The contents and chemical forms of mercury in sediments from Kagoshima Bay, in comparison with Minamata Bay and Yatsushiro Sea, southwestern Japan
The contents and chemical forms of mercury in sediments from Kagoshima Bay, in comparison with Minamata Bay and Yatsushiro Sea, southwestern Japan
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鹿儿岛湾沉积物中汞的含量和化学形态与日本西南部水俣湾和八代海的比较
DOI：
10.2343/geochemj.29.97
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发表时间：
1995
影响因子：
0.8
通讯作者：
Norinobu Yonehara
中科院分区：
文献类型：
--
作者：
H. Sakamoto;T. Tomiyasu;Norinobu Yonehara
采用连续萃取-冷原子吸收光谱法对鹿儿岛湾、水俣湾和八代海沉积物中的有机汞、氧化汞、硫化汞和残留汞进行了分析。结果表明，汞（II）硫化物（38.4 × 96.1%，几何平均值71.4%）是沉积物中最常见的汞化合物，其次是汞（II）氧化物（<0.9 × 42.9%，几何平均值5.65%）。有机汞含量非常低（0.21 - 12.8%，几何平均值2.55%）。沉积物中残留汞的含量范围很广（2.6 ± 44.3%，几何平均值10.5%）。鹿儿岛湾北方沉积物中汞含量异常高是由沉积在表层沉积物中的元素汞和硫化氢等海底气态汞的冷凝作用造成的。这与硫化汞（II）是最普遍的汞化合物这一事实雅阁。海底火山口附近的有机汞含量很高，那里的硫化汞（二）含量非常高。
Sediments collected from Kagoshima Bay, Minamata Bay and Yatsushiro Sea were analyzed for organic mercury, mercury(II) oxide, mercury(II) sulfide and residual mercury through sequential extraction followed by cold vapor atomic absorption spectrometry. Results show that mercury(II) sulfide (38.4∼96.1%, geometric mean 71.4%) is the most prevalent mercury compound in the sediments followed by mercury(II) oxide (<0.9∼42.9%, geometric mean 5.65%). Organic mercury is present only in a very small quantity (0.21∼12.8%, geometric mean 2.55%). Residual mercury shows a wide range of content in the sediments (2.6∼44.3%, geometric mean 10.5%). The abnormally high mercury concentration observed in the sediment samples from Northern Kagoshima Bay is caused by the condensation of submarine fumarolic gases including elemental mercury and hydrogen sulfide, which are depositing in the surface sediments. This is in accord with the fact that mercury(II) sulfide is the most prevalent mercury compound there. Organic mercury content is high in the vicinity of the submarine fumarole, where mercury(II) sulfide content is very high.