Sequential injections in flow system as an alternative to gradient exploitation |
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Authors: | EAG Zagatto MF Giné EAN Fernandes BF Reis FJ Krug |
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Institution: | Centro de Energia Nuclear na Agricultura, Universidade de Sâo Paulo, Caixa Postal 96, 13400 Piracicaba, S. Paulo Brasil |
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Abstract: | In flow injection analysis, several plugs can be injected simultaneously into the same carrier system, in order to achieve overlapped zones. The potentialities of such sequential injections are studied in model systems with spectrophotometric detection; the procedure is shown to give better precision than the use of concentration gradients. The method is used with atomic absorption spectrometry to allow the determination of a wide range of manganese contents in rocks, and to facilitate the use of standard additions for the determination of copper in ethanol. |
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