1.10107

Arsenazo III

metal indicator

• Synonym(s): Arsenazo III, 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthaline-3,6-disulfonic acid
• Empirical Formula (Hill Notation): C₂₂H₁₈As₂N₄O₁₄S₂
• CAS Number: 1668-00-4
• Molecular Weight: 776.37
• MDL number: MFCD00036695
• UNSPSC Code: 12352103
• EC Index Number: 216-788-6
• NACRES: NA.21

Properties

• product name: Arsenazo III, metal indicator
• Quality Level: 200
• form: solid
• loss: ≤10% loss on drying, 110°C
• pH: 2.3 (20 °C, 10 g/L in H₂O)
• bulk density: 850 kg/m³
• λmax: 569-576 nm (buffer pH 10.0)
• storage temp.: 2-30°C
• 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)
• InChI key: UQHVTNUJRKELCE-UHFFFAOYSA-N

Description

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ_max. (buffer pH 10.0): 569 - 576 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.025 g/l; buffer pH 10.0; calculated on dried substance): 300 - 450
Loss on drying (110 °C): ≤ 10 %
Suitability as indicator: passes test

Safety Information

• pictograms: GHS06,GHS09
• signalword: Danger
• hcodes: H301 + H331 - H410
• pcodes: P261 - P264 - P270 - P273 - P301 + P310 - P304 + P340 + P311
• Hazard Classifications: Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1
• Storage Class: 6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• wgk_germany: WGK 3