For the determination of arsenic with the GF, standard
pyrolytically coated graphite tubes and platforms
were used. For the decomposition of arsenic hydride,
the equipment used comprised a T-shaped quartz tube
as the atomizer and a C2Hz/air flame burner. A hollow
cathode lamp, product of the Varian-Techtrone company,
was used as the radiation source. High purity
argon, containing no more than 2 × 10-4% 02 and 1 ×
10-3% N2, was used to protect the GF during the
atomization cycle. The same gas was used as carrier
gas in the HG method for transfer of the arsenic
hydride produced into the quartz atomizer.
For the determination of arsenic with the GF, standard
pyrolytically coated graphite tubes and platforms
were used. For the decomposition of arsenic hydride,
the equipment used comprised a T-shaped quartz tube
as the atomizer and a C2Hz/air flame burner. A hollow
cathode lamp, product of the Varian-Techtrone company,
was used as the radiation source. High purity
argon, containing no more than 2 × 10-4% 02 and 1 ×
10-3% N2, was used to protect the GF during the
atomization cycle. The same gas was used as carrier
gas in the HG method for transfer of the arsenic
hydride produced into the quartz atomizer.
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