Determination of trace elements in natural water using X-ray fluorescence spectrometry after preconcentration with powdered silica gel

摘要

A simple and cheap method is described for simultaneous determination of V, Cr, Mn, Fe, Co, Ni, Cu and Zn contents inwater by means of wavelength-dispersive X-ray fluorescence (WDXRF) spectrometry after preconcentration. The method ofpreconcentration is based on sorbing analytes onto silica gel powder. 1-(2-pyridylazo)-2-naphthol (PAN) is used as a chelatingagent. The effect of some parameters such as pH, temperature, stirring time, amount of ligand, breakthrough volume and thelimit of detection has been studied. The detection limits 0.120, 9.75 x 10-4, 0.075, 0.070, 0.061, 0.089, 0.029 and 0.044 mg!'were achieved for V, Cr, Mn, Fe, Co, Ni, Cu and Zn, respectively.