SU588187A1 - Method of chromium concentration - Google Patents

Description

one

The invention relates to the field of analytical chemistry and other areas where the need arises for maximum and selective concentrated chromium from large volumes of aqueous solutions.

Methods are known for the extraction concentration of chromium with oxygen-containing extractants, which include diancycyrylmethane 1. The disadvantage of the known methods is the low degree of concentration.

The closest to the described invention by its technical essence and the achieved result. The method is the method of separating chromium from hydrochloric acid solutions using chloroform solution of dianthiiryl methane 2. The known method uses hydrochloric acid aqueous solutions and compounds of diantipyrylmethane group. The known method is characterized by a low degree of concentration, since it is carried out using a two-phase system (an aqueous extractant solution, where the ratio of phase volumes is 5: 1. The increase in the ratio between phase volumes to 100: 1 or 1000: 1 is associated with great technical difficulties. or it is not possible at all because of the mutual dissolution of the phases.

To increase the degree of concentration of the proposed method as a reagent

use hezztyldianthipyryl: sodium, and extraction is carried out from 1-6 and. a solution of hydrochloric acid with a mixture of chloroform and a noniolar solvent, for example isooctane. 93-96% chromium is concentrated in the third phase of 1 n. HCI solution when used as a complexing agent heptyl diantipyrylmethane, and as a solvent a mixture of chloroform and isooctane in a ratio of 1: -

2. The choice of non-polar solvents that stratify the organic phase was made on the basis of theoretical studies by the methods of physicochemical analysis of extraction systems with diantipyrylmethaneamps.

The sensitivity and accuracy of the subsequent methods for determining chromium depends precisely on the separation factors for chromium and other elements. Sensitivity of chromium in the third phase can be achieved by Becb: via

high by concentrating the last of the ultra-dilute aqueous solutions. The degree of chromium concentration is very high (90%) in a very wide concentration range (from g to mg) and does not depend on

subsequent method of determining it.

Irimer. To 0.5 l of a solution containing 10 mg of chromium (VI), with acidity of 1-2 n. HCl and 0.5% ammonium chloride are added 10 ml of a 4% solution of reagent in chloroform and shaken for 20 minutes. Then to extract

20 ml of isooctane are poured and, after stirring, the doiuyu phase is selected for analysis using known methods, and, for example, by direct methods. To do this, apply the dioid phase to the electrodes and remove the surface.

Claims (2)

1. The process of koniyitriroviya chromium by extracting it from a hydrochloric acid solution with organic solvents in the presence of organic reagent from a series of diaitaipyrin produced, preferentially used for the subsequent and its analytical oiredelein, different leM, which in order to increase the profile of the same product aspirant aspirant. and extraction is carried out from 1-6 n. hydrochloric acid solution with a mixture of chloroform and the solvent. 2. The method according to and. 1, characterized in that isooctane is used as a non-polar solvent. Sources of information taken into account in the examination 1. Goto, N., Kakita, J., Furukawa, T. J, Chem, Soc, Japan, Pure, Chem, Sec. 79, 12, 1520, 1958. 2. Miiii A. A., Milyutina L. L. Uch. zap Permsky-ui-ta, 141, 241, 1966.