Diarsenpentoxid Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
WEISSES, HYGROSKOPISCHES PULVER.
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen über 300°C unter Bildung giftiger Rauche (Arsentrioxid - s. ICSC-Nr. 0378) und Sauerstoff. Schwache S?ure in w?ssriger L?sung. Reagiert sehr heftig mit Brompentafluorid unter Feuer- und Explosionsgefahr. Reagiert mit Reduktionsmitteln unter Bildung hochgiftigen Gases (Arsin - s. ICSC-Nr. 0222). Greift viele Metalle in Gegenwart von Wasser oder Feuchtigkeit an.
ARBEITSPLATZGRENZWERTE
TLV: (als As) 0,01 mg/m?(als TWA) Krebskategorie A1(best?tigte krebserzeugende Wirkung beim Menschen); BEI vorhanden (ACGIH 2005).
MAK: Krebserzeugend Kategorie 1; Keimzellmutagen Kategorie 3A; (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den K?rper durch Inhalation des Aerosols und durch Verschlucken.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachl?ssigbar; eine gesundheitssch?dliche Partikelkonzentration in der Luft kann jedoch schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Die Substanz reizt die Augen, die Haut und die Atemwege. M?glich sind Auswirkungen auf Blut, Herzkreislaufsystem, peripheres Nervensystem und Leber. Exposition weit oberhalb der Arbeitsplatzgrenzwerte kann zum Tod führen. Die Auswirkungen treten u.U. (s. Anm.) verz?gert ein. ?rztliche Beobachtung notwendig.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
M?glich sind Auswirkungen auf Haut (überm??ige Verhornung), Herzkreislauf- und peripheres Nervensystem, Knochenmark (Ver?nderungen des blutbildenden Systems), Leber und Lunge. Krebserzeugend für den Menschen.
LECKAGE
NICHT in die Kanalisation spülen. Verschüttetes Material in Beh?ltern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste sorgf?ltig sammeln. An sicheren Ort bringen. In die Luft freigesetzte Partikel mit feinem Wassersprühstrahl niederschlagen. NICHT in die Umwelt gelangen lassen. Pers?nliche Schutzausrüstung: Chemikalienschutzanzug mit umgebungsluftunabh?ngigem Atemschutzger?t.
R-S?tze Betriebsanweisung:
R23/25:Giftig beim Einatmen und Verschlucken.
R45:Kann Krebs erzeugen.
R50/53:Sehr giftig für Wasserorganismen, kann in Gew?ssern l?ngerfristig sch?dliche Wirkungen haben.
S-S?tze Betriebsanweisung:
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
S53:Exposition vermeiden - vor Gebrauch besondere Anweisungen einholen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
S60:Dieses Produkt und sein Beh?lter sind als gef?hrlicher Abfall zu entsorgen.
Chemische Eigenschaften
Arsenic pentoxide is an important commercial compound of arsenic. It is a white, shapeless (amorphous), crystalline, lumpy solid or, hygroscopic powder, and is not combustible. It emits irritating or toxic fumes (or gases) in a fi re. Arsenic pentoxide is used as a solid or as a solution in the manufacture of arsenates, weed killer, metal adhesives,
insecticides, fungicide wood preservatives, and colored gases, and in printing and dyeing. It can be synthesized either by burning elemental arsenic in oxygen, or by oxidizing
arsenic trioxide with oxidizing agents, such as ozone, hydrogen peroxide, and nitric acid.
Arsenic pentoxide decomposes to oxygen and As2O3 on heating, and dissolves readily
in water to form arsenic acid, H3AsO4. Arsenic pentoxide reacts violently with bromine
pentafl uoride and reducing agents, and attacks many metals in the presence of water or
moisture.
Physikalische Eigenschaften
White amorphous solid; deliquescent; density 4.32 g/cm
3; melts at 315°C; dissolves slowly in water but is very soluble (230 g/100g at 20°C); also soluble in alcohol.
Occurrence
Arsenic pentoxide is used to make colored glass; in fungicide formulations; in adhesive for metals; in wood preservatives; in dyeing and printing; and to prepare arsenates.
Verwenden
Arsenic pentoxide (As2O5) is manufactured by adding oxygen to the trioxide form and is
used to form many arsenic compounds.
synthetische
Arsenic pentoxide is prepared by dehydration of crystalline arsenic acid at 200°C or above. The former is made by treating arsenic metal or arsenious oxide with nitric acid. Also, the pentoxide can be prepared by the reaction of arsenic trioxide with oxygen under pressure.
Allgemeine Beschreibung
A white crystalline solid. Noncombustible. Corrosive to metals in the presence of moisture. Toxic by ingestion.
Air & Water Reaktionen
Dissolves in water to give solutions of arsenic acid.
Hazard
Confirmed carcinogen.
Health Hazard
ARSENIC PENTOXIDE is extremely toxic; the probable oral lethal dose for humans is 5-50 mg/kg, or between 7 drops and 1 teaspoonful for a 150-lb. person. It is irritating to eyes, nose, and throat. Chronic exposure may cause nerve damage to the extremities, alter cellular composition of the blood, and cause structural changes in blood components. There is sufficient evidence that inorganic arsenic compounds are skin and lung carcinogens in humans.
Brandgefahr
Fire may produce irritating or poisonous gases. Reacts with metal and may give off toxic arsine gas. Hazardous polymerization may not occur.
Sicherheitsprofil
Confirmed human
carcinogen. Poison by ingestion and
intravenous routes. Experimental
reproductive effects. Mutation data
reported. Reacts vigorously with Rb2C2.
When heated to decomposition it emits
toxic fumes of arsenic. See also ARSENIC
COMPOUNDS.
m?gliche Exposition
Arsenic pentoxide is used in production
of metal arsenates; as an herbicide, defoliant on cotton;
as a chemical intermediate; as an ingredient in wood preservatives;
and in glass. Other possible uses are as an insecticide
and soil sterilant.
Lager
Arsenic pentoxide should be kept stored separately from strong bases, reducing substances, food, and feedstuffs and dry and safe area.
Versand/Shipping
UN1559 Arsenic pentoxide, Hazard Class: 6.1;
Labels: 6.1-Poisonous materials.
Inkompatibilit?ten
Decomposes above 315 C, forming oxygen
and arsenic trioxide fumes. Arsenic pentoxide is an
oxidizer; reacts violently with bromine pentafluoride and
reducing agents. The solution in water is a weak acid.
Incompatible with acids, strong alkalis; halogens, rubidium
carbide, zinc. Corrosive to metals in the presence of moisture.
Contact with acids or acid mists releases deadly arsine
gas.
Waste disposal
Dissolve in a minimum of
concentrated hydrochloric acid. Dilute with water until
white precipitate forms. Add HCl to dissolve. Saturate with
H2S; filter and wash precipitate and return to supplier.
Alternatively, precipitate with heavy metals, such as lime
or ferric hydroxide in lieu of H2S. If needed, seek
professional environmental engineering assistance from
the United States Environmental Protection Agency
Environmental Response Team at (908) 548-8730 (24-hour
response line). Consult with environmental regulatory agencies
for guidance on acceptable disposal practices.
Generators of waste containing this contaminant (≥100 kg/
mo) must conform with EPA regulations governing storage,
transportation, treatment, and waste disposal. In accordance
with 40CFR165, follow recommendations for the disposal
of pesticides and pesticide containers. Must be disposed
properly by following package label directions or by contacting your local or federal environmental control
agency, or by contacting your regional EPA office.
Vorsichtsma?nahmen
During handling and use of arsenic pentoxide, occupational workers should use protective
gloves, protective clothing, safety goggles or eye protection in combination with breathing protection if using powder, and workers should not eat, drink, or smoke in the area. The worker should NOT wash away the spillage/waste into the sewer. The containers of
arsenic pentoxide may explode when heated
Diarsenpentoxid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
