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SPADNS

Product Name
SPADNS
CAS No.
23647-14-5
Chemical Name
SPADNS
Synonyms
SPADNS;SpadnsGr;SPADNS reagent;SPADNS SOLUTION;SPADNS extrapure AR;SPADNS, Reagent, ACS;SPADNS extrapure AR, ACS;2,7-naphthalenedisulfonic;Sulfanilic acid azochromtrop;SULFANILIC ACID-AZOCHROMOTROP
CBNumber
CB8205751
Molecular Formula
C16H13N2NaO11S3
Formula Weight
528.45
MOL File
23647-14-5.mol
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SPADNS Property

Melting point:
>300°C
bulk density
810kg/m3
storage temp. 
Store at +15°C to +25°C.
solubility 
220g/l
form 
Crystalline Powder
color 
Dark red-brown
PH
6.0 (10g/l, H2O, 22℃)
Water Solubility 
Soluble in water (10 mg/ml), and ethanol (1 mg/ml). very slightly soluble or insoluble in alcohol and organic solvents.
λmax
505-510 nm
EPA Substance Registry System
2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-[(4-sulfophenyl)azo]-, trisodium salt (23647-14-5)
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Safety

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36
WGK Germany 
3
TSCA 
Yes
HS Code 
2927 00 00
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P405Store locked up.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
S9256
Product name
Sulfanilic acid azochromotrop
Purity
≥80%
Packaging
10g
Price
$63
Updated
2025/07/31
Sigma-Aldrich
Product number
S9256
Product name
Sulfanilic acid azochromotrop
Purity
≥80%
Packaging
25g
Price
$128.93
Updated
2025/07/31
Sigma-Aldrich
Product number
1.07998
Product name
1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6- disulfonic acid trisodium salt
Purity
GR for analysis (reagent for fluoride, zirconium, thorium)
Packaging
25g
Price
$256
Updated
2025/07/31
TCI Chemical
Product number
D0604
Product name
Trisodium 2-(4-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate Hydrate
Purity
>95.0%(HPLC)
Packaging
5g
Price
$85
Updated
2025/07/31
TCI Chemical
Product number
D0604
Product name
Trisodium 2-(4-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate Hydrate
Purity
>95.0%(HPLC)
Packaging
25g
Price
$247
Updated
2025/07/31
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SPADNS Chemical Properties,Usage,Production

Chemical Properties

dark red-brown crystalline powder

Uses

Sulfanilic acid azochromotrop is used as an indicator for complexometric determinations of zirconium and thorium. It is used as a reagent for drinking and wastewater analysis using Hach Method 8029, Fluoride, SPADNS Method.

SPADNS Preparation Products And Raw materials

Raw materials

Preparation Products

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SPADNS Suppliers

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View Lastest Price from SPADNS manufacturers

Career Henan Chemical Co
Product
SPADNS 23647-14-5
Price
US $1.00/KG
Min. Order
1KG
Purity
98%
Supply Ability
1kg,5kg,100kg
Release date
2019-08-08

23647-14-5, SPADNSRelated Search:

Trisodium naphthalene-1,3,6-trisulphonate (ETHYLENEDINITRILO)TETRAACETIC ACID, TRISODIUM SALT HYDRATE NITRILOTRIACETIC ACID TRISODIUM SALT MONOHYDRATE N,N-BIS(CARBOXYLATOMETHYL)ALANINE TRISODIUM SALT CHROMOTROPIC ACID DISODIUM SALT 2,7-Naphthalenedisulfonic acid disodium salt Sodium 5-hydroxynaphthalene-1-sulphonate 6-Amino-4-hydroxy-2-naphthalenesulfonic acid Naphthalene-2-sulfonic acid CHROMOTROPIC ACID SODIUM SALT Sulfanilic acid SODIUM SULFANILATE Naphthalene-2,7-disulfonic acid 3-Hydroxythiophenol CHROMOTROPE 2R Disodium 3-aminonaphthalene-2,7-disulphonate 1,8-Dihydroxynaphthylene-3,6-disulfonic acid P-PHENYLAZOBENZENESULFONIC ACID

  • 2-(4-Sulfophenylazo)1,8-dihydroxy-3,6-naphthalenedisulfonic acid, trisodiuM salt, indicator grade 10GR
  • 2-(4-Sulfophenylazo)1,8-dihydroxy-3,6-naphthalenedisulfonic acid, trisodiuM salt, indicator grade 25GR
  • SPADNS 4,5-Dihydroxy-3-(4-sulfophenylazo)-2,7-naphthalenedisulfonic Acid Trisodium Salt Trisodium 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonate 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic Acid Trisodium Salt
  • 1,8-DIHYDROXY-2-(4-SULFOPHENYLAZO)NAPHTH
  • SPADNS, Reagent, ACS
  • 2-(4-Sulfophenylazo)chroMotropic acid trisodiuM salt, indicator
  • 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6- disulfonic acid trisodium salt GR for analysis (reagent for fluoride, zirconium, thorium)
  • SPADNS
  • SULFANILIC ACID-AZOCHROMOTROP
  • SULFANILIC ACID AZOCHROMOTROPE
  • TRISODIUM 2-(4-SULFOPHENYLAZO)-1,8-DIHYDROXYNAPHTHALENE-3,6-DISULFONATE
  • p-Sulfophenylazochromotropic acid trisodium salt
  • Sulphanilic acid azochromotrope~2-(4-Sulphophenylazo)chromotropic acid trisodium salt
  • trisodium 4,5-dihydroxy-3-(4-sulphonatophenylazo)naphthalene-2,7-disulphonate
  • 2(4-SULFOPHENYLAZO)1,8-DIHYDROXY-3,6-NAP HT HALENEDISULFONIC ACID, 3NA SALT,IND
  • SULFANILIC ACID AZOCHROMOTROP FOR &
  • SpadnsGr-(2-(P-SulphophenylAzo)1,8-Dihydroxynaphelene-3,6-DisulphonicAcidTrisodiumSalt)
  • SpadnsGr
  • 1,8-DIHYDROXY-2-(4-SULFOPHENYLAZO)NAPHTHALENE-3,6-DISULFONICACID
  • 2-(4-Sulfophenylazo)1,8-dihydroxy-3,6-naphthalenedisulfonic acid, trisodium salt, indicator grade
  • 4,5-DIHYDROXY-3-(P-SULFOPHENYLAZO)-2,7-NAPHTHALENE DISULFONIC ACID, TRISODIUM SALT
  • 4,5-DIHYDROXY-3-(4-SULFOPHENYLAZO)-2,7-NAPHTHALENEDISULFONIC ACID TRISODIUM SALT
  • 3-(4-SULFOPHENYLAZO)-4,5-DIHYDROXY-2,7-NAPHTHALENEDISULFONIC ACID TRISODIUM SALT
  • 2-(P-SULFOPHENYLAZO)-1,8-DIHYDROXY-3,6-NAPHTHALENEDISULFONIC ACID TRISODIUM SALT
  • 2-(P-SULFOPHENYLAZO)1,8-DIHYDROXY-3,6 NAPHTHALENE TRISODIUM SALT
  • 2-(P-SULFOPHENYLAZO)-1,8-DIHYDROXY-NAPHTHALENE-3,6-DISULFONIC ACID TRISODIUM SALT
  • 2-(4-SULFOPHENYLAZO)-1,8-DIHYDROXY-3,6-NAPHTHALENEDISULFONIC ACID TRISODIUM SALT
  • 2-(p-SULFOPHENYLAZO)-1,8-DIHYDROXY-3,6-NAPH- THALENEDISULFONIC ACID
  • SPADNS SOLUTION
  • 1,8-DIHYDROXY-2-(4-SULFOPHENYLAZO)NAPHTHALENE-3,6-DISULFONIC ACID TRISODIUM SALT
  • 2-(p-Sulfophenylazo)chromotrop
  • 2,7-naphthalenedisulfonic
  • 2,7-naphthalenedisulfonicacid,4,5-dihydroxy-3-((4-sulfophenyl)azo)-,trisodium
  • 2,7-naphthalenedisulfonicacid,4,5-dihydroxy-3-((4-sulfophenyl)azo)-,trisodiumsalt
  • 2,7-Naphthalenedisulfonicacid,4,5-dihydroxy-3-[(4-sulfophenyl)azo]-,trisodiumsalt
  • 7-naphthalenedisulfonicacid,4,5-dihydroxy-3-[(4-sulfophenyl)azo]-trisodiu
  • 1,8-Dihydroxy-2-(4-sulfobenzeneazo)-3,6-naphthalenedisulfonic acid trisodiu
  • 2-(4-SULFOPHENYLAZO)1,8-DIHYDROXY-3,6-NAPHTHALENEDISULFONIC ACID TRISODIUM SALT (SPADNS)
  • Trisodium 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonate
  • Trisodium 2-(4-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate Hydrate
  • 2-(P-SULFOPHENYLAZO)1,8-DIHYDROXY-3,6-NAPHTHALENE
  • 4,5-DIHYDROXY-3-(P-SULFOPHENYLAZO)-2,7-NAPHTHALENEDISULFONIC ACID
  • SPADNS extrapure AR
  • 2-(4-Sulfophenylazo)chromotropic acid trisodium salt, SPADNS, 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic acid trisodium salt, 2-(4-Sulfophenylazo)-1,8-dihydroxy-3,6-naphthalene disulfonic acid trisodium salt
  • 2-(4-Sulfophenylazo)chromotropic acid trisodium salt, SPADNS, Sulfanilic acid azochromotrop, 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic acid trisodium salt
  • 2-(4-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid
  • 3-(4-Sulfophenylazo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid
  • 3-[(4-Sulfophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid
  • 4,5-Dihydroxy-3-(4-sulfophenylazo)naphthalene-2,7-disulfonic acid
  • 4,5-Dihydroxy-3-[(4-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid
  • 3-[[4-(Sodiooxysulfonyl)phenyl]azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid disodium salt
  • Sulfanilic acid azochromtrop
  • 2-(4-Sulfophenylazo)1,8-dihydroxy-3,6-naphthalenedisulfonic acid, trisodium salt,indicator
  • 2-(4-Sulfophenylazo)1,8-dihydroxy-3,6-naphthalenedisulfonic acid
  • SPADNS reagent
  • SPADNS, REAGENT (ACS)SPADNS, REAGENT (ACS)SPADNS, REAGENT (ACS)
  • Trisodium2-(4-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonateHydrate&gt
  • 2-(4-Sulfonylphenyl azochromic acid trisodium salt, indicator