Fe biogeochemistry in reclaimed acid mine drainage precipitates--implications for phytoremediation.
Fe biogeochemistry in reclaimed acid mine drainage precipitates--implications for phytoremediation.
复制标题
DOI：
10.1016/j.envpol.2013.08.033
复制
发表时间：
2014
影响因子：
8.9
通讯作者：
C. Rojas;C. Martínez;M. Bruns
中科院分区：
文献类型：
--
作者：
C. Rojas;C. Martínez;M. Bruns
在美国宾夕法尼亚州中部一个有50年历史的煤矿排水荒地上，我们评估了复垦区酸性铁（III）氧（水合）氧化物沉淀物的生物地球化学，并将其与对照区未经处理的沉淀物进行了比较。回收的地块支持2006年一次性堆肥和石灰处理后形成的连续植被，而对照地块支持生物结壳。在一个脆弱岩田上方有矿井排水侧向地下流的地区，从潮湿但不饱和的表层取样了沉淀物。回收的铁（II）浓度比对照沉淀物高3 ~ 5倍。有机结合铁和无定形铁氧化物，作为总铁的一部分，在回收中也高于对照沉淀。估计铁还原菌和铁氧化菌的根附着比两种类型的对照沉淀高4到10倍。通过扩大试验田的测量，开垦后5年的总铁损失量估计为45吨铁公顷- 1年- 1。
At a 50-year-old coal mine drainage barrens in central Pennsylvania, USA, we evaluated the biogeochemistry of acidic, Fe(III)oxy(hydr)oxide precipitates in reclaimed plots and compared them to untreated precipitates in control areas. Reclaimed plots supported successional vegetation that became established after a one-time compost and lime treatment in 2006, while control plots supported biological crusts. Precipitates were sampled from moist yet unsaturated surface layers in an area with lateral subsurface flow of mine drainage above a fragipan. Fe(II) concentrations were three- to five-fold higher in reclaimed than control precipitates. Organically bound Fe and amorphous iron oxides, as fractions of total Fe, were also higher in reclaimed than control precipitates. Estimates of Fe-reducing and Fe-oxidizing bacteria were four- to tenfold higher in root-adherent than both types of control precipitates. By scaling up measurements from experimental plots, total Fe losses during the 5-yr following reclamation were estimated at 45 t Fe ha−1yr−1.