C16H13AsN2O11S2
548.3 g/mol
Research ReagentDanger
Arsenazo I
CAS520-10-5EC208-285-5
Category
Research Reagent
Compound Class
Organic Acid
Primary Use
Research Compound
Arsenazo I is a metallochromic dye reagent used primarily for the detection of calcium ions. It functions as a sensitive indicator in analytical chemistry for metal ion determination.
Calcium-sensitive reagentMetallochromic indicator for metal ion detection
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:EU REACH Restriction List
CAS 520-10-5
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Safety Reference
Danger
H301Toxic if swallowed
H331Toxic if inhaled
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects
H311Toxic in contact with skin
Regulatory Compliance1
- EU REACH Restriction ListEURegulationRestrictedSource
Customs Tariff Classification
The international HS code for Arsenazo I (CAS 520-10-5) is 2931.90.
HS code (international, 6-digit)
2931.90
EU CN code (8-digit)
2931 90 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
3-[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid
InChIKey
NJZWLEZSGOTSHR-UHFFFAOYSA-N
SMILES
C1=CC=C(C(=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)O)O)[As](=O)(O)O
Synonyms (7)
- Arsenazo I