Electrothermal atomization of beryllium from graphite and tungsten surfaces was compared with and without the use of various chemical modifiers. Tungsten proved to be the best substrate, giving the more sensitive integrated atomic absorption signals of beryllium. Tungsten platform atomization with zirconium as a chemical modifier was used for the determination of beryllium in several NIST SRM certified reference samples, with good agreement obtained between the results found and the certified values. The precision of the measurements (at 10 mu g L-1), the limit of detection (3 sigma), and the characteristic mass of beryllium were 2.50%, 0.009 mu g L-1 and 0.42 pg, respectively.
- electrothermal atomic absorption
- chemical modifiers
- zirconium modifier
- tungsten platform atomization
- graphite platform atomization