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In page Atomic absorption spectroscopy:

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In LS AAS background absorption can only be corrected using instrumental techniques, and all of them are based on two sequential measurements:[1] firstly, total absorption (atomic plus background), secondly, background absorption only. The difference of the two measurements gives the net atomic absorption. Because of this, and because of the use of additional devices in the spectrometer, the signal-to-noise ratio of background-corrected signals is always significantly inferior compared to uncorrected signals. It should also be pointed out that in LS AAS there is no way to correct for (the rare case of) a direct overlap of two atomic lines. In essence, there are three techniques used for background correction in LS AAS.[citation needed]