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Sodium selenite

Chemical Properties Application Preparation Category Toxicity grading Acute toxicity Flammability Hazardous Characteristics Storage and Transport Extinguishing agent Occupational standards
Sodium selenite
Sodium selenite structure
Chemical Name:
Sodium selenite
natriumselenit;SODIUM SELENITE;SODIUM SELENIATE;Disodium selenite;Sodiumselenite,99%;SODIUMSELENIUMOXIDE;SODIUMSELENITE,POWDER;sodium selenite .5H2O;SodiumSelenitanhydrous;disodiumseleniumtrioxide
Molecular Formula:
Formula Weight:
MOL File:

Sodium selenite Properties

Melting point:
350 °C
storage temp. 
Store at RT.
Water Solubility 
950 g/L (20 ºC)
CAS DataBase Reference
10102-18-8(CAS DataBase Reference)
EPA Substance Registry System
Selenious acid, disodium salt(10102-18-8)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H300+H330-H315-H317-H319-H411-H300-H331
Precautionary statements  P261-P280g-P301+P310a-P304+P340-P405-P501a-P260-P280-P304+P340+P310-P305+P351+P338-P403+P233
Hazard Codes  T+,N,Xi
Risk Statements  23-28-31-43-51/53-36/37/38
Safety Statements  28-36/37-45-61-28A-36-26
RIDADR  UN 2630 6.1/PG 1
WGK Germany  2
RTECS  VS7350000
HazardClass  6.1
PackingGroup  I
HS Code  28429010
Toxicity LD50 orally in rats: 7 mg/kg (Cummins, Kimura)

Sodium selenite price More Price(13)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 214485 Sodium selenite 99% 10102-18-8 5g $47.4 2018-11-13 Buy
Sigma-Aldrich 214485 Sodium selenite 99% 10102-18-8 100g $101 2018-11-13 Buy
Alfa Aesar 012585 Sodium selenite, anhydrous, 99% min, typically 99.75% min (metals basis) 10102-18-8 100g $59.5 2018-11-16 Buy
Alfa Aesar 012585 Sodium selenite, anhydrous, 99% min, typically 99.75% min (metals basis) 10102-18-8 500g $208 2018-11-16 Buy
Strem Chemicals 93-3414 Sodium selenite, 99% 10102-18-8 250g $161 2018-11-13 Buy

Sodium selenite Chemical Properties,Uses,Production

Chemical Properties

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%.



(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.

Chemical Properties

White to light beige crystals

Chemical Properties

Sodium selenite is a white crystalline substance.


Used in reducing carcinogenesis with potency greater than selenomethionene


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.

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.

Sodium selenite Preparation Products And Raw materials

Raw materials

Preparation Products

Sodium selenite Spectrum

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