蓟运河汞污染化学地理特征

通过对蓟运河汞污染化学地理研究,查清了河水沉积物中汞和甲基汞的含量范围,水平和垂直变化,以及空间分布;研究了汞存在的形态;揭示了汞在河流中的富集区;作出了河流汞污染状况的分区,初步提出了治理河道汞污染的途径。

CHARACTERISTICS OF MERCURY-POLLUTED CHEMICAL GEOGRAPHY OF JI YUN RIVER

This is an investigation on pollutant chemogeography in the Ji Yun river basin, aiming at evaluating mercury pollution of that river and providing useful information for mercury control.The river running through Han Gu industrial area to Bo Bay, has a drainage basin of 10000 square km and about 300km long. Its water resources have been used for years for farming irrigation in this basin and there is penstock in the river estuary, which is helpful in forming river-reservoir. Industrial plants more or less concentrate along the lower reaches (Han Gu area) of the river near Tianjin. Industries in this area have discharged wastes to the river for more than 30 years, especially from a chlor-alkali plant. In the aquatic environment mercury is so far the most remarkable contaminant. Its form, content, distribution and transformation in water and sediments have been studied with a view to understand the extent and characteristics ofmercury pollution, as well as the historical development of such a pollution. Samples of water and sediments were taken from upstream all the way to estuary. Results are summarized as follows:1. Distribution of mercury in water and sediments and its seasonal variation.2. The form of mercury in river water and sediments.3. Protection of water resources and the Way for cleaning up bottom sediment, which is polluted by mercury.