Institute for Combustion Science and Environmental Technology, Western Kentucky University, 2413 Nashville Rd, Bowling Green, Kentucky 42101, USA.
J Environ Sci (China). 2013 Sep 1;25(9):1858-64. doi: 10.1016/s1001-0742(12)60265-4.
The mercury flux in soils was investigated, which were amended by gypsums from flue gas desulphurization (FGD) units of coal-fired power plants. Studies have been carried out in confined greenhouses using FGD gypsum treated soils. Major research focus is uptakes of mercury by plants, and emission of mercury into the atmosphere under varying application rates of FGD gypsum, simulating rainfall irrigations, soils, and plants types. Higher FGD gypsum application rates generally led to higher mercury concentrations in the soils, the increased mercury emissions into the atmosphere, and the increased mercury contents in plants (especially in roots and leaves). Soil properties and plant species can play important roles in mercury transports. Some plants, such as tall fescue, were able to prevent mercury from atmospheric emission and infiltration in the soil. Mercury concentration in the stem of plants was found to be increased and then leveled off upon increasing FGD gypsum application. However, mercury in roots and leaves was generally increased upon increasing FGD gypsum application rates. Some mercury was likely absorbed by leaves of plants from emitted mercury in the atmosphere.
研究了燃煤电厂烟气脱硫（FGD）石膏改良土壤中的汞通量。使用经 FGD 石膏处理的土壤在密闭温室中进行了研究。主要研究重点是植物对汞的吸收，以及在不同 FGD 石膏施用量下、模拟降雨灌溉、土壤和植物类型下汞向大气中的排放。较高的 FGD 石膏施用量通常会导致土壤中汞浓度升高，向大气中排放的汞增加，以及植物（尤其是根和叶）中的汞含量增加。土壤性质和植物种类在汞迁移中起着重要作用。一些植物，如高羊茅，能够防止汞从大气排放到土壤中。随着 FGD 石膏施用量的增加，发现植物茎中的汞浓度增加，然后趋于稳定。然而，随着 FGD 石膏施用量的增加，根和叶中的汞通常会增加。一些汞可能是从大气中排放的汞被植物叶片吸收的。
