Some Experimental Considerations in Atomic Absorption
A study of the various parameters that must be optimized for the best atomic-absorption analysis has been made. Two of the instrument variables we have investigated are the burner and hollow-cathode lamp. A comparison of the total consumption and laminar flow burners for Fe, Mg, and Pb is given, evaluating sensitivity, analytical precision, and possible interferences. A study of hollow-cathode lamps is also presented in which single and multielement types are operated both with ac current and with dc current in conjunction with a chopper. The effects of various lamps and their manner of operation on sensitivity and precision are given for the analysis of aqueous solutions for Fe, Mg, Pb, and Ca. For Fe, e.g., a change from 0.065 to 0.305 absorbance units was obtained for a 10 ppmaqueous standard, depending on the choice of lamp and whether it was used with ac or dc. Advantages and disadvantages of the various possibilities are discussed.
KeywordsAnalytical Precision Absorbance Unit Premix Burner Analytical Curf Instrument Variable
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