susceptithroughput
and spectral resolution of e´chelle spectrometers, bility to broadband background interferences. In addition, the
the multi-wavelength detection capability, low read noise and intensity of most continuum sources decreases dramatically
high quantum efficiency of charge coupled detectors (CCDs) below 280 nm. Consequently, the use of a continuum source
and the high speed data acquisition capabilities of modern for AAS requires the redesign of the whole instrument.
computers, CS-AAS has surpassed the analytical capabilities As shown in Table 1, a variety of instrumental designs have
of LS-AAS. These advantages will be explained in detail in been explored for CS-AAS. The three main challenges were
this review. Although it takes time for the implementation of to obtain sensitivities, detection limits and calibration ranges
new concepts, especially when it requires a considerable capital comparable to LS-AAS. Sensitivity was initially enhanced by
investment, CS-AAS appears ripe for development. It seems the use of multipass absorption cells.3,4 It soon became obvilikely
that if AAS was being developed today for the first ous, however, that the best approach to recovering the lost
time, it would be with a continuum source. sensitivity was the use of a high resolution spectrometer
AAS, as first described by Walsh1 and Alkemade and (interferometers and e´chelles)7–14 to provide the narrow analyt-
Milatz,2 derived its success from the use of hollow cathode ical bandwidth previously supplied by the HCL. Obtaining
susceptithroughput
and spectral resolution of e´chelle spectrometers, bility to broadband background interferences. In addition, the
the multi-wavelength detection capability, low read noise and intensity of most continuum sources decreases dramatically
high quantum efficiency of charge coupled detectors (CCDs) below 280 nm. Consequently, the use of a continuum source
and the high speed data acquisition capabilities of modern for AAS requires the redesign of the whole instrument.
computers, CS-AAS has surpassed the analytical capabilities As shown in Table 1, a variety of instrumental designs have
of LS-AAS. These advantages will be explained in detail in been explored for CS-AAS. The three main challenges were
this review. Although it takes time for the implementation of to obtain sensitivities, detection limits and calibration ranges
new concepts, especially when it requires a considerable capital comparable to LS-AAS. Sensitivity was initially enhanced by
investment, CS-AAS appears ripe for development. It seems the use of multipass absorption cells.3,4 It soon became obvilikely
that if AAS was being developed today for the first ous, however, that the best approach to recovering the lost
time, it would be with a continuum source. sensitivity was the use of a high resolution spectrometer
AAS, as first described by Walsh1 and Alkemade and (interferometers and e´chelles)7–14 to provide the narrow analyt-
Milatz,2 derived its success from the use of hollow cathode ical bandwidth previously supplied by the HCL. Obtaining
การแปล กรุณารอสักครู่..
