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- W2022254112 abstract "Abstract During the warm-up period of single slot burners, changes in the geometry of the nitrous oxide supported acetylene flame (NOAF), and in the population of atoms in it, have been observed and investigated. Titanium, aluminium and silicon were chosen to demonstrate the effects of those changes. It was found that the width and the velocity of the stream of gases leaving the slot change as the temperature of the burner increases. These changes adversely affect the population and spatial distribution of atoms in the flame: they decrease the sensitivity and, for some elements, even the atomization efficiency, by decreasing residence time; and they increase the curvature of the analytical curves by narrowing the zone of densest atom population. A thermostated burner head, whose design is described, brought about the following improvements: (1) The drift in the sensitivity during the operation of the NOAF was greatly reduced and the danger of flashback was practically eliminated. (2) The flame, and particularly the zone of densest atom population, was widened. Thus the light beam of the spectrophotometer at normal aperture exclusively sampled this zone when adjusted to optimal height, and analytical curves could be obtained which were linear up to high absorbances. (3) The velocity of the stream of gases and sample spray was kept at a minimum, increasing the atomization efficiency for titanium. Improved efficiency of atomization led to slight enhancement of the absorbance for calcium in the presence of aluminium even in a system buffered against variations in the degree of ionization." @default.
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- W2022254112 title "The effectsof burner temperature on atomic absorption spectroscopy with the nitrous oxide-acetylene flame" @default.
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- W2022254112 doi "https://doi.org/10.1016/0584-8547(71)80030-7" @default.
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