The concentrations of 16 priority polycyclic aromatic hydrocarbons （PAHs） were measured in 23 farmland soil samples and 10 riverine sediment samples from Guiyu, China, and the carcinogenic risks associated with PAHs...The concentrations of 16 priority polycyclic aromatic hydrocarbons （PAHs） were measured in 23 farmland soil samples and 10 riverine sediment samples from Guiyu, China, and the carcinogenic risks associated with PAHs in the samples were evaluated. Guiyu is the largest electronic waste （EW） dismantling area globally, and has been well known for the primitive and crude manner in which EWs are disposed, such as by open burning and roasting. The total PAH concentrations were 56-567 ng/g in the soils and 181-3034 ng/g in the sediments. The Shanglian and Huamei districts were found to be more contaminated with PAHs than the north of Guiyu. The soils were relatively weakly contaminated but the sediments were more contaminated, and sediments in some river sections might cause carcinogenic risks to the groundwater system. The PAHs in the soils were derived from combustion sources, but the PAHs in the sediments were derived from both combustion and petroleum sources.展开更多
To assess the influence of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans（PCDD/Fs） on the environment in the vicinity of municipal solid waste incinerators（MSWIs）, we determined the levels of ...To assess the influence of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans（PCDD/Fs） on the environment in the vicinity of municipal solid waste incinerators（MSWIs）, we determined the levels of PCDD/Fs in air and soil samples collected around a MSWI, which is the largest in China. The International Toxicity Equivalency Quantity（I-TEQ） concentrations of PCDD/Fs in air samples were from 0.0300 to 1.03 pg I-TEQ/m^3（0.445–13.6 pg/m^3）, with an average of 0.237 pg I-TEQ/m^3, while in soil samples they ranged from 0.520 to 3.40 pg I-TEQ/g（2.41–88.7 pg/g） with an average of1.49 pg I-TEQ/g. The concentrations of PCDD/Fs in air and soil samples were comparable to other areas, and Pe CDFs were the dominant contributors, which was different from stack gas homologue patterns. Multivariate statistical analysis showed that PCDD/Fs emission from the MSWI did not directly affect the profiles of PCDD/Fs in air and soils, so that vehicles and unidentified emission sources should be considered. The daily inhalation levels of PCDD/Fs for children（0.0110 to 0.392 pg I-TEQ/（kg·day） and adults（0.00600 to 0.221 pg I-TEQ/（kg·day） near the MSWI were lower than the tolerable daily intake of 1.00 to 4.00 pg WHO-TEQ/（kg·day）, but in winter the values were higher than in summer. These results can be used as basic data for assessing the risk of PCDD/Fs exposure in residents living around this MSWI, and more monitoring programs and studies should be carried out around MSWIs.展开更多
基金financially supported by the National Key Fundamental Research Project (No. 2015CB453101)
文摘The concentrations of 16 priority polycyclic aromatic hydrocarbons （PAHs） were measured in 23 farmland soil samples and 10 riverine sediment samples from Guiyu, China, and the carcinogenic risks associated with PAHs in the samples were evaluated. Guiyu is the largest electronic waste （EW） dismantling area globally, and has been well known for the primitive and crude manner in which EWs are disposed, such as by open burning and roasting. The total PAH concentrations were 56-567 ng/g in the soils and 181-3034 ng/g in the sediments. The Shanglian and Huamei districts were found to be more contaminated with PAHs than the north of Guiyu. The soils were relatively weakly contaminated but the sediments were more contaminated, and sediments in some river sections might cause carcinogenic risks to the groundwater system. The PAHs in the soils were derived from combustion sources, but the PAHs in the sediments were derived from both combustion and petroleum sources.
基金supported by a special grant from the State Environmental Protection Administration, research and public service industry (Grant No. 201309029)
文摘To assess the influence of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans（PCDD/Fs） on the environment in the vicinity of municipal solid waste incinerators（MSWIs）, we determined the levels of PCDD/Fs in air and soil samples collected around a MSWI, which is the largest in China. The International Toxicity Equivalency Quantity（I-TEQ） concentrations of PCDD/Fs in air samples were from 0.0300 to 1.03 pg I-TEQ/m^3（0.445–13.6 pg/m^3）, with an average of 0.237 pg I-TEQ/m^3, while in soil samples they ranged from 0.520 to 3.40 pg I-TEQ/g（2.41–88.7 pg/g） with an average of1.49 pg I-TEQ/g. The concentrations of PCDD/Fs in air and soil samples were comparable to other areas, and Pe CDFs were the dominant contributors, which was different from stack gas homologue patterns. Multivariate statistical analysis showed that PCDD/Fs emission from the MSWI did not directly affect the profiles of PCDD/Fs in air and soils, so that vehicles and unidentified emission sources should be considered. The daily inhalation levels of PCDD/Fs for children（0.0110 to 0.392 pg I-TEQ/（kg·day） and adults（0.00600 to 0.221 pg I-TEQ/（kg·day） near the MSWI were lower than the tolerable daily intake of 1.00 to 4.00 pg WHO-TEQ/（kg·day）, but in winter the values were higher than in summer. These results can be used as basic data for assessing the risk of PCDD/Fs exposure in residents living around this MSWI, and more monitoring programs and studies should be carried out around MSWIs.
