Bv. Lvov et al., PRECISION AND DETECTION LIMITS IN ZEEMAN GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY, Spectrochimica acta, Part B: Atomic spectroscopy, 49(12-14), 1994, pp. 1609-1627
This is the first theoretical study of photometric errors in Zeeman gr
aphite furnace atomic absorption spectrometry with evaluation of their
effect on the precision in the traditional method of peak area determ
ination and the pulse restoration method proposed earlier for lineariz
ation and expansion of calibration curves. Besides the fraction of non
-absorbed radiation, alpha, and Zeeman sensitivity ratio, R, the theor
etical calculations make use of three more parameters, namely the ''en
ergy'' value, E, the baseline offset compensation time, t(boc), and th
e integration time, t(int). The theoretical calculations are supported
by experimental data on detection limits for a number of elements and
on the RSD obtained in Ag and Cd determinations. A comparison of the
precision in the case of pulses with dips has shown the pulse restorat
ion method to be superior over the traditional technique. The theoreti
cal results can be used to improve the measurement precision and the d
etection limits by proper modification of the spectrophotometer and op
timization of experimental conditions.