Electrothermal atomic-absorption spectrometric analysis of lake waters for Mn, Fe, Pb and Cd |
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Authors: | Nagourney S J Heit M Bogen D C |
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Affiliation: | Environmental Measurements Laboratory, U.S. Department of Energy, 376 Hudson Street, New York, NY 10014, U.S.A. |
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Abstract: | Analyses have been made for trace metals in surface waters from lakes known to be sensitive to inputs of acidic deposition. Electrothermal atomic-absorption spectrometry was used for direct measurement of the low metal concentrations. The studies revealed non-spectral interferences resulting from small amounts of inorganic material in the sample matrix that prevent accurate measurements of Mn and Pb. Several types of interferences were identified by means of a computer coupled to the atomic-absorption spectrometer and procedures to overcome them were evaluated. Matrix modification with nitric acid is required for the determination of Mn. Atomization from a platform inserted within the graphite tube is necessary for interference-free Pb determination. |
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