Application of modified sawdust for solid phase extraction, preconcentration and determination of trace lead in water samples

A new sorbent was prepared for separation and preconcentration of Pb (II) by using the flame atomic absorption spectrometry. The normative studies on extraction, separation and preconcetration of Pb (II) were represented in this work. This novel method was based on new sorbent by adding diethylenetriamine to sawdust, increasing the incidence exterior. The effect of different parameters including, pH, ligand concentration and sample volume, type and volume of eluent and ligand effect were studied. The optimum pH and preconcentration factor and limit of detection for Pb (II) were 4, 100, and 0.48 μg/L, respectively. In addition, the calibration curve was linear in the range of 0.05-100 mg.mL^-1 with R²=0.995. The vertical and horizontal confines of calibration diagrams in 500 mL solution were calculated about 0-0.5 mg L^-1 and 0-0.6. The results of applying the present method to determinate the separated lead ions in water samples were prosperous and harmonious. Precision of the method was investigated by comparing them with the observations from previous similar researches.