Spektrochemische schnellbestimmung einiger spurenelemente in der kohlenasche mit alumininmelektroden und verwendung des sichtbaren spektralgebietes

Using an a.c. arc and visible spectral lines a spectrographic method for the rapid determination of traces of Co, Cr, Ga.In, Pb and V in synthetic coal ashes has been worked out, in which the samples are burned in Al electrodes thus avoiding perturbation by cyanogen bands. With the help of intensity-time studies an exposure time of 10 sec was found giving optimum power of detection as well as optimum reproducibility. By a suitable choice of experimental conditions the background density was adjusted to a value which permitted making accurate background corrections and using the background as reference radiation at the same time. Variation of the method included the application of intermediate diaphragms and the use of Fe-lines as well as of the background as reference signals with and without background correction. The standard deviations as well as the tested concentration ranges are reported.