THE UTILIZATION OF CHITOSAN THIOUREA FOR Cd(II) PRECONCENTRATION BY THE SOLID PHASE EXTRACTION (SPE) TECHNIQUE

Chitosan thiourea has been synthesized from crab shell starting material and the product of synthesis was then utilizing for Cd(II) metal preconcentration in the sea water medium. Synthesis process is done through the interaction between chitosan solution with thiourea solution, and was then characterized by FTIR spectrophotometer and XRD diffractometer. The preconcentration of Cd(II) metal conducted by using adsorption-desorption process with the flow injection system of Cd(II) metal solution in the SPE technique. The preconcentration process of Cd(II) metal also involved the influence of acidity, flow rates, and salt concentration to obtain an optimum preconcentration level.- As a result, this study revealed that the successfully of chitosan thiourea synthesis process well marked by interaction between chitosan active sites (-NH2) and thiourea compound, which showed by the changes of chitosan FTIR spectra at the 1577.7 cm&mac