[Study on stray light in self-reversal background correction for atomic absorption spectrometry--the properties of...

In self-reversal background correction the particularity of stray light that is not absorbed by the sample matrix is different from that in deuterium lamp and Zeeman background correction. The stray light is evaluated using the cut-off solution method and its effects were studied by means of simulation background absorption using potassium dichromate solution molecular absorption. Experiments confirmed that the stray light due to light source for the sample beam (Conventional pulse, low Current) and reference beam (narrow pulse, high current) is obviously different, with the former being higher than the latter. Therefore, the difference is an important source in self-reversal background correction errors and the errors can not be ignored in high background correction. The present paper also showed the relationships among stray light and lamp current, light energy, and spectral bandwidth. The results show that the ratio of stray light is much related to the lamp current, and the larger the lamp current, the smaller the ratio of stray light. The ratio of stray light that changes with lamp current is not directly related to the energy of analytical line. Stray light ratio decreases with the decrease in spectral bandwidth and its character is similar to continuous spectrum.