Abstract
Electrothermal atomic absorption spectrometry (ETA-AAS) of aluminum with a tungsten tube atomizer was investigated. By the addition of hydrogen to the argon purge, a sensitive ETA-AAS method was developed. The optimum gas flow-rates were argon 300 ml min −1 and hydrogen 200 ml min −1. The absolute characteristic mass (the mass of element giving 0.0044 absorbance) of aluminium by the atomizer was 0.98 pg and the detection limit was 52 pg ml −1. These values were more than ten times better than those obtained using a graphite atomizer, inductively coupled plasma (ICP), flame AAS, neutron activation analysis, x-ray fluorescence spectrometry and ICP mass spectrometry. The interferences caused by large amounts of interferents were evaluated. For severe interferences, the standard additions method was applied to the determination. The analytical results were in good agreement with the certified values.
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