SU1198003A1 - Method of extracting ferrum (iii) from aqueous solutions - Google Patents

Abstract

METHOD FOR EXTRACTING IRON (III) FROM AQUEOUS SOLUTIONS, including extraction with an organic reagent solution in a solvent, characterized in that benzoyl-4-antipyrine is used as an organic reagent in order to increase the selectivity and to ensure the extraction of macroscopic iron, the ratio of organic and aqueous phases 1: 1-5. (L

Description

with

00 The invention relates to analytical chemistry, in particular, to methods for extracting metal salts from aqueous solutions into organic solvents using organic reagents and can be used in the production of highly pure metals for the selective extraction of iron (III). The purpose of the invention is to increase the selectivity of the method for extracting Fe (1S) and to provide macro quantities of iron. Benzoyl-4-antipyrine is a compound of the structural form SbH5-C-C-0-CH3 O kj j N-NHs The optimal conditions for extracting iron from aqueous solutions are 5-9 M neb, 3-fold excess benzoyl reagent. 4-antipyrine, as an extractant - dichloroethane with the ratio of the volumes of organic and aqueous phases 1: 1-5. The data on the effect of the volume of the aqueous phase on the degree of extraction of the microscopic amounts of jellies under the condition R = 0.05 M in C TfyCfcz, 5 M, VP 20 MP, the extraction time of 7-10 minutes is given in Table. 1. Example 1. The use of an iron (III) extraction method in the extraction-complexometric determination of macroquantities of iron in various bases. The method of determination. An equal volume of a 0.0625 M solution of benzoyl-4-antipyrene in dichloroethane is poured into the analyzed solution containing 525 mg / 20 ml of Fe and 0.5 g in terms of the base metal with acidity of 5-6 M HC8 and extracted for 10 minutes . After settling, the organic phase is filtered, and another 10 ml of solution is added to the aqueous one and the extraction is repeated. In the combined extracts, the iron is completely complexometric. The results obtained (Table 2) show that iron can be determined in bases containing Cu, Co, Ni, Cd, Zn, Mn Cr Sn, Mo, W, with a relative error of determination of 2-4%, i.e. . This method of 3J iron extraction is more selective than known methods. Example 2. Using the method of extracting iron (III) in the extraction-chemical-spectral determination of iron trace amounts, to a solution containing 100 µg of Fe and 0.15 g of a base with an acidity of 5-6 M НСЕ with a total volume of 20 ml of the aqueous phase, A 05 M solution of benzoi, p-4-antipyrine in dichloroethane and extraction of iron with 10 and 5 ml of reagent solution twice. The obtained extracts are quantitatively transferred into the crucible, 2 mp (10 µg) of the solution of the BaCEj element are added, 0.1 g of carbon powder is injected, the solvent is evaporated, and after calcining the contents of the crucible are transferred to a 4 mm carbon electrode and the spectra are photographed on ICP-30 according to the following conditions: DG-2 generator, I 5.5 A, V 180 V, slit width 0.005 mm, analytical gap 2.5 mm, photosensitive plate UFSH 16 units GOST, exposure time 40 s. Analytical pair of lines, nm: Fe-233.8; Ba 234.75; When determining 100 μg of Fe, the standard deviation does not exceed 2.75, and the coefficient of variation is 2.65%. The extraction-chemical-spectral determination of iron from various bases does not interfere with copper, cobalt, nickel, zinc, cadmium, calcium, barium, magnesium, and other elements (see table 3). Example 3. The use of the method of extracting iron (III) in the extraction-chemical-spectral determination of Fe in natural water. In the head, separating funnels were added with 70 ml of natural water, 5-6 M acidity was made according to HCP, and Fe 20 and 10 ml of a 0.0625 M solution of benzoyl 4 antipyrine in dichloethane were extracted twice. The extracts determine the iron content by complexonometry, and 100 µg of Fe are introduced into the aqueous phase and an element of 15 and 10 ml of a 0.05 M solution of the reagent in dichloroethane is extracted. The extracts are transferred to crucibles. After evaporation of the solvent, 50 µg are introduced into one crucible, 100 µg into the other and 200 mg in the third, the contents of the crucibles are dried again and

1198003

four coal fillings are filled. The data of the electrode tester are obtained and the spectra of the reproducibility of the result are photographed.

under the indicated conditions of analysis x (see table 4).

Table 1

11980036

, jr a b l and c a. 3

104.1

100.0 147.0 150.0

Table 4

200.0

192.3 300.0 284.4

Claims (1)

METHOD FOR REMOVING IRON (ITI) FROM AQUEOUS SOLUTIONS, including extraction with a solution of an organic reagent in a solvent, characterized in that, in order to increase selectivity and ensure the extraction of trace amounts of iron, benzoyl-4-antipyrine is used as an organic reagent, and dichloroethane is used as a solvent in the ratio of organic and aqueous phases 1: 1-5. SU ... 1198003>