Molekula
Arsenazo I
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 I is a chromogenic reagent used in analytical chemistry for the detection and quantification of metal ions, particularly rare earth elements and calcium. It functions as a colorimetric indicator in complexometric titrations. Available with CAS number 66019-20-3, molecular formula C16H10AsN2Na3O11S2, and molecular weight 614.28 g/mol. Stored at ambient temperature. Hazard classification includes signal word Danger. Molekula supplies Arsenazo I 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.
-
1 g — £62.10 per pack ex VAT · £74.52 inc. VAT
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
| Property | Value |
|---|---|
| Appearance | Brown to red powder |
| Assay | 80% min |
| Residue on Ignition | 26% max |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 66833597 |
| CAS Number | 66019-20-3 |
| IUPAC Name | trisodium;4,5-dihydroxy-3-[[2-[hydroxy(oxido)arsoryl]phenyl]diazenyl]naphthalene-2,7-disulfonate |
| EC Number | 266-069-6 |
| Molecular Formula | C16H10AsN2Na3O11S2 |
| Molecular Weight | 614.28 |
| Exact Mass | 613.8635 |
| SMILES | C1=CC=C(C(=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)[As](=O)(O)[O-].[Na+].[Na+].[Na+] |
| InChIKey | NBVFGAJJMPGDDH-UHFFFAOYSA-K |
| InChI | InChI=1S/C16H13AsN2O11S2.3Na/c20-12-7-9(31(25,26)27)5-8-6-13(32(28,29)30)15(16(21)14(8)12)19-18-11-4-2-1-3-10(11)17(22,23)24;;;/h1-7,20-21H,(H2,22,23,24)(H,25,26,27)(H,28,29,30);;;/q;3*+1/p-3 |
| PubChem CID | 2723811 |
| UN Number | UN3465 |
| REACH Code | Y110 |
| Tariff Code | 2931900090 |
Safety & GHS
-
Toxic
GHS06
-
Hazardous to the Environment
GHS09
Hazard statements
- H301 + H311 + H331 Toxic if swallowed, in contact with skin or if 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
- P302+352 IF ON SKIN: Wash with soap and water
- P315 Get immediate medical advice/attention
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
- Arsenazo I hydrate
- Arsenazo i trisodium salt
- Trisodium 3-((o-arsonatophenyl)azo)-4,5-dihydroxynaphthalene-2,7-disulphonate
Frequently asked questions
What is Arsenazo I used for?
Arsenazo I is primarily used as a chromogenic reagent in analytical chemistry for the detection and quantification of metal ions, particularly rare earth elements and calcium.
What is the chemical formula and molecular weight of Arsenazo I?
The formula is C16H10AsN2Na3O11S2 with a molecular weight of 614.28 g/mol.
How should Arsenazo I be stored?
Store at ambient temperature; keep in a cool, dry place away from incompatible materials.
What grade of Arsenazo I is available?
Available in analytical grade; please confirm specific purity and form upon request.
Can Molekula supply Arsenazo I in bulk?
Yes, Molekula can supply Arsenazo I in bulk quantities—contact us for pricing and availability.
What documentation comes with an order of Arsenazo I?
Each order includes a Certificate of Analysis (CoA); Safety Data Sheet (SDS) is available upon request.
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.