【摘要】 为研究松花江水中总汞含量的时空分布特征,分别于2005年春汛期(4月)和夏汛期(8月)对松花江白山至同江江段进行了采样分析.结果表明,总汞含量为0.021~0.173μg·L-1,均值为0.096μg·L-1.总体上来讲,五棵树至白石江段江水中的总汞浓度较高.另外,由于附近金矿的汞排放,红石水库的总汞含量也较高,达到了0.111μg·L-1.总汞含量呈现明显的年内季节性变化和年际变化特征,主要表现为夏汛期总汞含量高于春汛期,1975~2005年总汞含量总体上呈下降趋势.经调查分析,沉积物再悬浮作用及其向水中的汞释放是导致松花江水总汞时空分布变化的主要原因,江水中较高的汞含量可能仍将维持较长的时间.更多还原

【Abstract】 The total mercury (T-Hg) in water was measured in both spring flood season (April) and summer flood season (August) to characterize its spatial and temporal distribution in Songhua River. The results showed that T-Hg concentrations ranged from 0.021 μg·L~ -1 to 0.173 μg·L and centered on an arithmetic mean of 0.096 μg·L~ -1 . Overall, T-Hg concentration was comparatively higher in the reach from Wukeshu to Baishi. It was higher in Hongshi Reservoir (0.111 μg·L~ -1 ) than that in Baishan Reservoir due to the gold mining nearby. T-Hg concentration demonstrated obvious seasonal variation, and it presented higher level during summer flood season than that during spring flood season. Compared with the historical data, the concentration of T-Hg generally declined since 1975. In conclusion, sediments resuspension and the release of mercury from sediments exert a significant influence on the spatial and temporal distribution character of the T-Hg concentration in water of Songhua River. Release of mercury lead can be slowly, but steadily, and the high concentration would last for a long time.更多还原