Azo violet

Abstract: A non-aqueous titration method was developed to assay the insensitive high explosive 1,1-diamino-2, 2-dinitroethene (FOX-7). The weak acidic nature of FOX-7 (pKa 10.6) was exploited in the assay method. The sample was dissolved in the protophilic solvent N, N-dimethylformamide and titrated against sodium methoxide solution in benzene/methanol using azo violet as indicator. FOX-7 samples obtained from regular batch operations were assayed by this method and the results were compared with that of a recrystallized sample. The method is simple, rapid and has good accuracy and precision.

Abstract: PURPOSE:To secure the safety by employing a nonionic or amphoteric surfactant as dissolution assistant of a color developer and a sulfide compound or a thioureide compound as stabilizing agent in the determination of magnesium using xylyl azo violet. CONSTITUTION:Polyoxyethylene alkyl eter or the like is especially effective as the nonionic surfactant and alkylbetaine as the amphoteric surfactant, where the concentration is pref. 0.005-20.0%. beta-thiodiglycol, thiodiphenylamine or the like is used as the sulfide compound, where the amount of addition is pref. 0.005-2%. These reagents display an effective action near the pH of 11 used in the determination as well and can be used for at least 2 years by preserving it at 40 deg.C. The stabilizing effect of the color developing agent also serves to stabilize the color reaction, especially, that of the standard and the serum employing the stabilzing agent, keeping the color reaction unchanged for at least 3 days.

Abstract: The invention discloses an azo violet functionalized silicon gel and a preparation method thereof, and a method for purifying water by using the azo violet functionalized silicon gel. The silicon gel is an azo violet functionalized silicon gel. The preparation method comprises the following steps of: 1, soaking the silicon gel with the particle size of 60-100mu by using 6 mol/L of HCl, washing with deionized water to be neutral and then drying in a vacuum drying box to obtain activated silicon gel; and 2, placing the activated silicon gel in a three-necked bottle, adding aminopropyltriethoxysilane, benzaldehyde, azo violet and absolute methanol or absolute ethyl alcohol, and stirring at a temperature of 70-80 DEG C for reflux to prepare the azo violet functionalized silicon gel. After the pH of mercury-containing water is regulated to be 5-8, the azo violet functionalized silicon gel is placed in the mercury-containing water for stirring and filtering to obtain water with mercury content of lower than 0.00001mg/L. The method is used for deeply purifying the water with extremely low mercury content.