[Objective] This study was conducted to provide a scientific theoretical ba- sis for pollution forewarning and agricultural planning. [Method] 15 PAHs were stud- ied for pollution characteristics, source analysis and ...[Objective] This study was conducted to provide a scientific theoretical ba- sis for pollution forewarning and agricultural planning. [Method] 15 PAHs were stud- ied for pollution characteristics, source analysis and ecological risk assessment at 60 sites in Hohhot farmland. [Result] The results showed that the total contents of 15 PAHs （：EPAHs） in 60 sampling points of Hohhot farmland were in the range of 114-948 ~g/kg, with an average content of 338 pg/kg. According to soil PAH as- sessment standards, more than 70% of soil in Hohhot City was lightly polluted, and there were no heavily-polluted points. The soil of the area was mainly polluted by PAHs with high molecular weights, which accounted for 74% of the total content. The soil in suburban farmland of Hohhot suffered from the heaviest pollution. Quan- titative analysis showed that PAH pollution in Hohhot farmland was mainly from combustion of coal, coke and timber and automotive exhaust emission. [Conclusion] Ecological effect interval method and method of equivalents equivalent to benzo （a） pyrene toxicity benzo [a] pyrene both proved that there is certain potential ecological risk for soil of Hohhot farmland, and PAHs with high molecular weights such as benzo （a） pyrene and dibenzo [a, h] anthracene are main potential pollutants with ecological risk.展开更多
The concentrations of PAHs in the surface waters from seven river basins in China were summarized from literature published from 2000-2010. Subsequently, the risks from individual PAHs and Y. PAHs in the surface water...The concentrations of PAHs in the surface waters from seven river basins in China were summarized from literature published from 2000-2010. Subsequently, the risks from individual PAHs and Y. PAHs in the surface waters of China were quantified by comparing the overlap between the probability distributions of exposure concentrations with the probability distributions of toxicity data. The results show that the concentrations of 15 PAHs in the surface waters ranged from 3.09 to 38139.00 ng L-a, with a geometric mean of 474.93 ng L-1. The significantly higher concentrations of the 15 PAHs occurred in the surface waters from northern China when compared with those from southern China. The concentrations of the 15 PAHs in Chinese surface waters were higher than those in other waters worldwide. The MOSI0 （margin of safety） values were calculated at 90th percen- tile values of exposure concentrations and 10th percentile values of toxicity data, with 5.75, 0.17, 2.33, 0.30, 0.57, 1.74, 1.05, and 0.11 for Ace, Ant, Flu, BaP, Flua, Nap, Phe, and Pyr, respectively. The probabilities of the individual PAH concentrations exceeding the 10th percentile value of the toxicity data were 6.06%, 2.07%, 9.51%, and 2.07% for Nap, Ace, Phe, and Flu, re- spectively, suggesting minimal risk to aquatic organisms; however, the probabilities of BaP, Ant, Flua, and Pyr exceeding this value were 19.49%, 25.46%, 15.15%, and 30.50%, respectively, indicating potential risks. Among the individual PAHs, the ecological risk from Pyr was the highest, followed by, in descending order of risk, Ant, Bap, Flua, Phe, Nap, Flu, and Ace. Additionally, the combined ecological risk of ~ PAH8 in Chinese surface waters was significantly higher than any that of in- dividual PAHs alone. The MOS0 values in the river basins were 〈 1, except for the Haihe River Basin, suggesting a potential combined risk from E PAH8 in the other six fiver basins. The probabilities calculation indicate that low to high ecological risk from E PAH8 for all aquatic species was reported in the Liaohe River Basin （65.58%）, Huaihe River Basin （57.15%）, Songhua River Basin （46.49%）, Pearl River Basin （38.41%）, Yangtze River Basin （25.98%）, Yellow River Basin （15.92%）, and Haihe River Basin （5.22%）.展开更多
基金Supported by Youth Innovation Fund of Inner Mongolia Academy of Agricultural&Animal Husbandry Sciences(2014QNJJN04)Inner Mongolia Science and Technology Planning Project(2014KJ0610)~~
文摘[Objective] This study was conducted to provide a scientific theoretical ba- sis for pollution forewarning and agricultural planning. [Method] 15 PAHs were stud- ied for pollution characteristics, source analysis and ecological risk assessment at 60 sites in Hohhot farmland. [Result] The results showed that the total contents of 15 PAHs （：EPAHs） in 60 sampling points of Hohhot farmland were in the range of 114-948 ~g/kg, with an average content of 338 pg/kg. According to soil PAH as- sessment standards, more than 70% of soil in Hohhot City was lightly polluted, and there were no heavily-polluted points. The soil of the area was mainly polluted by PAHs with high molecular weights, which accounted for 74% of the total content. The soil in suburban farmland of Hohhot suffered from the heaviest pollution. Quan- titative analysis showed that PAH pollution in Hohhot farmland was mainly from combustion of coal, coke and timber and automotive exhaust emission. [Conclusion] Ecological effect interval method and method of equivalents equivalent to benzo （a） pyrene toxicity benzo [a] pyrene both proved that there is certain potential ecological risk for soil of Hohhot farmland, and PAHs with high molecular weights such as benzo （a） pyrene and dibenzo [a, h] anthracene are main potential pollutants with ecological risk.
基金supported by National Basic Research Program of China(Grant No. 2008CB418200)National Natural Science Foundation of China (Grant Nos. U0833603, 41130743)
文摘The concentrations of PAHs in the surface waters from seven river basins in China were summarized from literature published from 2000-2010. Subsequently, the risks from individual PAHs and Y. PAHs in the surface waters of China were quantified by comparing the overlap between the probability distributions of exposure concentrations with the probability distributions of toxicity data. The results show that the concentrations of 15 PAHs in the surface waters ranged from 3.09 to 38139.00 ng L-a, with a geometric mean of 474.93 ng L-1. The significantly higher concentrations of the 15 PAHs occurred in the surface waters from northern China when compared with those from southern China. The concentrations of the 15 PAHs in Chinese surface waters were higher than those in other waters worldwide. The MOSI0 （margin of safety） values were calculated at 90th percen- tile values of exposure concentrations and 10th percentile values of toxicity data, with 5.75, 0.17, 2.33, 0.30, 0.57, 1.74, 1.05, and 0.11 for Ace, Ant, Flu, BaP, Flua, Nap, Phe, and Pyr, respectively. The probabilities of the individual PAH concentrations exceeding the 10th percentile value of the toxicity data were 6.06%, 2.07%, 9.51%, and 2.07% for Nap, Ace, Phe, and Flu, re- spectively, suggesting minimal risk to aquatic organisms; however, the probabilities of BaP, Ant, Flua, and Pyr exceeding this value were 19.49%, 25.46%, 15.15%, and 30.50%, respectively, indicating potential risks. Among the individual PAHs, the ecological risk from Pyr was the highest, followed by, in descending order of risk, Ant, Bap, Flua, Phe, Nap, Flu, and Ace. Additionally, the combined ecological risk of ~ PAH8 in Chinese surface waters was significantly higher than any that of in- dividual PAHs alone. The MOS0 values in the river basins were 〈 1, except for the Haihe River Basin, suggesting a potential combined risk from E PAH8 in the other six fiver basins. The probabilities calculation indicate that low to high ecological risk from E PAH8 for all aquatic species was reported in the Liaohe River Basin （65.58%）, Huaihe River Basin （57.15%）, Songhua River Basin （46.49%）, Pearl River Basin （38.41%）, Yangtze River Basin （25.98%）, Yellow River Basin （15.92%）, and Haihe River Basin （5.22%）.
