... , Se, Sb, Bi, Pb, Sn, Te, Ge, In, Model GD320N Atomic Absorption SpectrophotometerCharacteristics A Build-in computer data processing ... current Deuterium Lamp power supply: with fixed currentOptical system: Double beam total refection system, C-T type monochromator Flashing ... 0.7nm, 1.4nm, 2.4nm, 5.0nm Resolution: <40% Base line stability: ±0.004Abs/30min Characteristic concentration of copper ...