Zhu Hongbo, Roper J Chadwick, Pfaender Frederic K, Aitken Michael D
Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.
Environ Toxicol Chem. 2008 Apr;27(4):837-44. doi: 10.1897/07-166.1.
Incubation of field-contaminated soil under anaerobic conditions can lead to increased mobilization of polycyclic aromatic hydrocarbons (PAHs) into water. In the present study, we evaluated the effects of anaerobic incubation on the rate and extent of desorption of PAH from two field-contaminated soil samples. One was a highly contaminated soil from a former wood-preserving site that had not been subject to previous treatment; the other was a soil from a former manufactured-gas plant site that had been treated in an aerobic bioreactor. A two-site desorption model was applied to quantify the fast and slowly desorbing fractions of each PAH and the corresponding first-order rate constants for each fraction. For most of the PAHs, the total amount desorbed after 18 d from anaerobically incubated samples was significantly greater than that from their counterparts not subjected to anaerobic incubation, but the overall effect was modest. The rate constant corresponding to the slowly desorbing fraction (k(2)) was much higher for the samples incubated under active anaerobic conditions than that for the controls, implying anaerobic incubation had the greatest influence on the soil compartments controlling the slow release of PAHs. Anaerobic incubation had little to no effect on the rapidly desorbing fraction.
在厌氧条件下对受田间污染的土壤进行培养，会导致多环芳烃（PAHs）向水中的迁移增加。在本研究中，我们评估了厌氧培养对两种受田间污染土壤样品中PAH解吸速率和程度的影响。一种是来自以前木材防腐场地的高度污染土壤，该场地此前未经过处理；另一种是来自以前人造煤气厂场地的土壤，该土壤已在好氧生物反应器中进行过处理。应用双位点解吸模型来量化每种PAH的快速和缓慢解吸组分以及各组分相应的一级速率常数。对于大多数PAHs，厌氧培养18天后从样品中解吸的总量显著大于未进行厌氧培养的对应样品，但总体影响较小。在活跃厌氧条件下培养的样品中，与缓慢解吸组分相对应的速率常数（k(2)）比对照样品高得多，这意味着厌氧培养对控制PAHs缓慢释放的土壤组分影响最大。厌氧培养对快速解吸组分几乎没有影响。
