Molekula
Arsenazo III >95%
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Arsenazo III is a highly selective chromogenic reagent primarily used for the spectrophotometric determination of metals such as thorium, uranium, zirconium, rare earth elements, and calcium. It forms intensely colored complexes, enabling precise analytical measurements in environmental, clinical, and industrial testing. This product has a purity of over 95%, a CAS number of 1668-00-4, and a molecular formula of C22H18As2N4O14S2 with a molecular weight of 776.37. It should be stored at ambient conditions and handled with caution, as it carries a "Danger" signal word. Molekula supplies Arsenazo III from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90033712 |
| CAS Number | 1668-00-4 |
| IUPAC Name | 3,6-bis[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid |
| EC Number | 216-788-6 |
| Molecular Formula | C22H18As2N4O14S2 |
| Molecular Weight | 776.37 |
| Exact Mass | 775.8693 |
| SMILES | C1=CC=C(C(=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)N=NC4=CC=CC=C4[As](=O)(O)O)O)O)[As](=O)(O)O |
| InChIKey | UQHVTNUJRKELCE-UHFFFAOYSA-N |
| InChI | InChI=1S/C22H18As2N4O14S2/c29-21-18-11(9-16(43(37,38)39)19(21)27-25-14-7-3-1-5-12(14)23(31,32)33)10-17(44(40,41)42)20(22(18)30)28-26-15-8-4-2-6-13(15)24(34,35)36/h1-10,29-30H,(H2,31,32,33)(H2,34,35,36)(H,37,38,39)(H,40,41,42) |
| PubChem CID | 135445682 |
| UN Number | UN3465 |
| REACH Code | Y110 |
| HTS Code | 29319030 |
| Tariff Code | 2931900090 |
Safety & GHS
-
Toxic
GHS06
-
Hazardous to the Environment
GHS09
Hazard statements
- H301 + H331 Toxic if swallowed or inhaled
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P304+312 IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell
- P501 Dispose of contents/container to an approved waste disposal plant
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid
- 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic Acid
- 2,7-Naphthalenedisulfonic acid, 3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-
- 3,6-bis[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid
- Arsenazo cento
- Arsenazo III free acid high grade
- Arsenazo III sodium salt
- C22H18As2N4O14S2
- starbld0016539
- UQHVTNUJRKELCE-UHFFFAOYSA-N
Frequently asked questions
What is Arsenazo III primarily used for?
Arsenazo III is commonly used as an analytical reagent for the spectrophotometric determination of calcium, magnesium, and other metal ions in solution.
What is the chemical formula and molecular weight of Arsenazo III?
The chemical formula is C₂₂H₁₈As₂N₄O₁₄S₂, and the molecular weight is 776.37 g/mol.
How should Arsenazo III be stored?
Store Arsenazo III at ambient temperature in a tightly sealed container, away from moisture and direct sunlight.
What purity grade is available for Arsenazo III?
Molekula supplies Arsenazo III at a purity of ≥95%.
Can Molekula supply Arsenazo III in bulk quantities?
Yes, Arsenazo III is available in bulk quantities—please contact us for specific packaging options and minimum order quantities.
What documentation comes with an order of Arsenazo III?
Each order includes a Certificate of Analysis (CoA), Safety Data Sheet (SDS), and a product specification sheet.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.