Development and properties of iron-containing chemical modifier based on activated carbon for electrothermal atomic absorption determination of volatile elements

Resumo

The energies of chemisorption of As, Se, Pb, and Cd atoms by the metal surface of iron are calculated by the quantum chemistry method. The possibility of analytical application of an iron-containing chemical modifier (CM) on the basis of activated carbon for ETAAS determination of volatile elements is suggested. By the methods of thermodynamic modeling, thermal analysis, and ETAAS, the preparation procedure of iron-containing CM is justified on the basis of activated carbon, which ensures the formation of the metallic phase Fe⁰ and the course of low-temperature thermal stabilization of analytes. Using the developed chemical modifier, the contents of As, Cd, and Pb are determined in the suspensions of the standard sample of seaweeds. The results are in satisfactory agreement with the certified values.