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- W2022136104 abstract "Morphological studies on graphite surfaces by scanning electron microscopy are presented for tubes made from total pyrolytic graphite (TPG). The inner surface of TPG tubes was found to be fairly rough due to adhering residues of the polycrystalline electrographite substrate on which they were deposited. These residues were vaporized on subsequent dry heating of the tube and recondensed on the tube surface in the form of nodules and flakes. The residues disappeared entirely when the tube was heated with an analyte solution. All experiments were continued for about 550 atomization cycles, and all tubes appeared to be in good condition at that point. The sensitivity for vanadium in dilute nitric acid and for molybdenum in iron, however, had decreased by about 50% during the experiment. The signal for phosphorus in the presence of lanthanum as the modifier disappeared almost entirely and that for copper in perchloric acid was very erratic throughout the experiment. However, it was not always possible to correlate a change in analytical performance with a visible corrosion pattern. The absence of any Socondary carbon coating on the inner surface of the TPG tubes was considered to be the main reason for the inconsistency of analytical signals. Primary faults caused by irregular crystal growth were found to be the most likely locations for corrosive attack. Delamination, exfoliation and pitting were the types of corrosion found in all tubes, the extent, however, was dependent on the matrix used in a particular experiment." @default.
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- W2022136104 date "1989-01-01" @default.
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- W2022136104 title "Scanning electron microscopy studies on surfaces from electrothermal atomic absorption spectrometry-IV. Total pyrolytic graphite tubes" @default.
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