三峡大坝截流前后长江中上游江段水化学特性的初步调查

1997-1998年,在三峡大坝截流前后,对长江中上游地区十多个江段及若干个支流进行了多次的水质监测分析。结果表明:长江中上游水资源丰富,但污染较严重。从多项数据指标分析结果和多项资料表明,目前污染源主要为沿江工业和城市生活污水。长江干流污染远高于支流(嘉陵江除外).而大江截流对长江中上游的水质近期影响较小,可以忽略不计。  

PRELIMINARY REPORT ON PHYSICO-CHEMICAL PROPERTIES OF MAIN CHANNEL AND TRIBUTARIES IN UPPER AND MIDDLE REACHES OF THE CHANGJIANG RIVER, BEFORE AND AFTER DAMMING OF THE THREE GORGES PROJECT

This paper dews with the physico-chemical properties of lake water and their seasonal changes during 1997—1998 in upper and middle reaches of the Changjiang River. The result are summarized as follows: 1. The normal conditions of water quality were: Water temperature was 16.93℃, S ecchi transparency (cm)—damming before was 11, damming after was 19.57. pH damm ing before was 8.4, damming after was 8.14. conductivity was 322.5μs/cm. Alkali nity, as CaCO3 was 118.69mg/l. Hardenss was 9.26 Germany Degree. Chemical oxyg en demand was 1.84mg/l.; 2. The contents (mg/l) of nutrient elements were: NH4-N 0.226, NO2-N 0.023, NO3-N 0.748, Total nitrogen 1.299, Total phosphorus 0.194, PO4-P0.049, silic ate 3.898.