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In page Atomic absorption spectroscopy:

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Often, single element lamps are used where the cathode consists predominantly of compounds with the target element. These single element lamps provide precision with specific and stable emission lines that are element specific.[1] Multi-element lamps[citation needed] are available with combinations of compounds containing the target elements as the cathode but are less accurate. Multi-element lamps have slightly less sensitivity than single element lamps, so the combinations must be selected carefully to avoid spectral interference. Atomic absorption spectrometers can feature as few as 1-2 hollow cathode lamp positions or, in automated multi-element spectrometers, 8-12 lamp positions may be available. Usually, separate single element lamps are used for different elements.[1]