Analytical Techniques: Atomic Absorption Spectrometry
Darryl D. Siemer, Westinghouse Idaho Nuclear Company
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General Use |
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- Quantitative analyses of approximately 70 elements |
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Examples of Applications |
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- Trace impurities in alloys and process reagents |
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- Water analysis |
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- Direct air sampling/analysis |
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- Direct solids analysis of ores and finished metals |
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Samples |
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- Form: Solids, solutions, and gaseous (mercury) |
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- Size: Depends on technique used - from a milligram (solids by graphite furnace atomic absorption spectrometry) to 10 mL of solution for conventional flame work |
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- Preparation: Depends on the type of atomizer used; usually a solution must be prepared |
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Limitations |
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- Detection limits range from subparts per billion to parts per million |
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- Cannot analyze directly for noble gases, halogens, sulfur, carbon, or nitrogen |
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- Poorer sensitivity for refractory oxide or carbide-forming elements than plasma atomic emission spectrometry |
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- Basically a single-element technique |
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Estimated Analysis Time |
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- Highly variable, depending on the type of atomizer and technique used |
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- Sample dissolution may take 4-8 h or as little as 5 min |
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- Typical analysis times range from approximately 1 min (flames) to several minutes (furnaces) |
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Capabilities of Related Techniques |
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- Inductively coupled plasma atomic emission spectrometry and direct current plasma atomic emission spectrometry are simultaneous multielement techniques with a wider dynamic analytical range and sensitivities complementing those of atomic absorption spectrometry. They cost considerably more to set up and require more expert attention to potential matrix interference (spectral) problems |
Reprinted with permission of ASM International®.
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