Abstract
An investigation of the atomic-absorption behavior of bismuth was undertaken, using the 3067.72-Å line of bismuth. Optimum operating conditions were determined, then a flame-intensity profile was obtained, an analytical curve prepared, the sensitivity and limit of detection determined, and interference studies were carried out. The instrument used was an 0.5-m Ebert-mounted monochromator using ac electronics with a Sargent model S-72150 multirange recorder for readout. A bismuth hollow cathode and a Beckman medium-bore oxyacetylene burner were used. Optimum flow rate of the oxygen was 2.22 liter/min and the acetylene flow rate was 4.10 liter/min. These flow rates were quite critical. With a single burner and a single optical pass through the flame, the analytically useful range was 1–400 μg Bl/ml (in two steps) using a 1: 1 (volume/volume) acetone-water solvent system. The sensitivity was found to be 2.0 μg/ml and the limit of detection was approximately 1 μg/ml. Interference studies were conducted with the metals Ag, As, Cd, Cu, Hg, Ni, Pb, Sb, Sn, and Zn, all of which are commonly found associated with bismuth in ores and alloys. None of these metals were found to interfere with the Bi determination.
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