Selenious acid

Selenious acid Basic information
Product Name:Selenious acid
Synonyms:Selenousacid(99.999%-Se)PURATREM;SELENIOUSACID,REAGENT;SELENOUS ACID: 99.999% PURATREM;seleniousacid(h2seo3);seleniousacid10;SELENOUS ACID 99%;Selenium, AAS standard solution, Specpure(R), Se 1000μg/ml;Selenium, plasma standard solution, Specpure(R), Se 10,000μg/ml
CAS:7783-00-8
MF:H2O3Se
MW:128.97
EINECS:231-974-7
Product Categories:Alkaloid reagent;selenium oxy-acid;AA Standard SolutionsAlphabetic;Reference/Calibration Standards;S;SA - SM;Standard Solutions;AAS;AAS CRMsSpectroscopy;AASSpectroscopy;Application CRMs;Matrix Selection;NitrateAlphabetic;Spectroscopy;Inorganics
Mol File:7783-00-8.mol
Selenious acid Structure
Selenious acid Chemical Properties
Melting point 70 °C (dec.) (lit.)
Boiling point 684.9 °C(lit.)
density 3.004 g/mL at 25 °C (lit.)
vapor pressure 2.7hPa at 15℃
Fp 690°C
storage temp. Store at RT.
solubility H2O: soluble
pka2.46(at 25℃)
form powder
color White to almost white or light pink
Specific Gravity3.004
PH3.15(1 mM solution);2.47(10 mM solution);1.9(100 mM solution)
Water Solubility 167 g/100 mL (20 ºC)
Sensitive Hygroscopic
Merck 14,8430
Exposure limitsACGIH: TWA 0.2 mg/m3
NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3
Stability:Stable.
CAS DataBase Reference7783-00-8(CAS DataBase Reference)
EPA Substance Registry SystemSelenious acid (H2SeO3) (7783-00-8)
Safety Information
Hazard Codes T,N,Xi
Risk Statements 36/38-50/53-33-23/25-52/53
Safety Statements 61-60-45-28A-20/21-26-28
RIDADR UN 3440 6.1/PG 3
WGK Germany 3
RTECS VS7700000
3
TSCA Yes
HazardClass 8
PackingGroup III
HS Code 28111980
Hazardous Substances Data7783-00-8(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
Selenious acid Usage And Synthesis
DescriptionSelenious acid is a colourless, deliquescent crystal in appearance. It decomposes on heating, producing water and toxic fumes of selenium oxides.
It is incompatible with strong reducing agents, organic materials, and finely powdered metals and reacts on contact with acids producing toxic gaseous hydrogen selenide. Selenious acid is a non-combustible chemical. On fire/burning, it emits irritating or toxic fumes (or gases).
The major use of selenious acid is in changing the colour of steel, especially the steel in guns from silver grey to blue grey. It is also used for the chemical darkening and patination of copper brass and bronze, producing a rich dark-brown colour that can be further enhanced with mechanical abrasion.
Chemical PropertiesWhite solid
Chemical PropertiesSelenious acid is a colorless, crystalline solid.
UsesAs an oxidizing agent, as a reagent for alkaloidsSelenous acid is used in steel guns, wherein it changes the color of the steel from silver-grey to blue-grey. It serves as an important component of the Mecke reagent, which is utilized for drug testing. It acts as a source of selenium. It acts as a reagent for alkaloids and an oxidizing agent. Further, it is used in labeling radiopharmaceuticals. It is involved in the organic synthesis for the preparation of glyoxal.
UsesAs a reagent for alkaloids; as oxidizing agent.
DefinitionChEBI: Selenous acid is a selenium oxoacid. It is a conjugate acid of a hydrogenselenite.
General DescriptionColorless solid, transparent, colorless crystals. Used as a reagent for alkaloids and as an oxidizing agent. Isotope is used in labeling radiopharmaceuticals.
Reactivity ProfileSelenious acid decomposes when heated to toxic and volatile selenium dioxide. Serves as an oxidizing agent. Reacts exothermically with many reducing agents including hydroiodic acid, sulfurous acid, sodium hyposulfite, hydroxylamine salts, hydrazine salts, hypophosphorous acid, phosphorous acid [Merck]. Oxidizes many organic substances. Is oxidized to selenic acid by strong oxidizing agents.
HazardToxic by inhalation, ingestion, and skin absorption.
Health HazardSelenious acid and its salts are capable of penetrating the skin and can produce acute poisonings. Causes irritations and burns of the skin. It is highly toxic orally. Inorganic selenium compounds may cause dermatitis.
Fire HazardWhen heated to decomposition Selenious acid emits toxic fumes of selenium. Avoid heating.
Safety ProfilePoison by ingestion, intraperitoneal, and intravenous routes. Human mutation data reported. Used as an oxidizing agent. When heated to decomposition it emits toxic fumes of Se. See also SELENIUM COMPOUNDS
Potential ExposureSelenious acid is used as a reagent for alkaloids and as an oxidizing agent. Isotope is used in labeling radiopharmaceuticals.
ShippingUN3283Selenium compound, solid, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous material, Technical Name Required. UN3440 Selenium compound, liquid, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous material, Technical Name Required.
Purification MethodsRecrystallise the acid from water. On heating it loses water and SeO2 sublimes. [Waitkins & Clark Chem Rev 36 235 1945.]
IncompatibilitiesA strong oxidizer. Reacts exothermically with many reducing agents including hydroiodic acid, sulfurous acid, sodium hyposulfite, hydroxylamine salts, hydrazine salts, hypophosphorous acid, phosphorous acid. Incompatible combustibles, organic material, oxidizable materials, strong acids, strong bases. Contact with acids produce toxic and gaseous hydrogen selenide. Attacks metals.
Waste DisposalConsult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal.
Selenious acid Preparation Products And Raw materials
Raw materialsSelenium
Preparation ProductsQUINOLINE-4-CARBOXYLIC ACID-->Selenium-->Sodium selenite-->Sodium selenite pentahydrate
MERCURIC SELENITE Pralmorelin Selenious acid, zinc salt Ethyl 2-(Chlorosulfonyl)acetate Ascoric Acid ETHYLENEDIAMINE TETRAKIS(PROPOXYLATE-BLOCK-ETHOXYLATE) TETROL Diphenolic acid 4-(Diethylamino)salicylaldehyde Selenious acid hydrogen=sodium salt Selenious acid Folic acid DL-α-Tocopherol Glycine 5-Chlorovaleric acid Selenious acid lead(II) salt phosphoric acid Sodium selenite Citric acid

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