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Gao Y.,University of Science and Technology Beijing | Guo X.,University of Science and Technology Beijing | Ji H.,University of Science and Technology Beijing | Ji H.,Chinese Academy of science | And 6 more authors.
Atmospheric Research | Year: 2016

Beijing, as the capital of China, is one of the most populous cities in the world. With the fine particulate matter pollution being increasingly serious, daily exposure to hazardous ingredients caused more and more attention. Current research concerning risk evaluation in Beijing was relative less. In November, 2013, samples were collected in seven different functional areas of Beijing, so as to better understand the risk to human health caused by particle matter pollution in this region. PM2.5 pollution in rural and urban Beijing was relative high under haze-fog days in comparison with non haze-fog value. Zn and Ba showed the highest concentration levels among non-carcinogenic metals. The non-carcinogenic metal concentration at all the sites ranged in the same order: Ce, Pb, Cu, V and Sb. Higher ring PAHs (with four to six rings) were the dominant species and constituted more than 90% of the σ14PAHs. Pb (4.34 × 10-4 for men, 3.73 × 10-4 for women) presented the maximum risk level for non-carcinogenic heavy metals in the whole study area. While, risk levels of Cr at residential areas, schools, Olympic Park and rural countryside exceeded the limit for adults. In haze-fog days, the carcinogenic PAH risk level in each functional area ranged in the order: rural countryside > inner suburban district > Olympic Park > city central > schools > ecological reserve > residential areas. To some extent, benzo(a)pyrene may had a potential risk to adults, and other carcinogenic PAHs were all under average risk acceptance. © 2016 Elsevier B.V. Source


Huang X.-X.,University of Science and Technology Beijing | Zhu X.-F.,Capital Normal University | Tang L.,Beijing Geo engineering Design and Research Institute | Ji H.-B.,University of Science and Technology Beijing | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

The distribution characteristics and potential ecological risk of heavy metals in a iron mine soil of the upstream area of Miyun Reservoir, Beijing were investigated by the enrichment factor and risk assessment code (RAC). The results showed that, the metal concentrations in the iron mine soil samples exceeded the background levels in Beijing, with As, as an exceptions; the ore dressing and smelting activities in this iron mine had definitely impacted the downstream water and the soil environment. The enrichment factor suggested that the enrichment of Cd, Pb, and Cr were very serious, which posed a remarkable pollution level. Furthermore, the analysis of chemical speciation indicated that heavy metals appeared mainly associated with the residual fraction in the soil, and the exchangeable fractions of Cd was the highest (2.88%~21.15%) among these elements. The RAC showed that Cd posed a medium ecological risk, whereas Pb posed no risk. The degrees of ecological risk descended in the order Cd>Mn>Zn>Cu>Co>Cr>Pb. Source


Zhu X.,Capital Normal University | Tang L.,Beijing Geo engineering Design and Research Institute | Ji H.,Capital Normal University | Ji H.,Chinese Academy of science | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010

Contents and sources of heavy metals (As, Hg, Cd, Cr, Cu, Mn, Ni, Pb, Ti and Zn) in the sediments of northern Beijing were researched in this article. We collected 17 samples from the basin of the Chao River, Bai River and Miyun Reservoir and 5 samples were from Wenyu River. Contents of As and Hg in the sediments were analyzed by AAS. Cd, Cr, Cu, Mn, Ni, Pb, Ti and Zn were analyzed by ICP-OES. The results showed that the heavy metals were not obviously enriched in sediments, whereas the enrichment of Hg, Cd, Cr and Zn were relatively high in some sediments. Correlation analysis indicated that significant correlations existed among Hg, Cd, Cr and Zn (r > 0.06; p < 0.01), however, Hg had no significant correlations with Cr, Mn, Ni, Pb and Ti. Principal component analysis was applied to estimate the sources of heavy metals. Results showed that the first three components accounted for 38%, 23% and 17% of the total variance. The first principal components included Hg, Cd, Zn and Cu, which were considered to come from developed industry and mining. The second principal components included As and Mn, which are likely from agricultural contamination and sewage. The third principal components included Cr, Ni and Ti, which were considered to come from rock weathering and soil erosion. Source


Huang X.,University of Science and Technology Beijing | Zhu X.,Capital Normal University | Tang L.,Beijing Geo engineering Design and Research Institute | Ji H.,University of Science and Technology Beijing | Ji H.,Capital Normal University
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012

The distribution and cumulative characteristics of heavy metals in different mines and surrounding soil caused by ore dressing and smelting activities were different. In order to investigate the geochemical characteristics and pollution status of heavy metals in the upstream areas of Miyun Reservoir, the soil samples from typical gold and iron mines were analyzed by the geochemical method and the Geoaccumulation Index was used to evaluate the pollution status of heavy metals. The results showed that, the metal concentrations in the Gold and Iron mine soil samples exceeded the background levels in Beijing except for As, and the content of heavy metal in gold mine soil was higher than that of iron mine soil. Moreover, correlation analysis indicated that significant correlations existed among Pb, Zn(p<0.01), Cr, OM(p<0.05) and Cu, while significant negative correlations existed among Pb(p<0.01), Hg(p<0.05) and pH in gold mine soil. There were no significant correlations among metals in iron mine soil. In addition, heavy metals in gold mine tailings were significantly higher than those in iron ore tailings, which was consistent with the soil pollution status in mines. The Geoaccumulation Index suggested that heavy metals in both soil samples were very serious and the pollution degree of gold mine was higher than that of iron mine. The pollution degrees of gold mine soil samples was ordered as Pb>Hg>Cd>Cr>Cu>Zn>Co>As, while Pb>Cd>Cr>Co>Cu>Zn>Hg>As for iron mine soil samples. The results can provide scientific basis for the effective monitoring and management of heavy metal pollution in different metal mines within this region. Source


Qin F.,University of Science and Technology Beijing | Li Q.,University of Science and Technology Beijing | Ji H.,University of Science and Technology Beijing | Ji H.,Capital Normal University | And 2 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2014

This paper researched and evaluated geochemical characteristics and granularity effect of Rare Earth elements in the bulk and size graded soils from iron ore areas along the Chao River. The concentrations of 15 REEs, i.e. La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y were evaluated by inductively coupled plasma mass spectrometry (ICP-MS). The result showed that the metal concentrations in soil samples, whose mean values changed obviously, exceed those of background levels in mainland China. The trend of the relationship between the concentrations of REEs and size grade was consistent, namely, the concentration of REEs increased with decrease of particle size. With standardization of the soils by six Leedy chondrite average of Masuda (1973), the distribution patterns of REEs was consistent, being the right dip type of light rare earth enrichment, Eu negative anomaly obviously, Ce slight loss, which is mainly controlled by the terrigenous. The change characteristics of REE were closely related to the adsorption of clay minerals and mineral composition of size grade. This conclusion provides a scientific basis for rare earth elements being selected as tracers. It also provides reference for the further study of REEs in various particle size fractions internationally. Source

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