Molekula
Arsenazo III
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 chromogenic reagent used in analytical chemistry for the detection and quantification of metal ions, particularly rare earth elements and calcium. It forms colored complexes with these ions, enabling spectrophotometric analysis. Available with CAS number 1668-00-4, molecular formula C22H18As2N4O14S2, and molecular weight 776.37 g/mol. Stored at ambient temperature. Hazard classification includes signal word Danger. 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £124.50 per pack ex VAT · £149.40 inc. VAT
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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
| Property | Value |
|---|---|
| Appearance | Dark red powder |
| Melting Point | ≥320℃ |
| Residue on Ignition | ≤2% |
| Effective Content | ≥70% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 13331445 |
| 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
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Toxic
GHS06
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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 used for?
Arsenazo III is primarily used as a chromogenic reagent in analytical chemistry for detecting and quantifying metal ions, especially rare earth elements and calcium.
What is the chemical formula and molecular weight of Arsenazo III?
The formula is C22H18As2N4O14S2 with a molecular weight of 776.37 g/mol.
How should Arsenazo III be stored?
Store at ambient temperature, away from light and moisture, and keep in a tightly closed container.
What grade of Arsenazo III does Molekula supply?
Molekula supplies Arsenazo III in analytical grade, suitable for laboratory and research use.
Can Molekula supply Arsenazo III in bulk?
Yes, Molekula can supply Arsenazo III in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an order of Arsenazo III?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) compliant with GHS standards.
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.