STUDY OF CHROMIUM(VI) INTERACTION WITH 2-(3-(AZEPAN-1-YL)-2-HYDROXYPROPYLTHIO)ACETIC ACID

Abstract

The interaction of chromium(VI) with 2-(3-(azepan-1-yl)-2-hydroxypropilthio) acetic acid has been studied by means of potentiometric, amperometric and spectrophotometric titration methods. The titration is possible to carry out in the acidity range $3.0-7.0~mol / L$ by sulfuric acid. Molar ratio of the reacting agents is [Cr(VI)] : [Reagent] $= 2 : 3$. Conformity to the Beer’s law is preserved when $8.3\cdot10^6-2.0\cdot10^3~mol / L$ at $E=+0.2~V$ and when $2.0\cdot10^5-2.0\cdot10^3~mol / L$ at $E =+1.2~V$ chromium(VI) solutions were titrated. The technique elaborated has been approved during the analysis of standard chromium-containing ore with standard relative deviation 0.61% . Possible scheme describing the interaction of chromium(VI) with the reagent has been suggested.