Model calculation of the characteristic mass for convective and diffusive vapor transport in graphite furnace atomic absorption spectrometry

摘要: Abstract A combination of former convective–diffusive vapor-transport models is described to extend the calculation scheme for sensitivity (characteristic mass — m 0 ) in graphite furnace atomic absorption spectrometry (GFAAS). This approach encompasses influence forced convection internal gas (mini-flow) combined with concentration diffusion analyte atoms on residence time a spatially isothermal furnace, i.e., standard design transversely heated atomizer (THGA). couple relationships diffusional and convectional times were studied compared, including factors accounting effects sample/platform dimension dosing hole. These model approaches subsequently applied particular cases Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Mo, Ni, Pb, Sb, Se, Sn, V Zn analytes. For verification accuracy calculations, experimental values determined application THGA operating either under stopped, or mini-flow (50 cm 3  min − 1 sheath during atomization. The theoretical ratios (mini-flow)-to- (stop-flow) closely similar each study analyte. Likewise, calculated data gave fairly good agreement corresponding stopped conditions, it ranged between 0.62 1.8 an average 1.05 ± 0.27. indicates usability current calculations checking operation given GFAAS instrument methodology.