Abstract
The silica gel-immobilized imminoacetate (SIA) was prepared by treating silica gel with N-(2-aminoethyl)-γ-aminopropyltrimethoxysilane, and then subsequently with monochloroacetate. The resulting SIA was found effective for the selective preconcentration of metal ions, especially for that of Cu(II). The sample solution was passed through the column packed with SIA at a flow rate of 10 ml min-1. Cu(II) was eluted with 3 M hydrochloric acid at a flow rate of 4.0 ml min-1, then being amperometrically detected by the glassy carbon flow-through electrode. Various foreign substances as high as 0.05 M, did not interfer the recovery of trace Cu(II). The proposed method was applied to the determination of Cu(II) at ng ml-1 concentration lebel in the synthetic sea water. The lower detection limit was 0.1 ng ml-1 for a 20 ml sample, when the signal to noise ratio was 3. The determination of Cu(II) in water could be performed at a 10 samples h-1 rate with satisfactory precision.
