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Sigma-Aldrich

Sodium selenite

anhydrous, ≥90.0% (RT)

Synonym(s):

Selenious acid disodium salt

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About This Item

Linear Formula:
Na2SeO3
CAS Number:
10102-18-8
Molecular Weight:
172.94
EC Number:
233-267-9
MDL number:
MFCD00003489
UNSPSC Code:
12352302
PubChem Substance ID:
329763654
NACRES:
NA.22
Assay:
≥90.0% (RT)
form:
powder
Pricing and availability is not currently available.

Quality Level

200

Assay

≥90.0% (RT)

form

powder

loss

≤0.5% loss on drying, 200 °C

mp

>350 °C (lit.)

SMILES string

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

InChI

1S/2Na.H2O3Se/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2

InChI key

BVTBRVFYZUCAKH-UHFFFAOYSA-L

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Application

Sodium selenite can be used:
  • In dehydrogenation of benzoins to benzils and, flavanones to flavones under thermal and microwave conditions.[1]
  • As a catalyst along with cysteine or glutathione in the reductive debromination of vic-dibromides to alkenes.[2]
  • To prepare bis(methylmercuric) selenide (BMS) by reacting with methylmercuric chloride and reduced glutathione or cysteine.[3]

Sodium selenite is a common source of selenium in the synthesis of zinc selenide (ZnSe).[4] It is used as a key precursor in the synthesis of bismuth selenide nanocomposites,[5] nickel cobalt selenides,[6] selenium nanobelts[7] and t-selenium nanotubes.[8]

Pictograms

Skull and crossbonesEnvironment
GHS06,GHS09

Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Inhalation - Acute Tox. 2 Oral - Aquatic Chronic 2 - Eye Irrit. 2 - Skin Irrit. 2 - Skin Sens. 1

Supplementary Hazards

EUH031

Storage Class Code

6.1A - Combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

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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Certificates of Analysis (COA)

Lot/Batch Number
BCCL5458
BCCJ4772
BCCJ4773
BCCG3610
BCCF9834

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Sodium selenite-dimethylsulfoxide: a highly efficient reagent for dehydrogenation
Lamba M and Makrandi JK
J. Chem. Res. (M), 2008(4), 225-226 (2008)
Cellulose-directed growth of selenium nanobelts in solution.
Lu Q, et al.
Chemistry of Materials, 18(1) (2006)
Multifunctional bismuth selenide nanocomposites for antitumor thermo-chemotherapy and imaging.
Li Z, et al.
ACS Nano, 10(1), 984-997 (2015)
New method for bis (methylmercuric) selenide synthesis from methylmercuric chloride, sodium selenite and reduced glutathione
Naganuma A and Imura N
Chemosphere, 10(4), 441-443 (1981)
Bimetallic nickel cobalt selenides: a new kind of electroactive material for high-power energy storage.
Chen H, et al.
Journal of Material Chemistry A, 3(47), 23653-23659 (2015)
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  1. How is shipping temperature determined? And how is it related to the product storage temperature?

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    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

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    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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