Arsensure Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
FARBLOSE, VISKOSE, HYGROSKOPISCHE FLüSSIGKEIT.
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen unter Bildung giftiger und ?tzender Rauche. Starkes Oxidationsmittel. Reagiert mit brennbaren und reduzierenden Stoffen. Mittelstarke S?ure. Greift Metalle unter Bildung giftigen und entzündlichen Arsins (s. ICSC 0222) 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 der D?mpfe, über die Haut und durch Verschlucken.
INHALATIONSGEFAHREN
Beim Verdampfen bei 20°C und beim Versprühen kann sehr schnell eine gesundheitssch?dliche Kontamination der Luft eintreten.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Die Substanz reizt die Augen, die Haut und die Atemwege. M?glich sind Auswirkungen auf das Blut, Herzkreislaufsystem, Magendarmtrakt, Leber und periphere Nervensystem. Die Auswirkungen treten u.U. verz?gert ein (s. Anm.).
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
M?glich sind Auswirkungen auf das periphere Nervensystem und die Haut mit nachfolgenden Nervenerkrankungen und Hautsch?den. M?glich sind Auswirkungen auf das Herzkreislaufsystem. Krebserzeugend für den Menschen.
LECKAGE
Gefahrenbereich verlassen! Fachmann zu Rate ziehen! Pers?nliche Schutzausrüstung: Vollschutzanzug mit umgebungsluftunabh?ngigem Atemschutzger?t. NICHT in die Umwelt gelangen lassen. Ausgelaufene Flüssigkeit in abdichtbaren Kunststoffbeh?ltern sammeln. Reste mit Sand oder inertem Absorptionsmittel aufnehmen und an einen sicheren Ort bringen.
Chemische Eigenschaften
Arsenic acid is a clear, white, semi-transparent crystal (sugar or sand-like) material.
Arsenic acid is one of the most commercially important pentavalent compounds of
arsenic. It is used for wood treatment/wood preservative, as a drying agent, a soil sterilant, and to make other arsenates. It is a broad-spectrum biocide, a fi nishing agent
for glass and metal, and a reagent in the retard of dyestuffs and organic arsenic compounds. Arsenic acid decomposes on heating, producing toxic and corrosive fumes. It
is a strong oxidant and reacts with combustible and reducing materials and attacks/
damages metals to produce toxic and flammable arsine. It is soluble in water and forms
the arsenate ion.
Physikalische Eigenschaften
Hygroscopic translucent crystals; density between 2 to 2.5 g/cm
3; melts at 35.5°C; loses water when heated to 160°C; highly soluble in cold water; soluble in alcohol, glycerol and alkalies.
Verwenden
Pesticides; herbicides; fungicides; algicides.
synthetische
Arsenic acid is prepared by treating arsenic trioxide with concentrated nitric acid; or by combination of arsenic pentoxide with water. The latter reaction is very slow. It is also formed when meta- or pyroarsenic acid is treated with cold water.
Definition
Any salt or ester of arsenic acid. They are distributed widely in nature and contaminate coal and metal ores. Arsenates uncouple oxidative phosphorylation by replacing inorganic phosphorous in the ATP.
Allgemeine Beschreibung
White crystals. Melting point 95°F. Excessive drying produces As2O5.5/3H2O.
Air & Water Reaktionen
Hygroscopic. Water soluble.
Reaktivit?t anzeigen
ARSENIC ACID may evolve very toxic gaseous arsine (AsH3) from contact with active metals, such as zinc and aluminum [Inorganic Chemicals Handbook, I, p. 175]. When heated to decomposition, ARSENIC ACID produces toxic fumes of metallic arsenic [Sax, 9th ed., p. 271]. The solution is weakly acidic and a weak oxidizing agent. Reacts with alkalis to generate some heat and precipitate arsenates.
Hazard
Carcinogen; toxic.
Health Hazard
Arsenic acid is absorbed into the body by inhalation of its vapor, through the skin, and
by ingestion. Arsenic acid is an eye irritant and may cause burns. Most injuries result
from exposure to dusts, causing conjunctivitis, lacrimation, photophobia, and chemosis.
Exposures to arsenic acid cause poisoning with symptoms of irritation of the eyes, the
skin, the respiratory tract, respiratory distress, sore throat, nausea, vomiting, diarrhea,
poor appetite, and stomach cramps. Arsenic acid also causes effects on the blood, cardiovascular system, gastrointestinal tract, liver, and peripheral nervous system, leading to polyneuropathy and convulsions. Repeated exposures to high concentrations of arsenic
acid have been reported to cause nerve damage, with “pins and needles,” numbness, and
weakness of the arms and legs, and even death. Tachycardia is frequently reported following ingestion of arsenic acid salts and is contributed to by anxiety, intravascular fl uid
depletion, and possibly direct arsenic-induced cardiotoxicity.
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
Confirmed human
carcinogen. Poison by ingestion. An
experimental teratogen. Human mutation
data reported. When heated to decomposition it emits toxic fumes of
arsenic. See also ARSENIC
COMPOUNDS.
Lager
Arsenic acid should be kept stored in an area without drain or sewer access. It should be
separated from strong oxidants, strong bases, metals, strong reducing agents, food, and
feedstuffs. Occupational workers should keep arsenic acid in a cool, well-ventilated area,
away from heat. Workers should avoid storing or transporting arsenic acid with aluminium, copper, iron, or zinc.
Vorsichtsma?nahmen
Occupational workers should be extremely careful and cautious during handling and use
of arsenic acid.
Arsensure Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
