【摘要】 第二松花江江水、沉积物于１９５８年开始受到严重汞污染，至１９８２年汞污染停止，江水汞污染指数于污染期为１．２，停止汞污染后为０．２；沉积物汞含量在停止汞污染的４．５年中下降５９．９％，平均每年下降１３．３１％。按此下降速率，沉积物的汞含量经３２．５７年可达到背景值水平。更多还原

【Abstract】 The second Songhua River water and deposit were polluted seriously by mercury since 1958.And the pollution stopped in 1982.The mercury pollution index of river water was 1.2 during polluting period,but it was 0.2 after ending mercury pollution,Deposit mercury content has fallen 59.9% during 4.5 years after ending mercury pollution. It has fallen 13.31% a year in average. According to the falling rate,the content of mercury in the deposit will reach the background value after 32.57 years.更多还原