Arsenazo III
Agent Name
Arsenazo III
CAS Number
62337-00-2
Formula
C22-H18-As2-N4-O14-S2.2Na
Major Category
Metals
Synonyms
Disodium 3,6-bis((o-arsonophenyl)azo)-4,5-dihydroxynaphthalene-2,7-disulphonate; [ChemIDplus]
Category
Arsenic Compounds, Organic
Description
Purple to black powder; [MSDSonline]
Sources/Uses
"Metal indicators are organic compounds that form specifically colored metal ion complexes in aqueous media. These dye reactions can be employed for detection of the equivalence point in volumetry (complexometry), as well as for concentration determinations in colorimetry or photometry." Arsenazo III is used for the complexometric determination of lanthanides, Th, and Y. It is used for the photometric determination of lanthanides, Sc, Th, U, Y, and Zr. [Ullmann]
Comments
An organic arsenic compound that is toxic by inhalation or ingestion; A skin irritant; [MSDSonline] "Almost nothing is known regarding health effects of organic arsenic compounds in humans. Studies in animals show that some simple organic arsenic compounds are less toxic than inorganic forms. Ingestion of methyl and dimethyl compounds can cause diarrhea and damage to the kidneys." [ATSDR ToxProfiles]
Biomedical References
Exposure Assessment
PEL (OSHA)
0.5 mg/m3, as As
Explanatory Notes
ERG Guide #151 is for UN3280 (organoarsenic compound);
NFPA
must be preheated
Diseases, Processes, and Activities Linked to This Agent
Other Information
No other related information on this agent was found.