Speciation, sources, and risk assessment of heavy metals in suburban vegetable garden soil in Xianyang City, Northwest China
Speciation, sources, and risk assessment of heavy metals in suburban vegetable garden soil in Xianyang City, Northwest China作者机构：Department of Environmental Science College of Tourism and Environment Shaanxi Normal University Xi'an 710119 China College of Environmental Science and Forestry State University of New York NY 13201 USA
出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)
年 卷 期：2018年第12卷第2期
页 面：397-407页
核心收录：
学科分类：07[理学] 0708[理学-地球物理学] 0704[理学-天文学]
基 金：National Natural Science Foundation of China, NSFC, (41271510, 41471420) Natural Science Foundation of Shaanxi Province, (2014JM5208) Fundamental Research Funds for Central Universities of the Central South University, (GK201601009, GK201701010)
主 题：heavy metal speciation source pollution level ecological risk vegetable garden soil
摘 要：Intensive anthropogenic activities can lead to soil heavy metal contamination resulting in potential risks to the environment and to human health. To reveal the concentrations, speciation, sources, pollution level, and ecological risk of heavy metals in vegetable garden soil, a total of 136 soil samples were collected from three vegetable production fields in the suburbs of Xianyang City, Northwest China. These samples were analyzed by inductively coupled plasma- atomic emission spectrometry and atomic fluorescence spectrometry. The results showed that the mean concentrations of Cd, Co, Cu, Mn, Pb, Zn, and Hg in vegetable garden soil were higher than the corresponding soil element background values of Shaanxi Province. The heavy metals studied in vegetable garden soil were primarily found in the residual fraction, averaging from 31.26% (Pb) to 90.23% (Cr). Considering the non-residual fractions, the mobility or potential risk was in the order of Pb (68.74%)Co (60.54%)Mn (59.28%) Cd (53.54%) ≫Ni (23.36%) Zn (22.73%)Cu (14.93%)V (11.81%)Cr (9.78%). Cr, Mn, Ni, V, and As in the studied soil were related to soilforming parent materials, while Cu, Hg, Zn, Cd, Co, and Pb were associated with the application of plastic films, fertilizers, and pesticides, as well as traffic emissions and industrial fumes. Cr, Ni, V, and As presented low contamination levels, whereas Co, Cu, Mn, Pb, and Zn levels were moderate, and Cd and Hg were high. Ecological risk was low for Co, Cr, Cu, Mn, Pb, Zn, and As, with high risk observed for Cd and Hg. The overall pollution level and ecological risk of these heavy metals were high.
维普期刊数据库