原子吸光法による海産生物中の水銀分析における二，三の改良

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タイトル別名
  • Some improvements for mercury determination in marine organisms by atomic absorption spectrometry
  • ゲンシ キュウコウホウ ニヨル カイサン セイブツチュウ ノ スイギン ブンセ

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Mercury in marine organisms (sharks and marine plants) was determined by cold vapor atomic absorption spectrometry. For wet digestion procedure, a newly designed long-neck flask was used instead of the conventional, water-cooling digestion apparatus. To assess the new digestion apparatus, recovery experiments were carried out. Certain amounts of mercury compounds (HgCl2 and CH3HgCl) were added to muscle and liver of shark, and marine plant. And they were digested with two different combinations of digesting reagents; HNO3-H2O2 and HNO3-H2SO4-HClO4. All the recoveries were between 92 and 110%. HNO3-H2SO4-HClO4 digestion procedure was more suited for the hard sample to digest, such as liver, than HNO3-H2O2. NBS biological materials, Bovine Liver (SRM 1577) and Albacore Tuna (RM 50), were used in the assessment of the entire process of this method. Good agreement with NBS values verified the accuracy of our method. Because of simplicity and low price, the long-neck flask is quite effective for the digestion. When our method was applied to marine plants, iodate existing in the digest interfered with reduction of mercury by stannous chloride. By diminishing the amount of aliquot for measurement or by increasing the amount of reducing agent (SnCl2), this interference could be avoided. Then mercury in marine organisms was determined by the present method. It was found that muscle was the highest (0.929μg/g, wet weight) in mercury concentration among several body parts of a shark. Concentration of mercury in five species of marine plants from the same location was proved to be in the range of 7 to 20 ng/g, wet weight.

収録刊行物

  • 分析化学

    分析化学 28 (7), T33-T38, 1979

    公益社団法人 日本分析化学会

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