Mercury in Kagoshima Bay from volcanisms of Mt.Sakurajima - A different health effect between eruptive and man-made mercury -

为了解樱岛和南俣黑尾湾环境中的汞含量，对樱岛和南俣黑尾湾的海水、沉积物和贝类样品进行了汞含量测定。分析了鹿儿岛湾26个站位海水汞含量的季节变化和局地变化。此外，樱岛、大宇和宝良居民血清二十碳五烯酸（EPA）和发汞含量均高于其他地区。测定了此外，还对海水中总汞和甲基汞的几种定量分析方法进行了考察，以验证汞含量的重现性，简化其分析程序。鹿儿岛湾26个测站海水中汞含量为0.1- 3.2ng/L，低于以往报道的值。海水汞含量与温度和pH值均呈显著相关，冬季海水汞含量高于夏季。将26个测站划分为海湾入口、中部和内部4个区域，樱岛附近海域和内部的汞含量仅在冬季高于海湾入口和内部。在南俣湾，低潮和高潮时表层海水和深层海水的汞含量分别为1.2-5.0和1.2-1.7 ng/L;高潮时表层海水和深层海水的汞含量分别为1.8-5.4和1.6- 4.2 ng/L。水俣湾蓝贻贝的汞含量为23- 67 ng/g，显著高于樱岛湾蓝贻贝的汞含量4-14 ng/g。樱岛居民的发汞（11.4 μ g/g）和血清EPA（90 mg/L）含量最高。Akagi和Nishimura（1991）报道的海水中总汞和甲基汞定量分析的有效方法在汞化合物的提取和浓缩过程中被部分简化。

Mercury contents of samples of sea water, and sediments and shellfish at seashores from Sakurajima Island and Minamata-Fukuro Bay were measured to find mercury levels in their environments. Mercury contents of sea water samples at 26 stations in Kagoshima Bay were also analyzed for their seasonal and local variations. Moreover, contents of either serum eicosapentaenic acid (EPA) or hair mercury of the habitants of Sakurajima, Iou and Takara Is. were measured. Furthermore, several methods of the quantitative analyzes of both total and methylmercury in sea water were examined for certifying the reproducibility of mercury contents and simplifing their procedures. Mercury contents of sea water at 26 stations from Kagoshima Bay were 0.1-3.2 ng/L, and lower than the values reported before. There was a significant correlation between mercury contents and the values of either temperature or pH of sea water and mercury contents of those in winter were higher than those in summer. Twenty six stations were classified into four areas, the entrance, the middle and the interior of the Bay, and the water around the Sakurajima area mercury contents of the samples from the last area and the interior were higher than either at the entrance or in the interior of the Bay only in winter. At Minamata-Fukuro Bay, mercury contents of sea water from the surface and depths in low and high tides were 1.2-5.0 and 1.2-1.7, and 1.8-5.4 and 1.6-4.2ng/L, respectivery. Mercury contents of a blue mussel, from Minamata-Fukuro Bay were 23-67ng/g, were significantly higher than those from Sakurajima, were 4-14 ng/g. The highest contents of either hair mercury (11.4 mu g/g) or serum EPA (90mg/L) were found in habitants of Sakurajima.The effective methods of the quantitative analyzes of total and methylmercury from sea water, reported by Akagi and Nishimura (1991) were changed for the easier partly in the procedures of extraction and concentration of mercury compounds.