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10102-18-8 Usage

Chemical Properties

Different sources of media describe the Chemical Properties of 10102-18-8 differently. You can refer to the following data:
1. White colored crystalline solid. It could form pentahydrate. It is stable in air and could lose water in dry air. It is soluble in water, insoluble in ethanol. The theoretical selenium content is 45.7%.
2. White to light beige crystals
3. Sodium selenite is a white crystalline substance.


Nutrition enhancer. Determination of alkaloids and preparation of red colored glass and glaze. Feed additive. Selenium is a component of glutathione peroxidase, maintains the function of the cell membrane through oxidation, and increase the production of protein lipid based endogenous antioxidants. It involves in the energy conversion, effects the metabolism, plays an important role in the fat emulsification and absorption, and in the absorption of a variety of vitamins. At the same time, it involves in the synthesis of coenzyme A and coenzyme Q, effects the function of other enzyme systems. It influences the metabolism of amino acids, protein synthesis, carbohydrate metabolism, and biological oxidation. The lack of selenium in livestock and poultry seriously affect the growth and reproduction.


(1) Selenite reacts with sodium hydroxide to produce sodium selenite. Further refinement and addition of dilution agent to obtain the final product. (2) Selenium reacts with nitric acid to produce selenium oxide, which reacts with sodium hydroxide to produce sodium selenite. Followed drying and grinding to obtain the final product.


Toxic substance

Toxicity grading

Highly toxic

Acute toxicity

Oral-rat LD50: 7 mg/kg; oral-mouse LD50: 7.08 mg/kg.

Flammability Hazardous Characteristics

Non-combustible; gives off toxic fume of selenium oxide in a fire.

Storage and Transport

Stored in a well-ventilated area, at low temperature, and dry condition; food should be stored and transported separately.

Extinguishing agent

Sand, water.

Occupational standards

TLV-TWA 0.2 mg (Selenium)/m3; STEL 0.3 mg (Selenium)/m3.


Different sources of media describe the Uses of 10102-18-8 differently. You can refer to the following data:
1. Sodium selenite Na2O3Se is used in the production of red enamels and in the manufacture of clear red glass.
2. Used in reducing carcinogenesis with potency greater than selenomethionene
3. Removing green color from glass during its manufacture; alkaloidal reagent.


ChEBI: An inorganic sodium salt composed of sodium and selenite ions in a 2:1 ratio.

General Description

A white colored crystalline solid. Soluble in water and more dense than water. Contact may irritate skin, eyes and mucous membranes. Toxic by ingestion, inhalation and skin absorption.

Air & Water Reactions

Soluble in water.

Reactivity Profile

Sodium selenite is incompatible with strong acids.


Toxic by ingestion.

Health Hazard

Toxic by ingestion. In humans, a concentration of 5 ppm in food or 0.5 ppm in milk or water has been estimated to be dangerous. Elemental selenium has low acute systemic toxicity, but dust or fumes can cause serious irritation of the respiratory tract.

Fire Hazard

May burn but will not ignite readily. When heated to decomposition, may emit toxic fumes of selenium and sodium oxide. Stable in air.

Flammability and Explosibility


Safety Profile

Poison by ingestion, intraperitoneal, intravenous, subcutaneous, intracervical, parenteral, and intramuscular routes. Experimental teratogenic and reproductive effects. Questionable carcinogen. Human mutation data reported. When heated to decomposition it emits toxic fumes of Se and Na2O. See also SELENIUM COMPOUNDS.

Potential Exposure

Sodium selenite is used in glass manufacturing and as an alkaloidal reagent; for removing green color from glass during its manufacture; alkaloidal reagent; reagent in bacteriology; testing germination of seeds; decorating porcelain; as a livestock feed additive.


UN2630 Selenates or Selenites, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Purification Methods

Crystallise sodium selenite from a saturated aqueous solution where its solubility is 68% at 20o to give the pentahydrate salt. This yields the anhydrous salt on heating at 40o. [Fehér in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 431 1963].


The aqueous solution is a medium strong base. Reacts with water, strong acids; hot surfaces; causing decomposition and a toxic hazard.

Waste Disposal

Liquid or solid: make a strongly acidic solution using hydrochloric acid. Slowly add sodium sulfite to the cold solution. Stir mixture producing sulfur dioxide. Heat, forming dark-gray selenium and black tellurium. Let stand overnight. Filter and dry. Ship to supplier.

Check Digit Verification of cas no

The CAS Registry Mumber 10102-18-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,1,0 and 2 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 10102-18:
28 % 10 = 8
So 10102-18-8 is a valid CAS Registry Number.

10102-18-8 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Sigma-Aldrich

  • (71950)  Sodiumselenite  anhydrous, ≥95.0% (RT)

  • 10102-18-8

  • 71950-100G

  • 1,090.44CNY

  • Detail
  • Sigma-Aldrich

  • (71950)  Sodiumselenite  anhydrous, ≥95.0% (RT)

  • 10102-18-8

  • 71950-500G

  • 4,477.59CNY

  • Detail
  • Sigma

  • (S9133)  Sodiumselenite  γ-irradiated, lyophilized powder, BioXtra, suitable for cell culture

  • 10102-18-8

  • S9133-1MG

  • 531.18CNY

  • Detail
  • Sigma

  • (S5261)  Sodiumselenite  BioReagent, suitable for cell culture, ≥98%

  • 10102-18-8

  • S5261-10G

  • 328.77CNY

  • Detail
  • Sigma

  • (S5261)  Sodiumselenite  BioReagent, suitable for cell culture, ≥98%

  • 10102-18-8

  • S5261-25G

  • 716.04CNY

  • Detail
  • Sigma

  • (S5261)  Sodiumselenite  BioReagent, suitable for cell culture, ≥98%

  • 10102-18-8

  • S5261-100G

  • 1,533.87CNY

  • Detail
  • Sigma

  • (214485)  Sodiumselenite  99%

  • 10102-18-8

  • 214485-5G

  • 469.17CNY

  • Detail
  • Sigma

  • (214485)  Sodiumselenite  99%

  • 10102-18-8

  • 214485-100G

  • 1,003.86CNY

  • Detail
  • Sigma

  • (214485)  Sodiumselenite  99%

  • 10102-18-8

  • 214485-500G

  • 3,871.53CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name disodium selenite

1.2 Other means of identification

Product number -
Other names Sodium selenite

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:10102-18-8 SDS

10102-18-8Synthetic route

selenium(IV) oxide

selenium(IV) oxide

sodium carbonate

sodium carbonate



In neat (no solvent, solid phase) metal carbonate is reacted with solid SeO2 (fusion);

10102-18-8Downstream Products

10102-18-8Relevant articles and documents

Matrix Isolation and Mass Spectrometric Studies of the Vaporization of Alkali Metal Oxoselenium Salts: Characterization of Molecular M2SeO4, M2SeO3, and MSeO2

Brisdon, Alan K.,Gomme, Robin A.,Ogden, J. Steven

, p. 2927 - 2931 (2007/10/02)

Solid samples of alkali metal selenates (M2SeO4) and selenites (M2SeO3) have been heated in vacuo, and the vaporization products studied by using a combination of mass spectrometric and matrix isolation IR techniques.Although some decomposition was observed, evidence was obtained for the existence of the ternary molecular salts M2SeO4 and M2SeO3 (M = Na, K, Rb, Cs) and also for the novel Se(III) species MSeO2.The molecular symmetries are identified as D2d, Cs, and C2v respectively, on the basis of vibrational selection rules, and the various O-Se-O bond angles in these species are estimated from selenium isotope shifts and relative band intensities.

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