Tubular furnace for the electrothermal atomization of samples in atomic absorption spectroscopy

摘要

A tubular furnace for the electrothermal atomisation of samples in atomic absorption spectroscopy comprises a tubular furnace body (36), on opposite sides of which there are longitudinally extending contact ribs (38, 40) to which cylindrical contacts (18, 20) are connected. To reduce the cross section for the supply of current along the central region of the furnace body (36), in one embodiment drilled holes are provided in the contact ribs (38, 40) parallel to the furnace body (36). The drilled holes are cut by transverse drilled holes (56, 58, 60 or 62, 64, 66) and they are also connected to protective gas channels (68, 70). The drilled holes are therefore used both to reduce the cross section and also to distribute the protective gas. In another embodiment, slots are provided in the flat surfaces of the contact ribs instead of the drilled holes. This achieves a uniform temperature distribution over the furnace body (36). The furnace body (36) contains a cylindrical shell-shaped inner body (76) having an internal half thread (78). …IMAGE…