| 摘要 |
<p>An analytical furnace (10) includes a pair of generally vertically extending coaxially mounted spaced furnace tubes (50,40) mounted to a support (20). The inner tube (50) is made of vitreous carbon material which does not react with the specimen during pyrolysis to produce interfering by-products. An analytical sample crucible (110) is supported above the support (20) by a carbonaceous material which in the preferred embodiment comprises a combination of a carbon-felt packing material (130) resting on the support (20) and granular carbon black (120) on which the crucible is placed. The material is selected to position the crucible in the hot zone of the furnace which includes a heater (18) for heating an analytical sample for pyrolysis. The analytical furnace further includes a lance tube (100) extending over and in coaxial alignment with the inner and outer furnace tubes (50,40) for directing a sample and a carrier gas into the open mouth of the cup-shaped crucible (110). <IMAGE></p> |
