chapter10atomicemissionspectrometry

chapter10atomicemissionspectrometry内容摘要：

ing long enough (a few seconds) at each to obtain a satisfactory signaltonoise ratio.  multichannel instruments (多通道仪器 ) are designed to measure the intensities of emission lines for a large number of elements (sometimes as many as 50 or 60) simultaneously. 14 10A4 application of plasma sources Plasma sources are rich in characteristic emission lines, which makes them useful for both qualitative and quantitative elemental analysis. 15 Calibration curves Calibration curves for plasma emission spectrometry most often consist of a plot of the output current 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 ele。