Atomic Absorption Spectroscopy Using Long Absorption Path Lengths and a Demountable Hollow Cathode Lamp
Long absorption path lengths are obtained by directing the flame from a Beckman atom-izer-burner through a quartz tube as suggested by Fuwa and Vallee. This method and modifications of it are used for the determination of Bi, Cd, Hg, Mg, Mn, Ni, Pb, Sb, Sr, Tl, and Zn in tissues, body fluids, and other samples. Concentrations giving 1% absorption are as low as 0,001 μg/ml for several elements. Solutions of tissue ash are analyzed for Cd, Mg, Mn, Ni, Pb, and Zn without chemical separations. Both oxy-hydrogen and oxy-acetylene flames are used and will be compared. Organic solvents provide greater sensitivity than aqueous solutions for some elements. A demountable hollow cathode lamp is used as a light source. This lamp has a water-cooled cathode and allows rapid changing of elements in a single base. Cathodes for new elements can be prepared quickly and at a very low cost. This source compares favorably in brightness, stability, and sensitivity (line width) with commercial sealed lamps.
KeywordsQuartz Tube Tube Length Atomic Absorption Spectroscopy Hollow Cathode Test Element
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