Iridium and rhodium as permanent chemical modifiers for the determination of Ag, As, Bi, Cd, and Sb by electrothermal atomic absorption spectrometry

摘要: Abstract Performance of graphite platforms coated with Ir, Rh, and a mixture both, as permanent modifiers for Ag, As, Bi, Cd, Sb, was evaluated. The coating process is very simple: solution containing or both pipetted on the platform inserted in tube, this submitted to temperature program. High pyrolysis temperatures are allowed, especially As 1400°C, Ir + Rh-coated platform. sensitivity remains about same all analytes different coatings, except Ir-coated platform, which remarkable gain obtained comparison other coatings. lifetimes treated tubes were range 50 more than 1000 cycles, being long Sb Ag 600 respectively. Rh could not be used Bi Cd. Analysis certified reference water acid oyster tissue digests showed absence interference good precision. Advantages coatings possibility low blanks byin situcleaning modifier shorter analysis time.