Preconcentration with a solvent-soluble membrane filter and a spectrophotometric determination of trace thiuram in water.

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  • 溶媒可溶性メンブランフィルターを用いる水中の微量チウラムの前濃縮／吸光光度定量
  • ヨウバイ カヨウセイ メンブラン フィルター オ モチイル スイチュウ ノ ビ

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Abstract

A simple and rapid preconcentration and spectrophotometric method was proposed for the determination of trace thiuram in water using a solvent-soluble membrane filter. Less than 80 μg of thiuram in 500 cm3 of a sample solution acidified with sulfuric acid was converted into a light-yellow complex in the presence of a large excess of copper (II) and ascorbic acid at pH 6. The complex was retained rapidly and quantitatively on a cellulose nitrate membrane filter by filtration under suction. The filter was quickly dried with a hair dryer and dissolved in 3 cm3 of 2-methoxyethanol which contained a small volume of concentrated sulfuric acid. The solution was heated with a hot-water bath for about 30 s. The color of the complex became deep-yellow showing an absorption max-imum at 390 nm. The absorbance of the solution was measured at the absorption max-imum against a reagent blank. Beer's relationship was obeyed over the concentration range from 50 to 160 μg dm-3 of thiuram. The detection limit was 1 μg dm-3 for three-times the standard deviation of the blank basis. High concentrations of Ca2+, Mg2+ Na+, K+, Al3+, Cl-, SO42 and NO3-, and sub-mg dm-3 levels of Fe3+ did not inter-fere with the determination. The recoveries of thiuram added to river water and ground water were satisfactory.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 46 (2), 107-111, 1997

    The Japan Society for Analytical Chemistry

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