| Abstract: | This paper describes an improvement in detection capability of microwave plasma torch atomic emission spectrometry by using a flow-injection on-line column preconcentration system. The analytical performances of Cd, Cu, Mn and Zn were studied. The analytes were preconcentrated with a thiol resin. The preconcentration period, the pH of the sample solution and the HCl concentration in the eluant were examined in detail. Operating conditions were optimized as follows: sample uptake, 1.2 ml min(-1); preconcentration period, l min; pH of sample solution, 9; HCl concentration in the eluant, 1 mol 1(-1). The experimental results show that flow-injection on-line column preconcentration can not only eliminate the effect of some concomitant elements, such as Li, Na and K, on the determination of analyte, but also enhance the sensitivity. |
