黄河兰州段水质现状及污染趋势分析

Study on the Present Condition of the Water Quality and the Pollution Trend in the Lanzhou Section of the Yellow River

通过分析1998～2002年黄河兰州段扶河桥、新城桥、包兰桥、什川桥4个监测站取得的pH值、COD、DO、挥发酚、六价铬、总磷6项水质指标时间序列，初步确定了黄河兰州段水质现状及水环境变化趋势，显示出这6项指标在波动中有上升趋势。

Tnrongh the analysis of six indexes（pH,COD,DO,Cr^6＋ ,phenol and total phosphorus） from four monitoring stations（Fuhe Bridge,Xincheng Bridge,Baolan Bridge and Shichuan Bridge） in the Lanzhou section of the Yellow River from 1998 to 2002,the present condition of the water quality and the changing trend of water environment were discussed.