抄録
A method for solid phase extraction of trace metals such as Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn using nanometer sized alumina coated with chromotropic acid prior to determination by inductively coupled plasma atomic emission spectrometry (ICP-AES) has been developed. Various parameters influencing on the separation and preconcentration of trace metals, such as pH, flow rate, sample voulme and concentration of eluent were studied. The maximun adsorption capacity of the solid phase adsorption material was 10.3, 11.3, 14.5, 16.4, 15.1, 11.7, 15.4 and 16.8 mg/g for Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn, respectively. The detection limits for Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn were found to be 0.14, 0.62, 0.22, 0.54, 0.27, 0.28, 0.53 and 0.38 ng/ml, respectively. The preconcentration factor was obtained in the range of 50–100 for all studied metal ions. Coexisting ions over high concentration range did not show any significant effect on the determination of aforesaid metal ions. The accuracy of the proposed method was tested by standard reference materials (NIST 1643e: water, NIST 1573a: tomato leaves and NIST 1568a: rice flour), and the results agreed well with the certified values.
