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- W2000751657 abstract "Abstract The principal objectives were to measure the in situ absolute steady-state levels of C 2 and CN in a graphite furnace under varying working conditions (temperatures, gas compositions, samples), and to describe the experimental data with a thennodynamic equilibrium model. In an empty atomiser at 3000 K, the partial pressure of C 2 was found to be at heterogeneous equilibrium. For CN, the partial pressure increased with temperature from 5 to 25% of the model value at 2300 and 2600 K, respectively. The CN level was shown, experimentally and by modelling, to be sensitive to the presence of oxygen. The partial pressure of CN exhibited a gradient between the tube wall and the centre of the tube. It is shown that the CN level inside the graphite tube can be used as an indicator for air ingress. The side-heated atomiser was compared in this respect to a Massmann-type furnace. The matrix modifiers Mg (NO 3 ) 2 and (NH 4 ) 2 HPO 4 are shown to reduce the partial pressure of CN under the atomisation step, which may be of importance for atomisation efficiencies of analytes susceptible to cyanide formation." @default.
- W2000751657 created "2016-06-24" @default.
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- W2000751657 date "1991-01-01" @default.
- W2000751657 modified "2023-09-23" @default.
- W2000751657 title "Quantitative in situ spectroscopic measurements ana thermodynamic equilibria modelling of CN and C2 in a graphite furnace" @default.
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- W2000751657 doi "https://doi.org/10.1016/0584-8547(91)80062-8" @default.
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