Solid phase extraction of arsenic using an iron(III)-supported chelate resin immobilizing carboxymethylated pentaethylenehexamine

A fundamental investigation of the solid phase extraction of arsenic has been conducted using an iron(III)-supported chelate resin immobilizing carboxymethylated pentaethylenehexamine. The amount of arsenic(V) adsorbed on the resin reached the maximum value at pH 4 - 6. Arsenic(III) was scarcely adsorbed; however, it could be collected on the resin after the oxidation of arsenic(III) to arsenic(V) using a sodium hypochlorite solution. The adsorbed arsenic(V) could be eluted using a sodium hydroxide solution, and was then determined by inductively coupled plasma atomic emission spectrometry. The amount of arsenic(III) could be calculated by subtracting the amount of arsenic(V) from that of both arsenic(III) and arsenic(V), which was obtained using a sodium hypochlorite solution. The proposed method was applicable to the analysis of a certified reference material (Ground Water, ES-H-1).