| 摘要 |
<p>The invention relates to a carbon-material, transversely or longitudinally heated atomising furnace (1) for flameless atomic absorption spectrometry and comprising a tube furnace section (17) and a sample carrier (2) in said tube furnace section. The improvement of the invention is that the sample carrier for fixing in the tube furnace has a central peg or foot (4) which is on the lower surface of said sample carrier and is fixed in a recess which corresponds substantially to the pegform, is in the centre of the inner wall of the tube furnace and substantially opposite the sample input opening. The sample carrier and the tube furnace section consist of electrographite. The gas-accessible surface of the sample carrier and the tube furnace section is coated with pyrocarbon. The two aforementioned parts are undetachably connected to each other in a defined manner by said pyrocarbon coating. The sample carrier preferably extends across the largest possible part of the longitudinal extension of the tube furnace. The surface of the sample carrier has a trough-shaped recess (5) which can hold up to a quantity of 50 νl of analyte solution. The weight of the sample carrier is reduced by structural measures. When functioning, the atomising furnace demonstrates a good level of long-term stability with respect to sensitivity and reproducibility, and a larger linear concentration working range in relation to time-integrated extinction.</p> |
