Improvements in repetitive scanning techniques for reducing spectral interferences in flame emission spectrometry

This paper describes several improvements in the use of the repetitive optical scanning (wavelength modulation) technique applied to the correction for spectral interferences due to line, band, and continuum radiation in flame emission spectrometry (FES). A simple and easily constructed mechanical device for performing the repetitive scan is described, and the procedures for optimizing experimental conditions are discussed. A new technique for the correction for spectral line interferences is introduced. Repetitive scanning FES is used for the analysis of several trace elements in NBS SRM-1633 (fly ash), and the precision and accuracy of results are compared to analysis by normal flame emission techniques.