Bv. Lvov et al., EFFECTIVENESS OF LINEARIZATION OF CALIBRATION CURVES IN ZEEMAN GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY, Spectrochimica acta, Part B: Atomic spectroscopy, 50(14), 1995, pp. 1757-1768
A theoretical analysis is made of the effect of analytical line broade
ning and of non-absorbable radiation in the light source on the shape
of concentration curves in Zeeman graphite furnace atomic absorption s
pectrometry. These results have been used in a systematic study of the
effect of spectrometer slit width and hollow-cathode lamp (HCL) curre
nt on linearization of calibration graphs for 11 elements: Ag, Au, Bi,
Cd, Co, Cu, Fe, Mn, Ni, Pb, and Sb. The effectiveness of linearizatio
n throughout the analytical range covered was estimated experimentally
on series of 25-30 solutions. Three solutions in each series were use
d as standards for constructing the calibration graph, the others serv
ing to evaluate the linearization effectiveness. Increasing the slit w
idth and decreasing the HCL current compared to the standard measureme
nt conditions have permitted us to reach a sufficiently high effective
ness of linearization for all the elements studied, with the exception
of Ni. The maximum deviation of experimental points from the linear g
raph under optimum conditions does not exceed 6%. The effect of the De
lta parameter used in the computational algorithm on linearization eff
ectiveness is investigated.