摘要
本文较全面地探讨了除河口地区外,长江水系河水的物理化学条件,计算获得了河水的化学稳定性,酸和碱缓冲容量,表征了河水化学条件的区域分异特征,并对影响河水物理化学条件的因素进行了分析。
The temperature of the water in the Changjiang River System (except the mouth region), as well as DO, pH, COD, total salts, hardness, chemical types, chemical stability, alkali capa-city and acid capacity are studied in this paper. The results show that the water temperature gradually from the source region to the lower reaches and so does the hardness. The water in most places belongs to soft water with the hardness < 8 (German). The pH values are from 8.4 to 7.6 in the main river. The highest pH, 9.0, is in Zhi Men Da of the Tongtian River and the lowest, 7.0, in the Tongting Lake System.
The results also show that COD in river water is generally within the range of 1.5-2.0 mg/1 which is not high. According to the difference in the contents of total salt, the river wa-ter is divided into six regions. They are the lowest-content region (<80 mg/1), the second lo-west-content region (80-160 mg/1), the lower content region (160-240 mg/1), the middle-le-vel content region (240-320 mg/1), the high content region (320-500 mg/1) and the highest content region (>500 mg/1). According to the difference in chemical types, the river water can be divided into 9 regions. The chemical types in the Changjiang River System are compli-cated and more than 20 varieties.
Most river water is dissolution-erosional, and the alkali capacity is rather low, i.e. <0.5 m.e/1, While the acid capacity is rather high, i.e. > 0.5 m.e/1.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1992年第3期220-232,共13页
Acta Geographica Sinica
关键词
长江
地球化学
稳定性
Changjiang River system
River water
Geochemistry
