Model GD320N Atomic Absorption Spectrophotometer Making the characteristic concentration of As, Se, Sb, Bi, Pb, Sn, Te, ... light beam passes through the flame to ensure a high precision analytical test and low characteristic concentration Optical path of ... nitrous oxide-acetylene flame analysis.Hydride generator (Totally automatic): Making the characteristic concentration of As, Se, Sb, Bi, Pb, Sn, Te ...