Advanced Biomass R&D Center, Korea Advanced Institute of Science and Technology, 291 Daehakno, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Environ Sci Pollut Res Int. 2011 Nov;18(9):1508-17. doi: 10.1007/s11356-011-0515-3. Epub 2011 May 7.
To investigate the influence of biomass burning on the levels of polycyclic aromatic hydrocarbons (PAHs) in soils, temporal trends and profiles of 16 US Environmental Protection Agency priority PAHs were studied in soil and ash samples collected 1, 5, and 9 months after forest fires in South Korea.
The levels of PAHs in the burnt soils 1 month after the forest fires (mean, 1,200 ng/g dry weight) were comparable with those of contaminated urban soils. However, 5 and 9 months after the forest fires, these levels decreased considerably to those of general forest soils (206 and 302 ng/g, respectively). The burnt soils and ash were characterized by higher levels of light PAHs with two to four rings, reflecting direct emissions from biomass burning. Five and 9 months after the forest fires, the presence of naphthalene decreased considerably, which indicates that light PAHs were rapidly volatilized or degraded from the burnt soils.
The temporal trend and pattern of PAHs clearly suggests that soils in the forest-fire region can be contaminated by PAHs directly emitted from biomass burning. However, the fire-affected soils can return to the pre-fire conditions over time through the washout and wind dissipation of the ash with high content of PAHs as well as vaporization or degradation of light PAHs.
为了研究生物质燃烧对多环芳烃（PAHs）在土壤中水平的影响，研究了韩国森林火灾发生后 1、5 和 9 个月采集的土壤和灰分样本中 16 种美国环保署优先 PAHs 的时间趋势和分布情况。
森林火灾发生后 1 个月，燃烧土壤中的 PAHs 水平（平均值为 1200ng/g 干重）与污染城市土壤相当。然而，火灾发生 5 和 9 个月后，这些水平显著下降至普通森林土壤的水平（分别为 206 和 302ng/g）。燃烧土壤和灰分的特点是具有更高水平的双环至四环轻 PAHs，反映了生物质燃烧的直接排放。火灾发生 5 和 9 个月后，萘的含量显著下降，这表明轻 PAHs 从燃烧土壤中迅速挥发或降解。
PAHs 的时间趋势和模式清楚地表明，森林火灾地区的土壤可能会受到生物质燃烧直接排放的 PAHs 污染。然而，随着时间的推移，火区土壤可以通过高 PAHs 含量的灰分的冲洗和风力消散以及轻 PAHs 的蒸发或降解，从受火灾影响的土壤中恢复到火灾前的条件。
