Electrothermal Atomic Absorption Determination of Trace Lead and Cadmium in Urine after Preconcentration and Separation from the Matrix on a DETATA Adsorbent

Abstract

ous solutions at room temperature and low concentrations of modifiers. A linear correlation between the Kubelka–Munk function of colored chemisorption products and the concentration of reagents allows one to combine the chemisorption preconcentration of compounds on polyurethane foams with their determination by diffuse reflectance spectroscopy. It was shown that the high reactivity of terminal groups could be used for the chemical modification of polyurethane foams by at least two methods. One method involves the direct chemical reaction between suitable modifiers and the surface amino groups of polyurethane foams. This approach forms a basis for the determination of free active chlorine and nitrite and nitrate ions. The other method involves a series of successive chemical transformations after the activation of these materials by the introduction of an amino group. This version was used for the development of sorption–photometric procedures for determining phenols, naphthols, and aromatic amines.