chapter10atomicemissionspectrometry-全文預(yù)覽
【正文】 urrent or voltage of a transducer as a function of analyte concentration. When the range of concentrations is large, loglog (p243) plots are employed instead. 16 10B emission spectroscopy based on arc and spark sources Arc and spark source spectroscopies were the first instrumental methods to bee widely used for analysis. Arc and spark sources still find considerable use in qualitative and semiquantitative analysis but have been largely displaced by plasma methods when quantitative data are required. 17 18 In arc and spark sources, sample excitation occurs in the gap between a pair of electrodes (P246: figure 1016). Passage of electricity from the electrodes through the gap provides the necessary energy to atomize the sample and produce atoms or ions in electronic excited states. 19 10B2 instruments for arc and spark source spectroscopy spectrograph （攝譜儀） detection and recording of dispersed radiation is acplished with a photographic film or plate located at the focal plane or curve of a monochromator. 20 21 10B3 arc source emission spectroscopy ? Arc sources are particularly useful for qualitative and semiquantitative analysis. Several spectra can be obtained on one pla
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