The data comes from Gansu environmental monitoring center station, which contains three observation elements, namely pH, permanganate index and ammonia nitrogen.
The data format is text file, the first column is city name, the second column is pH, the third column is permanganate index, the fourth column is ammonia nitrogen, and the fifth column is observation date.
It includes the data of 6 sections of gushuizi, Niubei village, Wufosi, Shichuan bridge, Xincheng bridge and Bikou.
Gansu section of the Yellow River: Xincheng bridge (Lanzhou upstream section), Shichuan bridge (Lanzhou Baiyin junction section), Wufosi (Gansu Ningxia junction section), Niubei Village (Gansu Shaanxi junction section). Wudu section of Bailong River: (section of gushuizi Village).
Lanzhou xinchengqiao water quality automatic monitoring station is located in Xigu District of Lanzhou City, which is built in the first tap water plant of Lanzhou city. The coordinates of the point are 103 degrees 35 minutes 02 seconds east longitude and 36 degrees 07 minutes 20 seconds north latitude. The Yellow River System (the main stream of the Yellow River) is a state-controlled provincial boundary section. It is entrusted by Lanzhou environmental monitoring station. The distance is 35 kilometers. It was built in March 2001.
PH: an index to characterize the acidity and alkalinity of water body. When pH value is 7, it is neutral; when it is less than 7, it is acidic; if it is greater than 7, it is alkaline. The pH value of natural surface water is generally between 6 and 9. When algae grow in the water body, the surface pH value will rise due to the absorption of carbon dioxide by photosynthesis.
Permanganate index (CODMn): with potassium permanganate as oxidant, the consumption of surface water samples is expressed in mg / L of oxygen. Under these conditions, potassium permanganate can be consumed by reducing inorganic substances (ferrous salts, sulfides, etc.) and organic pollutants in water, which is often used as a comprehensive indicator of the pollution degree of surface water by organic pollutants. The potassium permanganate method, also known as chemical oxygen demand, is different from the chemical oxygen demand (COD) of potassium dichromate method, which is often used as waste water discharge monitoring.
Ammonia nitrogen (NH3-N): ammonia nitrogen exists in water in the form of dissolved molecular ammonia (also known as free ammonia, NH3) and ammonium salt (NH4 +). The ratio of the two depends on the pH value and water temperature of the water. The content of ammonia nitrogen is expressed by the amount of n element. The main sources of ammonia nitrogen in water are domestic sewage and some industrial wastewater (such as coking and synthetic ammonia industry) and surface runoff (mainly refers to the fertilizer used in farmland entering rivers, lakes and reservoirs through surface runoff).
Manual monitoring
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CSTR:11738.11.ncdc.nieer.2020.1565
10.12072/ncdc.NIEER.db001.2020