Graphite Furnace Atomic Absorption Spectrometry of Trace Amount of Molybdenum in Sea Water

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  • 海水中の微量モリブデンの黒鉛炉原子吸光分析
  • カイスイチュウ ノ ビリョウ モリブデン ノ コクエンロ ゲンシ キュウコウ
  • Studies on Environmental Analysis (Part 45)
  • 環境分析に関する研究 (第45報)

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Abstract

Determination of molybdenum in sea water was studied by graphite furnace atomic absorption spectrometry (GFAAS).<BR>Molybdenum ions were preconcentrated by a coprecipitation using Fe(III) and sodium diethyldithiocarbamate (DDTC) at pH 3. Molybdenum was selectively dissolved from the coprecipitate with 30 ml of hydrogen peroxide (3.0%) by heating on a hot plate. The solution was made up to 100 ml with distilled water, and was used as the sample solution for GFAAS.<BR>The linear range of calibration curve was from 2 to 20μg/l, and the detection limit for molybdenum was 0.5μg/l, the lower limit of determination was 1.7μg/l in the case of using 500 ml of sample water.<BR>Molybdenum concentration of sea water was determined by calibration curve method to be 9.8μg/l, which was in agreement with the value (10.2μg/l) by standard addition method. The relative standard deviation in respective five determinations of sea water was 2.3%.<BR>This method was satisfactorily applied to the determination of molybdenum in sea water.

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