Identifying Hot-Spots of Metal Contamination in Campus Dust of Xi'an, China.
The concentrations of heavy metals (As, Ba, Co, Cr, Cu, Mn, Ni, Pb, V, and Zn) in campus dust from kindergartens, elementary schools, middle schools, and universities in the city of Xi'an, China, were determined by X-ray fluorescence spectrometry. The pollution levels and hotspots of metals were analyzed using a geoaccumulation index and Local Moran's I, an indicator of spatial association, respectively. The dust samples from the campuses had metal concentrations higher than background levels, especially for Pb, Zn, Co, Cu, Cr, and Ba. The pollution assessment indicated that the campus dusts were not contaminated with As, Mn, Ni, or V, were moderately or not contaminated with Ba and Cr and were moderately to strongly contaminated with Co, Cu, Pb, and Zn. Local Moran's I analysis detected the locations of spatial clusters and outliers and indicated that the pollution with these 10 metals occurred in significant high-high spatial clusters, low-high, or even high-low spatial outliers. As, Cu, Mn, Ni, Pb, V, and Zn had important high-high patterns in the center of Xi'an. The western and southwestern regions of the study area, i.e., areas of old and high-tech industries, have strongly contributed to the Co content in the campus dust.
School of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China. chenhao8848@126.com.
Hao
H
Chen
School of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China. luxinwei@snnu.edu.cn.
Xinwei
X
Lu
School of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China. tianning_gao@sina.com.
Tianning
T
Gao
School of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China. changyuyu@snnu.edu.cn.
Yuyu
Y
Chang
D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities / Q000706:statistics & numerical data; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000032:analysis* / Q000706:statistics & numerical data*; D019216:Metals, Heavy / Q000032:analysis*; D012574:Schools / Q000706:statistics & numerical data; D012989:Soil Pollutants / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission
D000393:Air Pollutants; D004391:Dust; D019216:Metals, Heavy; D012989:Soil Pollutants
Local Moran’s I; dust; hotspot; metals; spatial cluster