Selensure

Bezeichnung:Selensure

CAS-Nr7783-08-6

Englisch Name:Selenic acid

CBNumberCB7854327

SummenformelH2O4Se

Molgewicht144.97

MOL-Datei7783-08-6.mol

Synonyma

Selensure

Selensure physikalisch-chemischer Eigenschaften

Schmelzpunkt	58°C
Siedepunkt	260°C
Dichte	1.407 g/mL at 25 °C
Brechungsindex	n20/D 1.5174(lit.)
Flammpunkt	>230 °F
Löslichkeit	Miscible with sulfuric acid. Immiscible with ammonia.
Aggregatzustand	Liquid
pka	4.19±0.10(Predicted)
Farbe	Colorless
PH	2.74(1 mM solution);1.83(10 mM solution);0.97(100 mM solution)
Wasserlöslichkeit	g/100g H2O: 426 (0°C), 567 (20°C), 1328 (30°C) [LAN05]; decomposed by alcohol [HAW93]
Merck	14,8429
Expositionsgrenzwerte	ACGIH: TWA 0.2 mg/m3 NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3
Stabilität	Stable, but decomposes on heating. Non-flammable. Incompatible with metals, combustible materials. Hygroscopic.
CAS Datenbank	7783-08-6(CAS DataBase Reference)
EPA chemische Informationen	Selenic acid (7783-08-6)

Sicherheit

Kennzeichnung gefährlicher	T,N
R-Sätze:	23/24/25-34-50/53-33-23/25-41-38
S-Sätze:	23-26-36/37/39-45-61-60-28-20/21-16
RIDADR	UN 3264 8/PG 1
WGK Germany	2
RTECS-Nr.	VS6575000
TSCA	Yes
HazardClass	8
PackingGroup	I
HS Code	2811198090
Giftige Stoffe Daten	7783-08-6(Hazardous Substances Data)

Gefahreninformationscode (GHS)

Selenic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R23/24/25:Giftig beim Einatmen, Verschlucken und Berührung mit der Haut.
R34:Verursacht Verätzungen.
R50/53:Sehr giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
R33:Gefahr kumulativer Wirkungen.
R23/25:Giftig beim Einatmen und Verschlucken.
S-Sätze Betriebsanweisung:
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
S28:Bei Berührung mit der Haut sofort abwaschen mit viel . . . (vom Hersteller anzugeben).
S20/21:Bei der Arbeit nicht essen, trinken,rauchen.
Chemische Eigenschaften
Anhydrous H2SeO4 forms colorless prismatic or needle-shaped crystals; extremely hygroscopic; the melt tends to supercool. On heating, decomposes into SeO2, O2 and H2O.
Verwenden
Selenic acid is used as an oxidizing agent. Its derivative sodium selenate is used in the preparation of glass and animal feeds. It acts as an analytical reagent and also used for the preparation of other selenium salts such as gold(III) selenate. Further, it reacts with fluorosulfuric acid to get selenoyl fluoride.
synthetische
SeO2 + H2O2 = H2SeO4
The oxidation is carried out in aqueous solution so that dilute selenic acid solution is obtained first; this may be concentrated to the anhydrous acid by evaporation.
Definition
ChEBI: Selenic acid is a selenium oxoacid. It is a conjugate acid of a hydrogenselenate.
Allgemeine Beschreibung
A white crystalline solid. Very corrosive to skin, eyes and mucous membranes. Corrosive to metal. Toxic by skin absorption and by ingestion.
Air & Water Reaktionen
Very hygroscopic. Soluble in water.
Reaktivität anzeigen
Selenic acid, LIQUID reacts exothermically with chemical bases (for example: amines and inorganic hydroxides) to form salts. The reactions can generate dangerously large amounts of heat in small spaces. A good oxidizing agent. May oxidize organic matter such as wood, cotton, fiberboard, etc.. Reacts with active metals, including iron and aluminum, and also less active metals, to dissolve the metal and liberate hydrogen and/or toxic gases. Can initiate polymerization in certain classes of organic compounds. Reacts with cyanide salts and compounds to release gaseous hydrogen cyanide. Flammable and/or toxic gases are also often generated with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and weak or strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and even carbonates: the carbon dioxide gas from the last is nontoxic but the heat and spattering from the reaction can be troublesome. May often catalyze (increase the rate) of chemical reactions.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Brandgefahr
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Sicherheitsprofil
Selenium compounds are poisons. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of Se. See also SELENIUM COMPOUNDS,

Selensure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7783-08-6, Selenic acid Verwandte Suche:

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