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Name	o-ARSENIC ACID	EINECS	231-901-9
CAS No.	7778-39-4	Density	2.2 g/cm3
PSA	77.76000	LogP	-2.17060
Solubility	16.7 g/100 mL. Soluble.	Melting Point	35 °C
Formula	AsH3 O4	Boiling Point	160 °C
Molecular Weight	141.943	Flash Point	N/A
Transport Information	N/A	Appearance	COLOURLESS VISCOUS HYGROSCOPIC LIQUID
Safety	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.	Risk Codes	N/A
Molecular Structure		Hazard Symbols	N/A
Synonyms	Orthoarsenicacid	Article Data	302

o-ARSENIC ACID Chemical Properties

Product Name: O-arsenic acid (7778-39-4)

Molecular Formula: AsH₃O₄
Molecular Weight: 141.94g/mol
Mol File: 7778-39-4.mol
Appearance: colourless viscous hygroscopic liquid
Melting Point: 35 °C
Boiling point: 160 °C
Water Solubility: 16.7 g/100 mL. Soluble.
Stability: Incompatible with metals
Product Categories: Inorganics
Synonyms of O-arsenic acid (7778-39-4): acidearseniqueliquide ; acidearseniqueliquide(french) ; arsenicacid(h3aso4) ; arsenicacid,[solid] ; arsenicacid,liquid ; arsenicacid,solid ; caswellno056 ; chromatedarsenicals .

o-ARSENIC ACID Toxicity Data With Reference

Ingestion cuases irritation of stomach, weakness, other gastrointestinal symptoms. Overdose O-arsenic acid (7778-39-4) can cause arsenic poisoning, but symptoms are delayed.

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Source
chicken	LDLo	oral	125mg/kg (125mg/kg)	"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
dog	LDLo	oral	10mg/kg (10mg/kg)	"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
pigeon	LDLo	oral	100mg/kg (100mg/kg)	"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
rabbit	LDLo	oral	5mg/kg (5mg/kg)	"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
rat	LD50	oral	48mg/kg (48mg/kg)	Farm Chemicals Handbook. Vol. -, Pg. C27, 1991.

o-ARSENIC ACID Consensus Reports

Reported in EPA TSCA Inventory. Arsenic and its compounds are on the Community Right-To-Know List.

o-ARSENIC ACID Safety Profile

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.
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.

o-ARSENIC ACID Standards and Recommendations

OSHA PEL: TWA 0.01 mg(As)/m³; Cancer Hazard
ACGIH TLV: TWA 0.01 mg/m³; Confirmed Human Carcinogen; BEI: 35 μ (As)/L inorganic arsenic and methylated metabolites in urine
DFG MAK: Human Carcinogen
NIOSH REL: (Arsenic, Inorganic) CL 2 µg(As)/m³/15 M
DOT Classification: 6.1; Label: Poison

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