Development of Facile and Rapid Method for Determination of Ultra trace Amount of Heavy Metal Ions in Soil Aiming at Secure Society

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This study was aimed at developing a facile and rapid method to determine exchangeable heavy metal ions such as Cd and Pb in soil. In the first step, thiacalix[4] arene was utilized as the extractant to accelerate the leaching processes from 6 h to only 10 min, owing to the complexation ability toward Cd and Pb. This step was followed by quantitative ligand replacement with the thiosemicarbazone ligand, the resulting complex of which was then subjected to kinetic differentiation mode HPLC to enable highly selective and sensitive detection of exchangeable Cd and Pb at the ppb levels without interference from soil matrices.