Studies of polycyclic aromatic hydrocarbons (PAHs) in the surface soil were conducted in Huizhou City, which is located in the Pearl River Delta, South China. Sixteen PAHs in 42 soil samples were detected. The results...Studies of polycyclic aromatic hydrocarbons (PAHs) in the surface soil were conducted in Huizhou City, which is located in the Pearl River Delta, South China. Sixteen PAHs in 42 soil samples were detected. The results showed that 4 components of PAHs were detectable in all soil samples, and other 12 components were also detect- able to some extent. The total PAHs contents range from 35.40 to 534.5 μg/kg with the mean value of 123.09 μg/kg. Soil in Huizhou was slightly polluted by PAHs according to Maliszewska-Kordybach’s study. It can be confirmed that the increase of PAHs contents in the surface soil of Huizhou City is closely connected to human activities. Mul- tivariate analysis was also made in this study. Principal component analysis was used to constrain their origins, and 3 principal components (PCs) were extracted. The results showed that coal combustion and oil spilling made the major contributions to PAHs. Cluster analysis was made and 16 priority PAHs were classified as 4 sorts, and the result revealed the differences in environmental behavior, chemical properties and sources of PAHs.展开更多
A total of 118 of agricultural soil and 43 of vegetable samples were collected from Dongguan City, Guangdong, China. The spatial distribution, sources, accumulation characteristics and potential risk of heavy metals i...A total of 118 of agricultural soil and 43 of vegetable samples were collected from Dongguan City, Guangdong, China. The spatial distribution, sources, accumulation characteristics and potential risk of heavy metals in the agricultural soils and vegetables were depicted in details by three different approaches, including total contents of eight metal elements in soils and vegetables, GIS maps and multivariate analysis of heavy metals in soils in the study. The results show that there are higher accumulation of heavy metals such as Cu, Zn, Ni, Pb, Cd and Hg in agricultural soils, and the contents of Pb （65.38 mg kg^-1） and Hg （0.24 mg kg^-1） are 1.82 and 2.82 times of the background contents of the corresponding heavy metals in soils of Guangdong Province, respectively. There are about 3.4% of Cu, 5.9% of Ni, 1.7% of Cd and 28% of Hg in all collected soil samples from all investigated sites which have overran the contents for heavy metals of the China Environmental Quality Standard for Soils （GB15618-1995, Grade Ⅱ）. The pollution characteristics of multi-metals in soils are mainly reflected by Hg. There are different sources to eight metal elements in soils, Cu, Zn, Ni Cr and As are predominantly derived from parent materials, and Pb, Hg and Cd are affected by anthropogenic activities. The spatial distribution shows that the Cu, Zn, Ni, Cr, Pb, As and Hg contents of agricultural soils are high in the west and low in the east, and Cd contents are high in the northwest, southeast and low in the southwest in Dongguan. The ratios of vegetable samples which Ni, Pb and As concentrations higher than the Maximum Levels of Contaminants in Foods （GB2762-2005） are 4.7%, 16.3% and 48.8%, respectively. The order of bio-concentration factors （BCF） of heavy metals in vegetables is Cd 〉 Zn 〉 Cu 〉 As 〉 Ni 〉 Hg 〉 Cr 〉 Pb. It is necessary to focus on potential risk of heavy metals for food safety and human＇s health from agricultural soils and vegetables in Dongguan City, Guangdong Province.展开更多
1 Introduction Shalagang mine,the largest antimony deposit in southern Tibet,is located in the west of Longma Town,Jiangzi County,to the east is the anticlinorium of Jiangzibasin.The exposed strata in the mine area ar...1 Introduction Shalagang mine,the largest antimony deposit in southern Tibet,is located in the west of Longma Town,Jiangzi County,to the east is the anticlinorium of Jiangzibasin.The exposed strata in the mine area are the Upper Cretaceous Zongzhuo Formation(a set of sedimentary chaotic melange)and the Lower Cretaceous Duojiu展开更多
基金supported jointly by the Ministry of Land and Resources of China ([2005]011-16)the State Environment Pro-tection Administration of China (2001-1-2)
文摘Studies of polycyclic aromatic hydrocarbons (PAHs) in the surface soil were conducted in Huizhou City, which is located in the Pearl River Delta, South China. Sixteen PAHs in 42 soil samples were detected. The results showed that 4 components of PAHs were detectable in all soil samples, and other 12 components were also detect- able to some extent. The total PAHs contents range from 35.40 to 534.5 μg/kg with the mean value of 123.09 μg/kg. Soil in Huizhou was slightly polluted by PAHs according to Maliszewska-Kordybach’s study. It can be confirmed that the increase of PAHs contents in the surface soil of Huizhou City is closely connected to human activities. Mul- tivariate analysis was also made in this study. Principal component analysis was used to constrain their origins, and 3 principal components (PCs) were extracted. The results showed that coal combustion and oil spilling made the major contributions to PAHs. Cluster analysis was made and 16 priority PAHs were classified as 4 sorts, and the result revealed the differences in environmental behavior, chemical properties and sources of PAHs.
基金Important National Science & Technology Specific Projects of China, No.2007zx07211Fund from the Ministry of Environmental Protection of the People’s Republic of China, No.0202043
文摘A total of 118 of agricultural soil and 43 of vegetable samples were collected from Dongguan City, Guangdong, China. The spatial distribution, sources, accumulation characteristics and potential risk of heavy metals in the agricultural soils and vegetables were depicted in details by three different approaches, including total contents of eight metal elements in soils and vegetables, GIS maps and multivariate analysis of heavy metals in soils in the study. The results show that there are higher accumulation of heavy metals such as Cu, Zn, Ni, Pb, Cd and Hg in agricultural soils, and the contents of Pb （65.38 mg kg^-1） and Hg （0.24 mg kg^-1） are 1.82 and 2.82 times of the background contents of the corresponding heavy metals in soils of Guangdong Province, respectively. There are about 3.4% of Cu, 5.9% of Ni, 1.7% of Cd and 28% of Hg in all collected soil samples from all investigated sites which have overran the contents for heavy metals of the China Environmental Quality Standard for Soils （GB15618-1995, Grade Ⅱ）. The pollution characteristics of multi-metals in soils are mainly reflected by Hg. There are different sources to eight metal elements in soils, Cu, Zn, Ni Cr and As are predominantly derived from parent materials, and Pb, Hg and Cd are affected by anthropogenic activities. The spatial distribution shows that the Cu, Zn, Ni, Cr, Pb, As and Hg contents of agricultural soils are high in the west and low in the east, and Cd contents are high in the northwest, southeast and low in the southwest in Dongguan. The ratios of vegetable samples which Ni, Pb and As concentrations higher than the Maximum Levels of Contaminants in Foods （GB2762-2005） are 4.7%, 16.3% and 48.8%, respectively. The order of bio-concentration factors （BCF） of heavy metals in vegetables is Cd 〉 Zn 〉 Cu 〉 As 〉 Ni 〉 Hg 〉 Cr 〉 Pb. It is necessary to focus on potential risk of heavy metals for food safety and human＇s health from agricultural soils and vegetables in Dongguan City, Guangdong Province.
基金financially supported by the General Program of National Natural Science Foundation of China (No.40573019)the Research Found for the Doctoral Program of Higher Education of China (No.20040558050)
文摘1 Introduction Shalagang mine,the largest antimony deposit in southern Tibet,is located in the west of Longma Town,Jiangzi County,to the east is the anticlinorium of Jiangzibasin.The exposed strata in the mine area are the Upper Cretaceous Zongzhuo Formation(a set of sedimentary chaotic melange)and the Lower Cretaceous Duojiu
