C16H9N2Na3O11S3
570.4 g/mol
Dye & PigmentWarning
SPADNS
CAS23647-14-5EC245-803-9
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
chromogenic indicator for metal and fluoride ions
SPADNS is a trisodium salt of an azo dye used as a chromogenic indicator in analytical chemistry. It is primarily employed for the spectrophotometric determination of metal ions and fluoride ions in solution.
chromogenic indicator for spectrophotometric determination of metal ionschromogenic indicator for spectrophotometric determination of fluoride ions
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.
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Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for SPADNS (CAS 23647-14-5) is 2927.00.
HS code (international, 6-digit)
2927.00
EU CN code (8-digit)
2927 00 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
trisodium;4,5-dihydroxy-3-[(4-sulfonatophenyl)diazenyl]naphthalene-2,7-disulfonate
InChIKey
AEHGQXKBQBMQEK-UHFFFAOYSA-K
SMILES
C1=CC(=CC=C1N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)S(=O)(=O)[O-].[Na+].[Na+].[Na+]
Synonyms (17)
- SPADNS
- Sulfanilic acid azochromotrop
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