Comparing black carbon types in sequestering polybrominated diphenyl ethers (PBDEs) in sediments.

Comparing black carbon types in sequestering polybrominated diphenyl ethers (PBDEs) in sediments.
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DOI:
10.1016/j.envpol.2013.08.009
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发表时间:
2014-01
影响因子:
8.9
通讯作者:
Gan, Jay
Gan, Jay
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Jia, Fang;Gan, Jay

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多溴二苯醚广泛存在于沉积物中,特别是五溴二苯醚的同系物。由于多溴联苯醚与黑碳(BC)的亲和力很强,在BC改良的沉积物中,多溴联苯醚的生物利用度可能会降低。在这项研究中,我们使用了矩阵SPME方法来测量自由溶解的浓度(Cfree)的PBDEs作为其潜在的生物利用度的参数,并评估生物炭,木炭和活性炭之间的差异。活性炭显示出比生物炭或木炭大得多的螯合能力。在有机碳含量较低(0.12%)的沉积物中,生物炭、木炭和活性炭对6种PBDEs的游离碳的去除率分别为47.5- 78.0%、47.3- 77.5%和94.1-98.3%,而在有机碳含量较高(0.87%)的沉积物中,其固定效果较为有限。因此,在基于BC的补救或缓解中,重要的是要考虑BC和沉积物的类型和性质。
Polybrominated diphenyl ethers (PBDEs) are widely found in sediments, especially congeners from the penta-BDE formula. Due to their strong affinity for black carbon (BC), bioavailability of PBDEs may be decreased in BC-amended sediments. In this study, we used a matrix-SPME method to measure the freely dissolved concentration (Cfree) of PBDEs as a parameter of their potential bioavailability and evaluated the differences among biochar, charcoal, and activated carbon. Activated carbon displayed a substantially greater sequestration capacity than biochar or charcoal. At 1% amendment rate in sediment with low organic carbon (OC) content (0.12%), Cfree of six PBDEs was reduced by 47.5–78.0%, 47.3–77.5%, and 94.1–98.3% with biochar, charcoal, and activated carbon, respectively, while the sequestration was more limited in sediment with high OC content (0.87%). Therefore, it is important to consider the type and properties of the BC and the sediment in BC-based remediation or mitigation.
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