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LC504 Arsenazo III

metal indicator


Order number Packaging Quantity Price €
AC27504 Glass bottle 5 g 245.70


Product information
Synonyms 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthaline-3,6-disulfonic acid
Hill Formula C22H18As2N4O14S2
Chemical formula C6H14N4O2*HCl
HS Code 2931 00 99
EC number 216-788-6
Molar mass 776.36 g/mol
EC index number 033-002-00-5
CAS number 1668-00-4


Chemical and physical data

Solubility (20 °C) slightly soluble
Molar mass 776.36 g/mol
Bulk density 850 kg/m3
pH value 2.3 (10 g/l, H2O, 20 °C)


Safety information according to GHS
Hazard Statement(s) H331: Toxic if inhaled.
H301: Toxic if swallowed.
H410: Very toxic to aquatic life with long lasting effects.
Precautionary Statement(s) P273: Avoid release to the environment.
Signal Word Danger
Hazard Pictogram(s)
Storage class 6.1A Combustible substances, toxic
WGK WGK 3 highly water endangering
Disposal 15
Heavy metal-containing solutions and solids: container E. Stir Raney nickel (also: Urushibara nickel) in the form of an aqueous suspension into hydrochloric acid (Cat. No. 100312) until dissolved (container E). Neither Raney nickel itself nor any filter residues should be allowed to dry out, otherwise they will spontaneously ignite in air. In this context, heavy metal means any compound of antimony, arsenic, cadmium, chromium(VI), copper, lead, nickel and tin, as well as these subtances in metallic form, if they are classified as hazardous (acc. to AbfallverzeichnisV – Waste Catalogue Ordinance, Appendix 3). Other heavy metals should be collected separately.


Safety information
R Phrase R 23/25-50/53
Toxic by inhalation and if swallowed.Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
S Phrase S 20/21-28-45-60-61
When using do not eat, drink or smoke.After contact with skin, wash immediately with plenty of water.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).This material and its container must be disposed of as hazardous waste.Avoid release to the environment. Refer to special instructions/ Safety data sheets.
Categories of danger toxic, dangerous for the environment
Hazard Symbol Toxic
Dangerous for the environment


Transport information
Declaration (transport by sea) IMDG-Code UN 3465 ORGANOARSENIC COMPOUND, SOLID, N.O.S.(ARSENAZO III), 6.1, II
Declaration (transport by air) IATA-DGR UN 3465 ORGANOARSENIC COMPOUND, SOLID, N.O.S.(ARSENAZO III), 6.1, II


Identity (UV/VIS-Spectrum) passes test
Absorption maximum λ max (buffer pH 10.0) 571 – 576 nm
Spec. Absorptivity A 1%/1cm (λ7m7ax; 0.0025 %; buffer pH 10.0; calculated on anhydrous substance) 300 – 450
Loss on drying (110 °C) ≤ 10 %
Suitability as indicator passes test


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