黄河兰州段水质周年理化参数监测分析

通过对黄河兰州段进行周年理化检测分析，掌握其变化规律，以期为水质监控提供理论依据．研究表明。黄河兰州段水环境理化参数随着不同采样点与季节的变化而不同，水体温度随季节间变化剧烈，在1．8。18℃之间。夏季温度最高，冬季温度最低；水体呈弱碱性，pH值在8．3～8．6之间；关键水质监测参数分析发现水质类别为II～111类，其中II类水质占83％，Ⅲ类水质占17％，包兰桥断面的水质相对较差．

The Detection and Analysis of the Physical and Chemical Parameters of Lanzhou Section of the Yellow River

To provide a theoretical basis for the water quality monitoring, many physical and chemical parameters have been detected and analysed as well as its change rule. The results show that the parameters of Lanzhou section of the Yellow River are different in different sampling locations and seasons. The water temperature has a severe change in different seasons, ranged between 1.8 and 18.2 ℃ which has a maximum value in summer and a minimum value in winter. The pH value is between 8.3 and 8.6,which is to say that the water is alkalescent. Through the analysis of the key parameters, 83% of the water is rated Class II water quality standards and 17% of the water belongs to Class III. It＇s worth mentioning that the water quality of Baolan section of the Yellow River is relatively weak.