Determination of heavy metals in industrial wastewater by internal standard ICP-AES.

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  • 内標準法を用いる誘導結合プラズマ発光分析法による工場排水中の重金属の定量
  • ナイヒョウジュンホウ オ モチイル ユウドウ ケツゴウ プラズマ ハッコウ ブ

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Abstract

Zinc, lead, iron, manganese, chromium, copper and aluminium in various industrial wastewater samples were determined by ICP-AES. The values (y) obtained by the conventional ICP-AES method were found to be less than those (x) obtained by flame AAS, which is specified in Japan as the official method of analysis for metals in industrial wastewater, when the acid-digested sample solutions were aspirated without dilution. The relationship between x and y could be expressed by the following equation:y=0.88x-0.01 (r=0.997, n=120). This discrepancy in the analytical data obtained by the two methods seemed to be caused by physical interference, i.e., the viscosity of the solutions. Thus, the internal standard and multiple dilution methods for ICP-AES were attempted. The values obtained by these methods agreed well with those obtained by flame AAS. The relationship between the analytical values by internal standard ICP-AES (y') and those by flame AAS was shown as follows: y'=1.03x+0.09(r=1.000, n=50). The internal standard ICP-AES is more highly recommended as a simple and widely applicable method for the determination of heavy metals in industrial wastewater than multiple dilution ICP-AES which requires successive dilution of each sample for at least two times until the constant analytical value can be obtained.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 40 (5), T101-T106, 1991

    The Japan Society for Analytical Chemistry

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