The removal of Sb(III) from waste water is achieved in batch system by using grey and red Erzurum (Oltu) clay which are cheap and natural adsorbents. Adsorption experiments were studied. For this purpose, various important parameters such as contact time, pH, and temperature were examined on the adsorption of Sb(III) ions onto grey and red Erzurum (Oltu) clay. Decreasing amount of Sb(III) ions in the solutions by adsorption was determined with differential pulse anodic stripping voltammetry (DPASV) method. Langmuir and Freundlich isotherms for the adsorption processes were drawn. The adsorption was demonstrated in similarity with Langmuir model. The maximum adsorption capacity of red Erzurum clay for Sb(III) was found to be 9.15？mg/g. Also, surface of the adsorbent was characterized by using FTIR spectroscopy. Red Erzurum clay was applied on real sample (Gediz River), and 72.6% adsorption was obtained. 1. Introduction Heavy metal ions such as Sb(III) are toxic and carcinogenic at relatively low concentrations. Antimony has been extensively used in lead alloys, battery grids, bearing metal, cable sheathing, plumber’s solder, pewter, ammunition, sheet, and pipe. Among the most important uses of antimony in nonmetal products are textiles, paints and lacquers, rubber compounds, ceramic enamels, glass and pottery abrasives phosphorus (a beryllium replacement), and certain types of matches (SbCl3) [1, 2]. US EPA and EU have established 6 and 10？μg？L？1, respectively, of maximum permissible Sb concentrations in drinking water [3, 4]. In natural water, Sb mainly exists in the inorganic forms of Sb(III) and Sb(V) [5]. Antimony(III) is reported to be 10 times more toxic than Sb(V) [6–9]. When redox speciation determinations are performed, most studies report the dominance of Sb(V) under oxic conditions. However, the presence of significant proportions of Sb(III) is sometimes detected [10]. The analytical techniques more commonly used for the characterisation of aqueous antimony species are hydride generation methods coupled with AAS, AES, and MS detection systems. A variety of electrochemical methods have also been used for determination of total antimony in natural water samples. Determination of total antimony by differential pulse anodic stripping voltammetry (DPCSV) has been described by a few authors [11–14]. Niedzielski and Siepak presents a comparative description of different methods of determination of arsenic, antimony, and selenium: spectrophotometric, electroanalytical (voltamperometry), activation analysis, atomic fluorescence, and the methods of
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