Abstract
The influence of cationic water-soluble polyelectrolyte PSPMG on the interaction of scandium (III) with organic reagent eriochromcyanine is studied. Because the study of the possibility of obtaining new, more effective, modified reagents with a complex of better analytical characteristics is an actual analytical task. The optimal conditions of complex formation were experimentally determined: the pH range (5.5–6.5), the order of the adding of the components (1 – scandium, 2 – ECR, 3 – PSPMG, 4 – buffer solutions), the composition of the Sc-ECR-PSPMG complex (1:4:1) were experimentally determined and the molar absorption coefficient – 1.8·10 5 was calculated. A sensitive spectrophotometric method for scandium determination in solutions at the level of 10 -7 mol/L was developed. The optimal scandium sorption parameters in the form of three-component systems Sc-OR-modifier on solid-state carriers were established, scandium sorption isotherms were constructed, sorption parameters of A gran and K ads were calculated. The test systems for the identification of scandium as ternary compounds in polyurethane foam and cotton were proposed, calibration curves in the concentration range from 1·10 -6 –1·10 -5 mol/L were built and the colorimetric method of identification of scandium in solutions that accelerate analysis was proposed. It is shown that the PSPMG application is a promising direction for improvement of chemical-analytical characteristics of organic reagents (eriochromcyanine and chromazurol S) because its usage increases the sensitivity and selectivity of the spectrophotometric determination of scandium in the form of a complex Sc-OR-PSPMG.
Highlights
Modern analytical chemistry has a diverse arsenal of methods for scandium determination
These requirements are most fully consistent with biphasic water systems based on water-soluble polymers such as polyethylene glycols (PEGs) that are used for separation, concentration and determination of liquid, radioactive elements
Results of triple complex research It is known that the eriochromcyanine R (ECR) and scandium form a complex with a maximum absorption of about 535 nm [1]
Summary
Modern analytical chemistry has a diverse arsenal of methods for scandium determination. Instrumental methods of atomic spectroscopy, such as emission spectrographic analysis [1, 2], flow-injection [3], neutron activation [4], mass spectrometric analysis [5] make it possible to accurately determine even small quantities of scandium in geological and biological environments. By performing physical-chemical research, analysis of various compounds and materials, containing scandium with a certain combination of other elements, spectrophotometric methods are widely used now. By performing physical-chemical research, analysis of various compounds and materials, containing scandium with a certain combination of other elements, spectrophotometric methods are widely used To improve these methods, new organic derivatives of scandium are used as analytical forms, which, together with inorganic anions and complex cations, can significantly increase the selectivity of the determination [6]
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