Metal contamination in campus dust of Xi'an, China: a study based on multivariate statistics and spatial distribution.
[2023-02-02 17:11:49]
Shaanxi Normal University Tourism Environment School, Xi'an City 7100-062 China Electronic address: luxinwei@snnu.edu.cn
Department of Civil Engineering, University of British Columbia, Vancouver V6T 1Z4, Canada. Electronic address: lli@civil.ubc.ca
The contents of As, Ba, Co, Cr, Cu, Mn, Ni, Pb, V, Zn in the dust of Xian's kindergartens, elementary school, junior high school and university were measured by fluorescent X-ray spectroscopy. Analyzed the data using correlation coefficient analysis, principal component analysis (PCA) and cluster analysis (CA) to identify possible sources of these metals in the dust. Using the geostatistical method, the spatial distribution of metal in the dust of Xi'an City was analyzed according to the metal concentration in the campus dust. The results show that metal concentrations in the dust samples from the campus, especially Pb, Zn, Co, Cu, Cr and Ba increased and the average value reached 1, 6, 7, 9, 5 and 9 of Shaanxi soil background values It was doubled. Each. Concentration coefficient results showed that Mn, Ni, V, As and Ba in the campus dust lack microconcentration. It was primarily affected by natural and anthropogenic origin, but Co, Cr, Cu, Pb and Zn in the campus dust are affected. Impact In particular, lead and zinc are mainly affected by human activities. As and Cu, Mn and Ni, Ba and V, and Pb and Zn have similar distribution patterns. Most of the metal levels in the Southwest High Tech Industrial Zone and Southern Commerce and Residential Areas are relatively high. Based on the correlation coefficient analysis, three main causes were identified from the characteristics of PCA, CA, and spatial distribution. Because Ni, Cu, Mn, Pb, Zn and Cr have mixed origins such as natural combustion, transportation, combustion of fossil fuels and weathering of materials. Ba and V are mainly of natural origin, but are partly from industrial waste and building sources, Co is mainly derived from construction.
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.
Summary of Akari Metal Contamination in Roadside Soil Six soil samples collected from the roadside are expected to show characteristics of road salt contamination. This contamination is characterized by the presence of magnesium, calcium and sodium. We examined the relationship between alkali metal concentration and road surface distance and judged that it does not exist. - The influence of organic agriculture on soil nutrition and structural engineering has been overlooked Since the 1970s agribusiness and pesticide industry are increasingly aware of serious problems: As the world's population soars, the world's Soil is increasing more and more Not suitable for agricultural erosion, depletion of nutrients, structure deterioration
Soil pollution is a major problem in the world. In China, nearly 20% of arable land is contaminated with toxic heavy metals. Soil pollution threatens food security and brings health risks to local residents. What you can do: Many solutions to air pollution are similar to climate ch