High-Resolution Continuum Source AAS

Only 1-3 pixels are used for registering the analyte absorption, so all the remaining pixels are available for correction purposes. Both fluctuations in lamp emission and transmission of the atomizer are accounted for, making the system a simultaneous double-beam system of high precision with simultaneous background correction. [Pg.458]

Since the intensity of the source does not affect sensitivity, but does influence the noise, the high-intensity source increases the DLs of this system by a factor of 2-5 over conventional AAS. The linear dynamic range of the system is 5-6 orders of magnitude, much broader than conventional AAS and similar to inductively coupled plasma-optical emission (ICP-OES) (discussed in Chapter 7). [Pg.458]

The high-intensity continuum source offers a number of advantages over narrow line sources. Secondary lines (nomesonance lines) can be used in order to reduce sensitivity, thereby avoiding dilntions. All spectral lines are available, including lines for which no HCL or EDL sources are available, such as fluorine and chlorine. In addition, molecular absorptions, such as those of diatomic fragments like CS or PO, can be used to measure sulfur and phosphorus (Huang et al.) [Pg.458]

The CCD detector permits not only simultaneous background correction but complete correction of spectral interferences such as structured background from molecular species such as OH and NO. The resolution permits collection of the spectra from these species and removal of them from the absorbance of the sample. Direct-line overlap can also be corrected, if the matrix has an additional absorption line within the registered spectral range of the detector. Direct-line overlap is rare and usually is due to line-rich matrices such as Fe, so the system can reliably correct for the direct overlap of Fe on Zn, for example. [Pg.458]

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