Effect of matrix components on chromium atomization processes in graphite furnace atomic absorption spectrometry |
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| Affiliation: | 1. Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104 USA;2. CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201210, PR China;3. Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA;1. Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;2. Institute for Solid State Physics, Kashiwa, Chiba 277-8581, Japan;1. Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia;2. Novosibirsk State University, Pirogova St., 2, Novosibirsk, 630090, Russia;3. Novosibirsk State Technical University, Karl Marx Pr., 20, Novosibirsk, 630073, Russia |
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| Abstract: | The effect of various organic and inorganic matrix components on chromium atomization in graphite furnace atomic absorption spectrometry is studied. The results are explained on the basis of chromium's atomization mechanisms. The two predominant mechanisms are the thermal dissociation of the oxide and of the carbide. Losses through molecular volatilization reduce the sensitivity when chromium chelate complexes are atomized. In this case, the atomization mechanism consists of the thermal dissociation of the chelate. The formation of chromium carbide from the carbon residue produced by decomposition of the organic solvents leads to a loss of sensitivity. |
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