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Arsenazo III

Arsenazo III

CAS: 1668-00-4

Molecular Formula: C22H18As2N4O14S2

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Arsenazo III - Names and Identifiers

Name Arsenazo III
Synonyms Arsenazo Ⅲ
Arsenazo III
ARSENAZO III, REAG.
ARSENAZO III SODIUM SALT
7-Naphthalenedisulfonicacid,3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-2
2,7-Naphthalenedisulfonicacid,3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-
2,7-(bis(2-arsonophenylazo))-1,8-dihydroxynaphthalene-3,6-disulphonic acid
2,7-bis(2-Arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonicacid,sodiumsalt
2,2'-(1,8-DIHYDROXY-3,6-DISULFO-2,7-NAPHTHALENE-BIS(AZO))DIBENZENEARSONIC ACID SODIUM SALT
(3E,6E)-3,6-bis[(2-arsonophenyl)hydrazono]-4,5-dioxo-3,4,5,6-tetrahydronaphthalene-2,7-disulfonic acid
(3Z,6Z)-3,6-bis[(2-arsonophenyl)hydrazono]-4,5-dioxo-3,4,5,6-tetrahydronaphthalene-2,7-disulfonic acid
disodium (3E,6E)-3,6-bis[(2-arsonophenyl)hydrazono]-4,5-dioxo-3,4,5,6-tetrahydronaphthalene-2,7-disulfonate
CAS 1668-00-4
EINECS 216-788-6
InChI InChI=1/C22H18As2N4O14S2.2Na/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;;/h1-10,25-26H,(H2,31,32,33)(H2,34,35,36)(H,37,38,39)(H,40,41,42);;/q;2*+1/p-2/b27-19-,28-20-;

Arsenazo III - Physico-chemical Properties

Molecular FormulaC22H18As2N4O14S2
Molar Mass776.37
Melting Point>320°C(lit.)
Solubility ammonium hydroxide: soluble1mg/mL
AppearanceDeep purple powder
ColorBrown
BRN5717957
pKa-1.25±0.40(Predicted)
PH2.3 (10g/l, H2O, 20℃)
Storage ConditionStore below +30°C.
SensitiveEasily absorbing moisture
MDLMFCD00036695
UseTest thorium, rare earth metal complex indicator, colorimetric or spectrophotometric determination of actinides, barium, bismuth, calcium, copper, iron, lanthanum, neptunium, palladium, polonium, plutonium, rare earth metals, scandium, thorium, uranium and zirconium.

Arsenazo III - Risk and Safety

Risk CodesR23/25 - Toxic by inhalation and if swallowed.
R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
Safety DescriptionS20/21 -
S28 - After contact with skin, wash immediately with plenty of soap-suds.
S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
S60 - This material and its container must be disposed of as hazardous waste.
S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. 
UN IDsUN 3465 6.1/PG 2
WGK Germany3
HS Code2931 90 00
Hazard Class6.1(b)
Packing GroupIII

Arsenazo III - Nature

Open Data Verified Data

purple-brown powder. Soluble in water, the solution is Rose Red. It is green in concentrated sulfuric acid and blue in alkaline solution.

Last Update：2024-01-02 23:10:35

Arsenazo III - Preparation Method

Open Data Verified Data

O-aminobenzoic acid was added to hydrochloric acid for dissolution, and sodium nitrate solution was added dropwise to prepare a heavy ammonia salt. In addition, disodium chromotropic acid is added to lithium chloride and sodium hydroxide aqueous solution, the above diazonium salt solution and sodium hydroxide solution are added in sequence, and then concentrated hydrochloric acid is added to precipitate, and then dissolved in sodium hydroxide solution, filtered and dried to obtain arsenamide.

Last Update：2025-06-10 22:55:16

Arsenazo III - Introduction

Easily soluble in water, rose-colored in aqueous solution, red in sulfuric acid, and blue in alkaline solution.
Last Update：2022-10-16 17:14:17

Arsenazo III - Application

Open Data Verified Data

sensitive reagents for Colorimetric Determination of uranium, thorium, zirconium, cadmium, zinc, calcium, barium, bismuth and rare earth.

Last Update：2025-08-19 16:24:40

Arsenazo III - Reference Information

Use Used as a sensitive reagent for colorimetric determination of thorium and uranium.
Test thorium, rare earth metal complexation indicator, colorimetric determination or spectroscopic determination Actinides, barium, bismuth, calcium, copper, iron, lanthanum, neptunium, palladium, polonium, plutonium, rare earth metals, scandium, thorium, uranium and zirconium.
Verification of thorium; rare earth metal complexation indicator; colorimetric or spectrophotometric determination of actinides, barium, bismuth, calcium, copper, iron, lanthanum, neptunium, palladium, polonium, plutonium, rare earth metals, scandium, thorium, Uranium and zirconium
production method add o-aminophenylarsonic acid into hydrochloric acid to dissolve, and add sodium nitrate solution drop by drop to prepare diazonium salt. In addition, add disodium chromatic acid to lithium chloride and sodium hydroxide aqueous solution, sequentially add the diazonium salt solution and sodium hydroxide solution above, then add concentrated hydrochloric acid to precipitate, and then dissolve in sodium hydroxide solution, filter, and dry to obtain Arsenazo.
Last Update：2024-04-09 21:01:54
Arsenazo III
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View History
Arsenazo III
复合氨基酸ELHT
Naphthoquine Phosphate
Pigment Red 235
Silver(Ⅰ)Oxide
198220-45-0
C.I.Pigment Red 210
灭黑灵
粘合剂BA
α-石竹烯
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