Agent Name

SPADNS

CAS Number

23647-14-5

Formula

C16-H12-N2-O11-S3.3Na

Major Category

Dyes

Synonyms

2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-((4-sulfophenyl)azo)-, trisodium salt; 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-(2-(4-sulfophenyl)diazenyl)-, sodium salt (1:3); Trisodium 4,5-dihydroxy-3-(4-sulphonatophenylazo)naphthalene-2,7-disulphonate; [ChemIDplus] 4,5-Dihydroxy-3-[2-(4-sulfophenyl)diazenyl]-2,7-naphthalenedisulfonic acid sodium salt (1:3); 4,5-Dihydroxy-3-[(4-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt; 2-(4-Sulfophenylazo)-1,8-dihydroxy-3,6-napthalenedisulfonic acid trisodium salt; Trisodium 2-(p-sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate; [Merck Index] 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic acid trisodium salt; 2-(4-Sulfophenylazo)chromotropic acid trisodium salt; [Sigma-Aldrich MSDS]

Category

Azo Dyes

Description

Red solid; [Merck Index] Dark red powder; [Sigma-Aldrich MSDS]

Sources/Uses

Used as a chromogenic indicator for spectrophotometric determination of metal ions and fluoride ions; [Merck Index]

Comments

An irritant; [Merck Index] A skin and strong eye irritant; [Sigma-Aldrich MSDS]

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