TY - JOUR
TI - Study on temporal and spatial distribution characteristics of urban non-point source pollution in Hohhot
AU - Jia Pei-Qi
AU - Zhou Hang
AU - Zhang Peng
AU - Zhang Jia Wen
AU - Zhang Chen-Qi
AU - Zang Chen
AU - Liu Yu-Qi
AU - Xiang Ya-Jun
AU - Bao Jun-Jiang
AU - Mei Ying
JN - Thermal Science
PY - 2023
VL - 27
IS - 3
SP - 2065
EP - 2073
PT - Article
AB - The non-point source pollution is not easy to be controlled, and it is one of  the important environmental problems facing the world. Taking Hohhot, a  typical city in the arid semi-arid region in China, as an example, four  monitoring sites in the city were selected, water samples from six rainfall  events were collected, and pollutants such as heavy metals, ammonia, nitrate  nitrogen, phosphorus and suspended matter were examined, and the water  quality of the rain runoff was comprehensively evaluated by the principal  component analysis and the correlation analysis. The results showed that the  total phosphorus contents of monitoring points in the street were the  largest and those of monitoring points in gas stations were the smallest in  rainfall runoff. Arsenic, cobalt, and chromium were less than the Class I  standard for environmental quality standards for surface water according to  Chinese standard (GB 3838-2002). Concentrations of cadmium, copper, and  iron were greatest in street monitoring sites, while nickel, lead, and zinc  were greatest in roof monitoring sites, and manganese was greatest in car  park monitoring sites. There was minimal contamination at gas station  monitoring sites and the greatest contamination at street monitoring sites.  Heavy metals and phosphorus were the main contributing factors to pollution  at street monitoring sites, while the main contributing factors at gas  station monitoring sites were total suspended substances.