SU1456881A1 - Method of quantitative analysis of ferrotartrate complex in cellulose solvent - Google Patents

Abstract

The invention relates to analytical chemistry, in particular the quantitative determination of the iron – tartrate complex in a cellulose solvent. To simplify the process, the initial sample is treated with mineral acid to pH 1–3, followed by the introduction of another indicator — 4,5-dioxibenzene-1,3-disulfonic acid di-Na-salt — and titration with ethylenedia-aHH-N di-Na-salt , N, N, N-tetraacetic acid. In comparison with the known conditions, these conditions make it possible to eliminate heating and the use of an additional reagent, a glycocol, with a similar accuracy of analysis (0.05 mol / l). 1 tab.

Description

one

The invention relates to the field of analytical chemistry, in particular, to methods for the quantitative determination of the iron – tartrate complex in a cellulose solvent, which is an alkaline solution of the iron – tartaric complex Na, He (з) 11 (solution HLN).

The aim of the invention is to simplify the method.

EXAMPLE 1 10 ml of cellulose solvent with a concentration of the iron-tartrate complex of 0.097 mol / l, 1 K of nitric acid solution are adjusted to pH 1-3, controlled by litmus paper, made up to 50 ml, 8-10 drops of a 10% solution of tyrone (4,5-dioxybenzene-1,3-disulphonic acid disodium salt) are added dropwise and titrated with a 0.05 M solution of Trilon B (ethylenediamine-H disodium salt, K, K, N -tetraacetic acid). The volume of the Trilon B solution, which was titrated, is fixed by the transition of the dark blue color of the solution to lemon yellow. The concentration of iron complex complex is calculated by the formula

R ip pvp

31456881

where C is the concentration of iron-tartrate — the difference is that they take the pro-complex, mol / l; bu 1.0 ml in the amount of concentration C p is the concentration of the solution of the tricycide-iron-tartrate complex

Lona B, mol / l; 0.995 mol / l. The volume of the trilo-V solution is the volume of the Trilon B solution, per B, followed by titration, half-titrated, ml, and equal to 19.8 ml. Substituting in for-PP - the volume of the sample studied is a page value of 0.05 mol / l; V.

cellulose solvent, ml. 1.0 ml and 19.8 ml, a con, Q, 10 concentration of iron-tartrate complex with 0.05 mol / l - ----- sa CK 0.990 mol / l is obtained. О 097 mol / l. Examples on the quantitative determination. Example 2. For the quantitative treatment of the iron – tartrate complex in

for the determination of iron – tartar com-cellulose solvent are given in

plexus in cellulose solvent

Water titration is analogous to the example. solvent examples

The difference is that taking pro-cellulose is prepared with a given concentrate in an amount of 3 ml with a concentration P of the iron-tartrate complex,

a complex of iron-tartrate complex, which was additionally carried out with a spectrum of 293 mol / l. The volume of the solution is trilo-20-photometric. The specified concentration B, which went to the titration, got- ". Shown in the 2nd column

are equal. 17.5 ml. Substituting in the form of the table. Cellulose solvent with

values of 0.05 mol / l; The Vp concentration of the iron – terrate complex is 3 ml and V is 17.5 ml.

the concentration of the 1ezotartrate complex is not possible, as indicated by Compentras C, 0.292 mol / lci is close to the pattern. On the other hand, Example 3. For quantitative Р ° ™ Cellulose solvent with a concentration of the iron – tartrate com-centration of the iron – tartar complex of less than 1 mol / l in practice is not plex in the solvent of cellulose.

titration is likewise used, since the solubility

1. The difference is that the cellulose in such a solvent is sharply

The root sample in an amount of 2 ml is concentrated. Therefore, in the examples

Solvents of the cel0, 491 mol / L solvents are given by the iron – tar complex. The volume of the trilo-solution solution is the concentration of the iron of mercury on B, followed by titration, to obtain a range of 0.1–. are equal to 19.7 ml., Substituting in the form-, l. value of С, - 0.05 mol / l: „

 2 ml V 9.7 ml, the volumes are given in a table.

the concentration of the iron-tartar complex “analysis of the samples, dissolve 0 g - p /, Q9 .. g, / gt40La cellulose, the amount of went to

CS 1 / vJj4, 7i. mol / jt 9

- Example 4. For quantitative titration of the Trilon B solution of the concentration determination of the iron – tartrate coyrometallic acid and the calculated number in the cellulose solvent, pro-. the iron – tartar complex leads titration analogously to the example. on the proposed and on the known. The difference is that they take - b. A sample in the amount of 1.5 ml per concentration — as can be seen from the examples given by the iron – tartrate complex of the table, determination of the concentration of 0.693 mol / l. The volume of the solution of the trilo-iron – tartar complex according to pre B, which was titrated, allows the method to be carried out to be equal to 20.7 ml. Substituting into the form is the definition without heating and without the value of Art. 0.05 mol / l; Vp of the complementary reagent - glycocol, 1.5 ml and 20.7 ml, is obtained with the same accuracy of the method, which is the simplification of the iron – tartrate complex, the Plexus complex, 0.690 mol / l.

C C

Claims (1)

PRI me R 5. For a quantitative formula of the invention for the determination of an iron – tartrate compound plex in cellulose solvent pro- Method of quantitative determination water titration is analogous to the example. iron-tartrate complex in rast5. 14568816 a cellulose donor by treating an acid, characterized by a mineral acid sample being analyzed, in order to simplify the process, up to a pH of 1-3, the introduction of the indicator and the titration with disodium salt solution 4,5-dioxybenzene-1,3ethylenediamine-N, N, N, N tetraacetic disulfonic acid is used as an indicator. acid, characterized in that, in order to simplify the process, 4,5-Dioxybenzene-1,3 di-sodium salt is used as an indicator. 0.097 0.293 0,491 0.693 0.995 g 10,019.4 3,017,5 2,019,7 1,520,7 1,019,8 0.097 0.294 0.492 0.690 0.991