Identifying Hot-Spots of Metal Contamination in Campus Dust of Xi'an, China.
[2023-06-15 22:23:15]
Shaanxi Normal University Faculty of Tourism and Environment in Xi'an, 7100-062 China chenhao 8848@126.com
710062 China Xian Shaanxi Normal University Faculty of Tourism and Environment Studies luxinwei@snnu.edu.cn
Shaanxi Normal University College of Tourism and Environment, Xi'an, Tianning 710-062 China tianning_gao@sina.com
710062 China Xian Shaanxi Normal University Faculty of Tourism and Environmental Studies changyuyu@snnu.edu.cn
The concentrations of heavy metals (As, Ba, Co, Cr, Cu, Mn, Ni, Pb, V, Zn) in the dust of campuses in kindergartens, elementary school, junior high school and university in Xi'an, China were determined by fluorescent X-ray spectroscopy. Metallic contamination levels and hot spots were analyzed using the Geological Accumulation Index and Local Moran's I (Individual Spatial Correlation Indicator), respectively. Metal concentrations of dust samples from campus, especially Pb, Zn, Co, Cu, Cr, Ba are higher than background level. Contamination assessment is based on the fact that campus dust is not contaminated with As, Mn, Ni or V, moderate or unaffected by Ba and Cr, and moderately contaminated with Co, Cu, Pb and Zn It shows that it is. Local Moran's I analysis detects the location of spatial clustering and outliers and the contamination of these ten kinds of metals occurs even in important high-high spatial clusters, low-high, even high-low spatial outliers It showed that. Cu, Mn, Ni, Pb, V and Zn have important high-high modes in the center of Xi'an. High-tech industries in the western and southwestern regions of the survey area contribute greatly to the Co content in the campus dust.
Most of Arctic heavy metal contamination is due to hotspot emissions. These are the industries of Pechenganikel Industrial Park, Severonickel Smelter and Norilsk on the Kola Peninsula. In the 1980s, Severonickel became the world's largest nickel-copper smelter. The initial estimate of Severonickel's release to the atmosphere is about 3,000 tons of copper per year and 2,700 tons of nickel per year, but we need to verify this information. Most emissions and simulation studies were conducted based on data from the early 1980s. Since then, most metal inputs seem to be decreasing; see the chart below. Further improvements are also possible. By using BAT, we can reduce arsenic emissions by a third, by the end of this century, cadmium emissions to one-half. For lead, the reduction depends on the rate at which leaded gasoline disappears from use.
The concentrations of heavy metals (As, Ba, Co, Cr, Cu, Mn, Ni, Pb, V, Zn) in the dust of campuses in kindergartens, elementary school, junior high school and university in Xi'an, China were determined by fluorescent X-ray spectroscopy. Metallic contamination levels and hot spots were analyzed using the Geological Accumulation Index and Local Moran's I (Individual Spatial Correlation Indicator), respectively. Metal concentrations of dust samples from campus, especially Pb, Zn, Co, Cu, Cr, Ba are higher than background level. Contamination assessment is based on the fact that campus dust is not contaminated with As, Mn, Ni or V, moderate or unaffected by Ba and Cr, and moderately contaminated with Co, Cu, Pb and Zn It shows that it is. Local Moran's I analysis detects the location of spatial clustering and outliers and the contamination of these ten kinds of metals occurs even in important high-high spatial clusters, low-high, even high-low spatial outliers It showed that.