Abstract
This paper carries out a study of an environmentally friendly natural material for creating a carbon-paste electrode and its application for Fe(II) determination. The electrode-active material (iron-containing carbonized keratin waste) was characterized by scanning electron microscopy (SEM), thermal analysis (DTA, TGA), and FT-IR spectroscopy. The advantages of an electrode modified with composite material are a high selectivity coefficient, a sufficiently wide range of linearity of the electrode pH function for iron (II) ions due to the presence of iron (III) oxide in the carbonation product. The analytical characteristics of the electrode containing Fe (III) were determined in the direct potentiometry mode with a relative error of about 8% and the potentiometric titration (chelatometry) mode with a change in the electrode potential of 4.4 mV and a relative error of 0.2%.
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