o-Cresolphthalein complexon/Me-talphthalein I/o-Cresolphthalexon/Phthalein purple

English Name:o-Cresolphthalein complexon；Me-talphthalein I；o-Cresolphthalexon；Phthalein purple；Phthalein complexone；o-Cresolphthalein di(methylaminodiacetic acid)

Other names: n, n'-[(3-oxo-1 (3H) - isobenzofuranyl] bis [(6-hydroxy-5-methyl-3,1-phenylene) methylene] bis [n- (carboxymethyl) glycine]; Phthalein violet; Metal phthalide; Phenolphthalein violet; 2-cresol phthalein complexing agent; 3', 3' '- bis [[bis (carboxymethyl) amino] methyl] -5', 5 '' - dimethylphenolphthalein

CAS No.: 2411-89-4

C32H32N2O12=636.61

Grade: ar

Content (spectrophotometry): ≥ 80.0%

Sensitivity: acceptable

Water dissolution test: qualified

Free toluene phenolphthalein: acceptable

Organic impurities: acceptable

Burning residue (calculated by sulfate): ≤ 1.0%

Physicochemical Properties: white to brownish crystalline powder. Unstable to heat. Soluble in water, insoluble in ethanol and ether. Colorless alkali solution can be complexed with calcium, strontium and barium salts to form purple or crimson, which is pink when complexed with magnesium, and colorless when complexed with heavy metals. Melting point 181 ~ 185 ℃ (decomposition). The maximum absorption wavelength is 575 (377) nm. Products also contain aqueous sodium salt and light pink powder. Soluble in water, insoluble in ethanol

Purpose: biochemical research. Complexometric titration indicator for the determination of calcium, strontium, barium, magnesium and cadmium

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