Tmic
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Record Information
Version1.0
Creation Date2009-03-06 18:58:26 UTC
Update Date2016-11-09 01:08:12 UTC
Accession NumberCHEM000236
Identification
Common NameArsenous acid
ClassSmall Molecule
DescriptionArsenous acid is a chemical compound of arsenic. It is the hydrolyzed form of arsenic trioxide and is found in aqueous solutions. Arsenic is a chemical element that has the symbol As and atomic number 33. It is a poisonous metalloid that has many allotropic forms: yellow (molecular non-metallic) and several black and grey forms (metalloids) are a few that are seen. Three metalloidal forms of arsenic with different crystal structures are found free in nature (the minerals arsenopyrite and the much rarer arsenolamprite and pararsenolamprite), but it is more commonly found as a compound with other elements. (3, 9)
Contaminant Sources
  • IARC Carcinogens Group 1
  • T3DB toxins
Contaminant Type
  • Arsenic Compound
  • Food Toxin
  • Inorganic Compound
  • Metalloid
  • Pesticide
  • Pollutant
  • Synthetic Compound
Chemical Structure
Thumb
Synonyms
ValueSource
[As(OH)3]ChEBI
Arsenic trioxideChEBI
Arsorous acidChEBI
As(OH)3ChEBI
H3AsO3ChEBI
TRIHYDROXYARSENITE(III)ChEBI
Chemical FormulaAsH3O3
Average Molecular Mass125.944 g/mol
Monoisotopic Mass125.930 g/mol
CAS Registry Number13464-58-9
IUPAC Namearsorous acid
Traditional Namearsenite
SMILESO[As](O)O
InChI IdentifierInChI=1S/AsH3O3/c2-1(3)4/h2-4H
InChI KeyGCPXMJHSNVMWNM-UHFFFAOYSA-N
Chemical Taxonomy
Description belongs to the class of inorganic compounds known as miscellaneous arsenites. These are inorganic compounds in which the largest metallic oxoanion is arsenite, to which either no atom or a non metal atom is bonded.
KingdomInorganic compounds
Super ClassMixed metal/non-metal compounds
ClassMiscellaneous mixed metal/non-metals
Sub ClassMiscellaneous metallic oxoanionic compounds
Direct ParentMiscellaneous arsenites
Alternative Parents
Substituents
  • Arsenite
  • Trivalent inorganic arsenic compound
  • Inorganic salt
  • Inorganic metalloid salt
  • Inorganic arsenic compound
Molecular FrameworkNot Available
External Descriptors
Biological Properties
StatusDetected and Not Quantified
OriginExogenous
Cellular Locations
  • Cytoplasm
  • Extracellular
Biofluid LocationsNot Available
Tissue LocationsNot Available
PathwaysNot Available
ApplicationsNot Available
Biological RolesNot Available
Chemical RolesNot Available
Physical Properties
StateSolid
AppearanceWhite crystals.
Experimental Properties
PropertyValue
Melting PointNot Available
Boiling PointNot Available
SolubilityNot Available
Predicted Properties
PropertyValueSource
logP-0.86ChemAxon
pKa (Strongest Acidic)6.84ChemAxon
pKa (Strongest Basic)-6.2ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area60.69 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity7.69 m³·mol⁻¹ChemAxon
Polarizability6.27 ųChemAxon
Number of Rings0ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-004i-0900000000-26c04713335c396980e7View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-004i-0900000000-982efae6163f8706efe3View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-004i-1900000000-1ccde29b5404c5ce889bView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-00di-0900000000-362cd1f7701cf877d421View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-00di-1900000000-2bdaffd6d6a5f68f6df3View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-00di-0900000000-734f18bf77d9e82629a2View in MoNA
Toxicity Profile
Route of ExposureOral (4) ; inhalation (4); dermal (4)
Mechanism of ToxicityArsenic and its metabolites disrupt ATP production through several mechanisms. At the level of the citric acid cycle, arsenic inhibits pyruvate dehydrogenase and by competing with phosphate it uncouples oxidative phosphorylation, thus inhibiting energy-linked reduction of NAD+, mitochondrial respiration, and ATP synthesis. Hydrogen peroxide production is also increased, which might form reactive oxygen species and oxidative stress. Arsenic's carginogenicity is influenced by the arsenical binding of tubulin, which results in aneuploidy, polyploidy and mitotic arrests. The binding of other arsenic protein targets may also cause altered DNA repair enzyme activity, altered DNA methylation patterns and cell proliferation. (2, 1)
MetabolismArsenic is absorbed mainly by inhalation or ingestion, as to a lesser extent, dermal exposure. It is then distributed throughout the body, where it is reduced into arsenite if necessary, then methylated into monomethylarsenic (MMA) and dimethylarsenic acid (DMA) by arsenite methyltransferase. Arsenic and its metabolites are primarily excreted in the urine. Arsenic is known to induce the metal-binding protein metallothionein, which decreases the toxic effects of arsenic and other metals by binding them and making them biologically inactive, as well as acting as an antioxidant. (5)
Toxicity ValuesLD50: 41 mg/kg (Oral, Rat) (10) LD50: 12 mg/kg (Oral, Rabbit) (10) LD50: 150 mg/kg (Dermal, Rat) (10)
Lethal DoseNot Available
Carcinogenicity (IARC Classification)1, carcinogenic to humans. (8)
Uses/SourcesArsenic and its compounds are used in pesticides, wood preservatives, paints/pigments, and various metal alloys (electronics). Small amounts of arensic can be found in contaminated air, water, and some meat products, especially seafood. (4)
Minimum Risk LevelAcute Oral: 0.005 mg/kg/day (7) Chronic Oral: 0.0003 mg/kg/day (7) Chronic Inhalation: 0.01 mg/m3 (7)
Health EffectsArsenic poisoning can lead to death from multi-system organ failure, probably from necrotic cell death, not apoptosis. Arsenic is also a known carcinogen, esepcially in skin, liver, bladder and lung cancers. (2, 5)
SymptomsExposure to lower levels of arsenic can cause nausea and vomiting, decreased production of red and white blood cells, abnormal heart rhythm, damage to blood vessels, and a sensation of "pins and needles" in hands and feet.
TreatmentArsenic poisoning can be treated by chelation therapy, using chelating agents such as dimercaprol, EDTA or DMSA. Charcoal tablets may also be used for less severe cases. In addition, maintaining a diet high in sulfur helps eliminate arsenic from the body. (5)
Concentrations
Not Available
DrugBank IDDB04456
HMDB IDHMDB0011620
FooDB IDFDB028324
Phenol Explorer IDNot Available
KNApSAcK IDNot Available
BiGG IDNot Available
BioCyc IDNot Available
METLIN IDNot Available
PDB IDNot Available
Wikipedia LinkArsenous acid
Chemspider IDNot Available
ChEBI ID49900
PubChem Compound ID545
Kegg Compound IDNot Available
YMDB IDNot Available
ECMDB IDECMDB21309
References
Synthesis ReferenceNot Available
MSDSNot Available
General ReferencesNot Available