Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark.
Environ Pollut. 2013 Oct;181:200-10. doi: 10.1016/j.envpol.2013.06.026. Epub 2013 Jul 16.
Sorption of PAHs to carbonaceous soil amendments reduces their dissolved concentrations, limiting toxicity but also potentially biodegradation. Therefore, the maximum abiotic desorption of freshly sorbed phenanthrene (≤5 mg kg(-1)) was measured in three soils amended with activated carbon (AC), biochar or compost. Total amounts of phenanthrene desorbed were similar between the different soils, but the amendment type had a large influence. Complete desorption was observed in the unamended and compost amended soils, but this reduced for biochar (41% desorbed) and AC (8% desorbed). Cumulative amounts mineralized were 28% for the unamended control, 19% for compost, 13% for biochar and 4% for AC. Therefore, the effects of the amendments in soil in reducing desorption were also reflected in the extents of mineralization. Modeling was used to analyze key processes, indicating that for the AC and charcoal treatments bacterial activity did not limit mineralization, but rather desorption into the dissolved phase.
土壤添加碳质改良剂会吸附多环芳烃，降低其溶解浓度，从而限制其毒性，但也可能会抑制其生物降解。因此，在三种添加了活性炭（AC）、生物炭或堆肥的土壤中，测量了刚吸附的菲（≤5 mg kg(-1))的最大非生物解吸量。不同土壤之间解吸的菲总量相似，但改良剂类型有很大影响。未添加和添加堆肥的土壤中观察到完全解吸，但生物炭（解吸 41%）和 AC（解吸 8%）的解吸减少。未添加对照的累积矿化量为 28%，堆肥为 19%，生物炭为 13%，AC 为 4%。因此，改良剂在土壤中降低解吸的效果也反映在矿化程度上。模型分析表明，对于 AC 和木炭处理，细菌活性不会限制矿化，而是会将其解吸到溶解相中。
