In situ phytoextraction of polychlorinated biphenyl -: (PCB) contaminated soil
In situ phytoextraction of polychlorinated biphenyl -: (PCB) contaminated soil
复制标题
DOI：
10.1016/j.scitotenv.2006.11.052
复制
发表时间：
2007-03-01
影响因子：
9.8
通讯作者：
Reimer, Kenneth J.
中科院分区：
文献类型：
--
作者：
Aslund, Melissa L. Whitfield;Zeeb, Barbara A.;Reimer, Kenneth J.
一个中试规模的现场试验的多氯联苯的植物提取提供了深入了解这一技术的实际应用，使用的植物品种西葫芦ssp西葫芦品种。豪登（南瓜）、苔草（莎草）和高羊茅（高羊茅）。这项现场试验是在一个历史上受污染的场地进行的，土壤中的多氯联苯总平均浓度为46微克/克（范围为0.6-200微克/克）（多氯联苯1254/1260）。芦苇中的芽生物累积系数（其中BAF（芽）= [PCBshoot]/[PCBsoil）高达0.29。南瓜植株产生的芽生物累积系数仅为0.15。然而，多氯联苯的浓度在南瓜苗下降的距离以上的根增加，这表明更高的整体南瓜苗生物累积系数可能会实现在较短的，更密集的种植植物。提出了一个模型，估计总体PCB浓度在大南瓜苗与最小采样。同源物数据的检验支持了C. pepo ssp pepo植物具有独特的生物吸收机制，可在植物枝条中积累大量的多氯联苯。尽管该机制尚未得到充分理解，但共洗脱fuPAC同系物43/95和105/127似乎优先被动员。目前，这三种植物都表现出作为多氯联苯植物提取剂的潜力，但还需要进一步的研究来阐明优化这一技术的方法。(c)2006 Elsevier B. V.保留所有权利。
A pilot-scale field trial of phytoextraction of PCBs provides insight into the practical application of this technology, using the plant species Cucurbita pepo ssp pepo cv. Howden (pumpkin), Carex nornialis (sedge), and Festuca arundinacea (tall fescue). This in situ trial took place at a historically contaminated field site, in soil contaminated with a mean concentration of 46 Rg/g (range of 0.6-200 mu g/g) total PCBs (Aroclor 1254/1260). Shoot bioaccumulation factors (where BAF(shoot) = [PCBshoot]/[PCBsoil) of up to 0.29 were achieved in sedge. Pumpkin plants produced shoot BAFs of only 0.15. However, PCB concentrations in pumpkin shoots decreased as the distance above the root increased, suggesting that higher overall pumpkin shoot BAFs might be achieved in shorter, more densely planted plants. A model for estimating the overall PCB concentration in large pumpkin shoots with minimal sampling is proposed. Examination of congener data supports the hypothesis that C. pepo ssp pepo plants exhibit a unique biological uptake mechanism that allows for the accumulation of a significant concentration of PCBs in plant shoots. Although this mechanism is not well understood, the co-eluting fuPAC congeners 43/95 and 105/127 appear to be preferentially mobilized. Presently, all three plant species exhibit potential as PCB phytoextractors, however further research is required to elucidate methods for optimizing this technology. (c) 2006 Elsevier B.V. All rights reserved.