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Benzenearsonic acid

  • Name Benzenearsonic acid
  • EINECSN/A
  • CAS No. 98-05-5
  • Densityg/cm3
  • PSA57.53000
  • LogP-0.75240
  • Solubility31.6g/L(28 oC)
  • Melting Point160 °C
  • FormulaC6H7 As O3
  • Boiling Point438.2°Cat760mmHg
  • Molecular Weight202.041
  • Flash Point232.9°C
  • Transport InformationN/A
  • Appearancewhite to slightly yellow crystalline powder
  • SafetyA deadly poison by ingestion and intravenous routes. See also ARSENIC COMPOUNDS. When heated to decomposition it emits toxic fumes of As.
  • Risk Codes50/53-23/25
  • Molecular Structure
    Molecular Structure of 98-05-5 (PHENYLARSONIC ACID)
  • Hazard SymbolsToxic by ingestion.
  • SynonymsToxic by ingestion.
  • Article Data41

Benzenearsonic acid Chemical Properties

Product Name: Benzenearsonic acid (CAS NO.98-05-5)


Molecular Formula: C6H7AsO3
Molecular Weight: 202.04g/mol
Mol File: 98-05-5.mol
Einecs: 202-631-9
Appearance: Colourless solid
Melting Point: 154–158 °C
Boiling point: 438.2 °C at 760 mmHg
Storage Temperature:
Flash Point: 232.9 °C
Density: 1,76 g/cm3
Enthalpy of Vaporization: 73.25 kJ/mol
Vapour Pressure: 1.88E-08 mmHg at 25°C
H-Bond Donor: 2
H-Bond Acceptor: 3
Structure Descriptors of Benzenearsonic acid (CAS NO.98-05-5):
  IUPAC Name: phenylarsonic acid
  Canonical SMILES: C1=CC=C(C=C1)[As](=O)(O)O
  InChI: InChI=1S/C6H7AsO3/c8-7(9,10)6-4-2-1-3-5-6/h1-5H,(H2,8,9,10) 
  InChIKey: LVKZSFMYNWRPJX-UHFFFAOYSA-N
Product Categories: Organometallics; As (Arsenic) Compounds; Classes of Metal Compounds; Semimetal Compounds

Benzenearsonic acid Uses

Several derivatives of Benzenearsonic acid (CAS NO.98-05-5) have been used as additives for animal feeds. These include 4-hydroxy-3-nitrobenzenearsonic acid (3-NHPAA, or Roxarsone), p-arsanilic acid (p-ASA), 4-nitrophenylarsonic acid (4-NPAA), and p-ureidophenylarsonic acid (p-UPAA).

Benzenearsonic acid Production

PhAsO3H2 can be prepared in several routes, but a common one entails treatment of phenyl diazonium salts with sodium arsenite (prepared from arsenious acid and base) in the presence of a copper(II) catalyst.
C6H5N2+ + NaAsO3H2 → C6H5AsO3H2 + Na+ + N2
Related derivatives are prepared similarly. It was first prepared by Michaelis and Loenser.X-ray crystallography indicates that the molecules are connected by hydrogen-bonds consistent with short distance of 2.5 Å separating the oxygen atoms. The arsenic center is tetrahedral.

Benzenearsonic acid Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 oral 270ug/kg (0.27mg/kg)   Compilation of LD50 Values of New Drugs.
rabbit LD50 intravenous 16mg/kg (16mg/kg)   Journal of Pharmacology and Experimental Therapeutics. Vol. 80, Pg. 93, 1944.
rat LDLo oral 50mg/kg (50mg/kg)   Journal of Pharmacology and Experimental Therapeutics. Vol. 93, Pg. 287, 1948.

Benzenearsonic acid Consensus Reports

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

Benzenearsonic acid Safety Profile

A deadly poison by ingestion and intravenous routes. See also ARSENIC COMPOUNDS. When heated to decomposition it emits toxic fumes of As.
Safety Information of Benzenearsonic acid (CAS NO.98-05-5):
Hazard Codes: NDangerous-TToxic
Risk Statements: 50/53-23/25
23:  Toxic by inhalation 
25:  Toxic if swallowed 
50:  Very Toxic to aquatic organisms 
53:  May cause long-term adverse effects in the aquatic environment 
Safety Statements: 61-60-45-28A-20/21
21:  When using, do not smoke 
22:  Do not breathe dust 
28:  After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) 
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
60:  This material and/or its container must be disposed of as hazardous waste 
61:  Avoid release to the environment. Refer to special instructions safety data sheet 

Benzenearsonic acid Standards and Recommendations

OSHA PEL: TWA 0.5 mg/(As)m3
ACGIH TLV: BEI: 35 μ (As)/L inorganic arsenic and methylated metabolites in urine

Benzenearsonic acid Specification

 Benzenearsonic acid ,its CAS NO. is 98-05-5,the synonyms is Arsonic acid, phenyl- ; BRN 2935741 ; EINECS 202-631-9 ; HSDB 6381 ; Kyselina benzenarsonova ; Monophenylarsonic acid ; NSC 15566 ; Phenylarsonic acid .

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