水銀の毒性に関する研究 (Hg Series No. 7)

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タイトル別名
  • Studies on the toxicity of mercury (Hg Series No. 7)
  • スイギン ノ ドクセイ ニ カンスル ケンキュウ 2
  • 2nd report: On the present status of mercury contamination in environment and foodstuffs
  • 第2報 環境および食品のHg汚染

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Since the discovery of the effectiveness of phenylmercury compounds for controling the rice fungus disease, “rice blast”, the consumption of mercury in the rice field has been tremendously increased in these ten years.<br>The mercury contamination of foodstuffs, water and soil has recently become the serious problem from the standpoint of public health.<br>As Stock in Germany reported in 1934, the environment and foodstuffs were proved to contain minute amount of mercury which had come from natural sources such as the soil or fuel exhaust. Such natural contaminations will change in different places and periods according to their industrialization and urbanization.<br>The purpose of this study is to confirm the present status of mercury contamination in daily life in Japan, serving as the basic data for the comparison in the near future.<br>1. The concentration of mercury in environmental air ranged 1.2∼18.0μg/m3 in urban area, and it seemed to increase in proportion to the car traffic volume. In the quiet area isolated from the traffic, such as in parks and on the roof-garden of building, it was similar to that of rural area. (1.2∼2.4μg/m3).<br>2. Mercury concentrations in rivers and ditches in Tokyo were approximately ten times as high (0.004∼0.1ppm) as that of rural area, indicating the contamination from industrial waste.<br>3. In rain and snow, 0.0006ppm of mercury was found in urban area.<br>4. For the soil, the figures were 0.018∼0.02ppm in dust on the streets with heavy traffic in Tokyo, 0.36∼0.38 in soil of field and paddy rice field in rural area.<br>5. Polished and unpolished rice reported as being treated with organic mercurials against the rice blast showed relatively high values ranging 0.03∼0.14. Especially, rice bran contained 0.21∼ 2.3ppm of mercury, suggesting the fat-soluble property of organic mercury. The figures in refined wheat flour and its bran components were approximately similar (0.05∼0.06ppm).<br>6. In vegetables and fruits, the figures were comparatively constant (0.05∼0.06ppm).<br>7. Meat, egg, dairy products and fish contained mercury less than 0.1ppm.<br>8. Extraordinary high values were found in chicken (0.16), egg yalk (0.3∼0.7) and tuna meat (0.5ppm).<br>The origin of high mercury content was unknown but in chicken and egg, the rice bran used in feed was to be suspected.

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