solid phase extraction of some lanthanide ions by functionalized sba-15 fromenvironmental samples

in this research, nanoporous silica (sba-15) was physically functionalized using2-(2-nitrobenzylideneamino) guanidine compound. this functionalized sba-15 was utilized as a new sorbentfor separation and preconcentration of some lanthanide ions. inductively coupled plasma optical emissionspectrometry (icp-oes) was used as a detection technique. the preconcentration factor of the method is 100and detection limit of this technique is obtained 2.9 ng/ml for dy3+, 1.6 ng/ml for eu3+, 8.4 ng/ml for nd3+,3.8 ng/ml for sm3+ and 2.5 ng/ml for yb3+ ions. the time and optimum amount of the sorbent, ph effect,presence of other ions on extraction condition were also tested. the maximum capacity of 5 mg functionalizedsba-15 was found to be about 155.2 μg for sm3+, 131.2 μg for yb3+, 128.1 μg for nd3+, 143.3 μg for eu3+,140.6 μg for dy3+ ions. the method was successfully applied for preconcentration and determination of theselanthanides in some natural water samples.