The adsorptive potential of immobilized nanometer ... for the preconcentration of trace.... was assessed in this work. The metal ions studied can be quantitative retained at a pH range of ........... was sufficient for complete. The adsorption capacity of immobilized nanometer....., respetively. A new method using a microcolumn packed with imobilized nanometer.... as sorbent has been developed for the preconcentration of trace amount..... prior to their determination by.... The method has been successfully applied for the determination of trace elements in some environmental samples with satisfactory result.