubChem Substance ID:
UNSPSC Code:
12352207
EC Number:
412-770-9
MDL number:
grade
purum p.a.
Quality Segment
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.
Other Notes
A new medium for density-gradient centrifugation, the density can be adjusted to up to 3.1 g/mlcitationcitation
A new medium for density-gradient centrifugation, the density can be adjusted to up to 3.1 g/ml
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This Item | |||
|---|---|---|---|
| technique(s) titration: suitable | technique(s) - | technique(s) - | technique(s) - |
| grade purum p.a. | grade - | grade - | grade - |
| color white to off-white | color - | color - | color - |
| application(s) diagnostic assay manufacturing | application(s) diagnostic assay manufacturing | application(s) diagnostic assay manufacturing | application(s) diagnostic assay manufacturing |
| form powder or crystals | form powder | form powder or crystals | form powder or crystals |
| storage temp. room temp | storage temp. - | storage temp. room temp | storage temp. - |
signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 4 Oral - Aquatic Chronic 3 - Eye Dam. 1
Storage Class
11 - Combustible Solids
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Gloves
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How can I modify the refractive index of water with sodium polytugnsten to achieve a value around 1.5 within a temperature range of 10-40°C? is there a table or somewhere to look how the refraction index changes with the concentration of the solution?
1 answer-
Helpful?
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What is the purity of this product? Will there be C or N contamination?
1 answer-
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-documentationHelpful?
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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.
Helpful?
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