A NEW METHOD FOR STANDARDLESS ANALYSIS IN ETA-AAS APPLIED TO THE DETERMINATION OF LEAD ASSOCIATED WITH AIR AEROSOL

摘要

The analysis of Pb associated with air aerosols by its accumulation through electrostatic precipitation directly in a graphite tube, which is subsequently, used as an atomizer in electro thermal atomization-atomic absorption spectroscopy (ETA-AAS), has already been tested and found very convenient for its simplicity and speed. However, its use as a practical and useful method of analysis was hampered by the necessity of a laborious and difficult calibration with high risks of systematic errors. These difficulties can be bypassed by resorting to an absolute or standardless method of analysis. Standardless methods of analysis have been proposed for ETA-AAS measurements and recently applied to Cd and Hg. With the use of a new and more powerful power supply this method has been extended to Pb so that a very easy, fast, and almost on Line way of measuring the level of Pb in air aerosols is possible. The system presented in this paper is manually operated but its automation, in order to obtain an automatic control station, is only a matter of convenience. (C) 1996 Academic Press, Inc. [References: 27]