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

  • SHIJO Yoshio
    Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University
  • SUZUKI Masahito
    Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University
  • SHIMIZU Tokuo
    Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University
  • ARATAKE Sachiko
    Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University
  • UEHARA Nobuo
    Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University

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  • Determination of Trace Amounts of Molyb

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Abstract

A method for the determination of trace amounts of molybdenum at ng l-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 100μl 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 0.54ng l-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.

Journal

  • Analytical Sciences

    Analytical Sciences 12 (6), 953-957, 1996

    The Japan Society for Analytical Chemistry

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