Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic a...Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic aromatic hydrocarbons(PAHs), which are priority pollutants in soils contaminated by oily sludge. The influence of different doses of oily sludge on the dissipation of PAHs was studied along with individual PAH profiles in soils after different periods of plant growth. Five soil samples were artificially contaminated with different percentages of oily sludge(0 %, 5 %, 10 %, 15 % and 20 %). Winter wheat grew in the oily sludge–amended soils for 265 days.PAH content in the soils was monitored over the course of the study. The rate of PAH dissipation is related to the properties of different PAHs, period of winter wheat growth, and oily sludge application dose. Analysis for treated soils indicates that the dissipation of PAHs increased significantly over the first 212 days, followed by minimal changes over the final 53 days of treatment. In contrast, PAH dissipation slowed with increasing oily sludge application. For each PAH, the experimental results showed a significant compound-dependent trend. Winter wheat in the present study significantly enhanced the dissipation of PAHs in oily sludge–contaminated soil.展开更多
[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
基金jointly supported by National Natural Science Foundation of China(41541025)Open Research Fund Program of Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University)(2015KFJJ01)
文摘Oil fields present a potential ecological risk to nearby farmland soil. Here we present a new method designed to evaluate the ability of winter wheat(Triticum aestivum) to contribute to the dissipation of polycyclic aromatic hydrocarbons(PAHs), which are priority pollutants in soils contaminated by oily sludge. The influence of different doses of oily sludge on the dissipation of PAHs was studied along with individual PAH profiles in soils after different periods of plant growth. Five soil samples were artificially contaminated with different percentages of oily sludge(0 %, 5 %, 10 %, 15 % and 20 %). Winter wheat grew in the oily sludge–amended soils for 265 days.PAH content in the soils was monitored over the course of the study. The rate of PAH dissipation is related to the properties of different PAHs, period of winter wheat growth, and oily sludge application dose. Analysis for treated soils indicates that the dissipation of PAHs increased significantly over the first 212 days, followed by minimal changes over the final 53 days of treatment. In contrast, PAH dissipation slowed with increasing oily sludge application. For each PAH, the experimental results showed a significant compound-dependent trend. Winter wheat in the present study significantly enhanced the dissipation of PAHs in oily sludge–contaminated soil.
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.
