English Name: cpa- Ⅲ; Chlorophosphonazo Ⅲ； 3,6-Bis[(4-chloro-2-phosphonophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulphonic acid

Other names: Chlorophosphonazo Ⅲ; 2,7-bis (4-chloro-2-phosphine carboxyphenylazo) - 1,8-dihydroxynaphthalene-3,6-disulfonic acid; Chlorophosphonic acid azo III

CAS No.: 1914-99-4

C22H16Cl2N4O14P2S2•4H2O=801.33

Grade: Developer

Sensitivity test for rare earth metals: acceptable

Water dissolution test: qualified

Physicochemical Properties: purple brown crystalline powder. Soluble in water, slightly soluble in ethanol and acetone, insoluble in ether, benzene, chloroform and carbon tetrachloride. It is rose red in the aqueous solution with pH < 3, rose red with purple in the aqueous solution with ph=3, and turns purple when pH > 4. It is light green in concentrated sulfuric acid. Decompose in concentrated nitric acid. It is light blue in sodium hydroxide and sodium carbonate solution. The molar absorption coefficient is 74500 ~ 75500, which has higher complexation performance than arsine I.

Purpose: biochemical research. Spectrophotometric Determination of uranium and calcium. It can form colored complexes with calcium, barium, magnesium, copper, zinc, lead, iron, cobalt, nickel, beryllium, aluminum, yttrium, thorium, cerium and ammonium under different conditions

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