Effects of slow instrumental responses on the accuracy of furnace atomic absorption spectrometric determinations

Minimization of background correction errors using nonlinear estimates of the changing background in carbon furnace atomic absorption spectrometry

“…In the intensity domain, the generalized eq 2-4 can be used by substituting Ix -/4, Is, and /Ref for A, -A4, As, and ARef, respectively. Thus, intensity-dependent expressions for eq 5-7 are Handling the data in the intensity domain can lead to nonlinearities not found in the absorbance domain (4). However, the general shapes and magnitudes of the plots in Figure 2 are essentially unchanged when the data are handled in the intensity domain.…”

“…Ideally, intensity values should be converted to absorbances before further processing. Summing data in the intensity domain before computing absorbances can lead to errors due to the nonlinearity of the intensity domain (4). The SIMAAC data acquisition program processes the data in the intensity domain to facilitate and expedite the calculations.…”

Characterization of two modified carbon rod atomizers for atomic absorption spectrometry

“…The modifications made to the Varían Model AA6 spectrometer and to the Model 63 CRA furnace power supply have been dis-0003-2700/83/0355-0099$01.50/0 cussed in previous papers (10,11). The important differences between them and the standard equipment include considerably "faster" analog electronics in the signal processing circuitry and the addition of an optional temperature feedback controller to the furnace power supply.…”

“…The important differences between them and the standard equipment include considerably "faster" analog electronics in the signal processing circuitry and the addition of an optional temperature feedback controller to the furnace power supply. A Thermodot optical pyrometer interfaced with the same Hewlett-Packard computer system used to collect the atomic absorption transient signal data permitted simultaneous recording of the temperatures of a selected point on the atomizer's surface (10).…”

Background correction errors originating from nonsimultaneous sampling for graphite furnace atomic absorption spectrometry

“…Lundberg and Freeh (10) have clearly shown that excessive filtering in early instruments produced misleading results when absorbance-time information was to be used. In addition, only filtering of the absorbance data is discussed here, as filtering of the raw intensity data can lead to inaccuracies (11). Only the impact of filtering on the accuracy of the background corrected absorbances will be evaluated in this study.…”