Relationship between Growth of Marbled Flounder (Pleuronectes yokohamae) and Cs Concentration in Their Muscle Determined by ICP-MS

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  • Isoyama Naohiko
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Oikawa Shinji
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Misonoo Jun
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Nakahara Motokazu
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Nakamura Ryoichi
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Suzuki Naoko
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Yoshino Miki
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Suzuki Chiyoshi
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Sato Hajime
    Marine Ecology Research Institute, Head Office, Research & Survey Group
  • Hara Takeya
    Marine Ecology Research Institute, Head Office, Research & Survey Group

Bibliographic Information

Other Title
  • 誘導結合プラズマ質量分析法により定量したマコガレイ筋肉中のセシウム濃度と成長の関連性
  • アナリティカルレポート 誘導結合プラズマ質量分析法により定量したマコガレイ筋肉中のセシウム濃度と成長の関連性
  • アナリティカル レポート ユウドウ ケツゴウ プラズマ シツリョウ ブンセキホウ ニ ヨリ テイリョウシタ マコガレイ キンニクチュウ ノ セシウム ノウド ト セイチョウ ノ カンレンセイ

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Abstract

For the purpose of marine environmental radioactivity monitoring, stable Cs and 137Cs concentrations were obtained from 214 marbled flounder (Pleuronectes yokohamae) samples collected from off the coast of Ibaraki prefecture in Japan in 2005 and 2006. Prior to the investigation, an analytical method for the determination of Cs in muscle of marbled flounder samples by inductively coupled plasma mass spectrometry (ICP-MS) was seriously considered from the view point of sample preparation (wet way) to a Cs measurement. Since major problems in determining Cs by the ICP-MS is the interference of matrix materials and molecular ions on Cs peak area (m/z 133), a known amount of In (m/z 115) was added to the sample solutions as an internal standard. To check the accuracy of the determination, duplication analysis and standard reference materials were used. Analytical results of Cs in muscles samples by ICP-MS agreed well with duplicated samples, and standard reference materials. The standard length and body weight were obtained from a total of 214 flounder samples. The stable Cs, stable K and 137Cs concentrations in muscle were determined by ICP-MS, flame photometry and radiochemical analysis, respectively. The mean standard length correlates closely with the mean body weight. The stable Cs concentration was in proportion to the body weight, also, the 137Cs concentration correlated closely with the stable Cs concentration in muscle. On the other hand, a stable K concentration was found to be uniform, and unrelated with 137Cs and stable Cs concentrations. The specific activities, the ratio of 137Cs/stable Cs in muscle, was found to be 5.5∼6.7 with an average of 6.2±0.35 (SD) among five different size groups of the standard length of marbled flounder samples. From these results, ICP-MS provided useful tools for the determination of a trace amount of Cs in muscle samples, combined with wet way pretreatment techniques. In addition, marbled flounder proved to be a useful species for comparing the radioactivity of fishes in coastal seas around Japan with each other in the environmental radioactivity monitoring program.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 57 (9), 763-769, 2008

    The Japan Society for Analytical Chemistry

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