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Determination of Trace Amounts of Molybdenum in Rainwater and Snow by Graphite-Furnace Atomic Absorption Spectrometry after Solvent Extraction and Micro-Volume Back-Extraction

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Abstract

A method for the determination of trace amounts of molybdenum at ng 1−1 levels in rainwater and snow is described. Molybdenum is extracted into xylene as a complex of N-benzoyl-N-phenylhydroxylamine (BPA), and subsequently back-extracted into 100 μl of nitric acid for a determination by graphite-furnace atomic absorption spectrometry (GFAAS). The extraction and micro-volume back-extraction allows molybdenum to be concentrated about 6000-fold. The back-extracted solution is suitable for the determination of molybdenum by GFAAS. The conditions of extraction and back-extraction, such as acidity, concentration of BPA, and amount of nitric acid, were investigated. The detection limit for molybdenum is 0.54 ng I−1 based on a 1700-fold preconcentration. The application of this method to the determination of molybdenum in various samples of rain-water and snow is demonstrated.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, Ishii-cho, Utsunomiya, 321, Japan

    Yoshio Shijo, Masahito Suzuki, Tokuo Shimizu, Sachiko Aratake & Nobuo Uehara

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  1. Yoshio Shijo
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  2. Masahito Suzuki
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  3. Tokuo Shimizu
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  4. Sachiko Aratake
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  5. Nobuo Uehara
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Shijo, Y., Suzuki, M., Shimizu, T. et al. Determination of Trace Amounts of Molybdenum in Rainwater and Snow by Graphite-Furnace Atomic Absorption Spectrometry after Solvent Extraction and Micro-Volume Back-Extraction. ANAL. SCI. 12, 953–957 (1996). https://doi.org/10.2116/analsci.12.953

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  • DOI: https://doi.org/10.2116/analsci.12.953

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