Limited Effectiveness of Carbonaceous Sorbents in Sequestering Aged Organic Contaminants in Sediments.
Limited Effectiveness of Carbonaceous Sorbents in Sequestering Aged Organic Contaminants in Sediments.
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DOI：
10.1021/acs.est.3c02309
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发表时间：
2023-06-27
影响因子：
11.4
通讯作者：
Gan, Jay
中科院分区：
文献类型：
--
作者：
Taylor, Allison R.;Wang, Jie;Kaur, Parminder;Schlenk, Daniel;Gan, Jay
碳质材料通常被提议用于修复被疏水有机污染物（HOC）污染的土壤或沉积物。然而，大多数场址的污染是历史事件的结果，在这些场址，有毒有机物在固体隔室中存在多年或数十年。延长的接触时间或老化导致污染物可用性降低，并可能降低使用吸附剂的有效性。在这项研究中，三种不同的碳质吸附剂，即，生物炭、粉末活性炭和颗粒活性炭，被修正为几十年前被DDT残留物污染的超级基金场地海洋沉积物。修正后的沉积物在海水中孵育长达1年，自由溶解浓度（Cfree）和生物群沉积物积累因子（BSAFs）的本地多毛类动物（Neanthes arenaceodentata）进行了测量。尽管整体沉积物浓度很高（6.4-154.9微克/克有机碳），但游离碳和生物安全系数都很小，分别在nd至1.34纳克/升和nd至0.024之间。添加含碳吸附剂，即使在2%（重量/重量），并没有一贯导致减少滴滴涕的生物积累。含碳吸附剂的有效性有限，这是由于长期老化导致滴滴涕的可用性低，这突出表明在使用吸附剂进行补救时需要考虑污染物的老化。含碳吸附剂对含老化污染物的土壤和沉积物场地的修复效果有限。
Carbonaceous materials are often proposed for use in restoring soils or sediments contaminated with hydrophobic organic contaminants (HOCs). However, the contamination of most sites is a result of historical events, where HOCs have resided in the solid compartment for many years or decades. The prolonged contact time, or aging, leads to reduced contaminant availability and likely diminished effectiveness of using sorbents. In this study, three different carbonaceous sorbents, i.e., biochars, powdered activated carbon, and granular activated carbon, were amended to a Superfund site marine sediment contaminated with DDT residues from decades ago. The amended sediments were incubated in seawater for up to 1 year, and the freely dissolved concentration (Cfree) and the biota-sediment accumulation factors (BSAFs) for a native polychaete (Neanthes arenaceodentata) were measured. Even though the bulk sediment concentrations were very high (6.4–154.9 μg/g OC), both Cfree and BSAFs were very small, ranging from nd to 1.34 ng/L and from nd to 0.024, respectively. The addition of carbonaceous sorbents, even at 2% (w/w), did not consistently lead to reduced DDT bioaccumulation. The limited effectiveness of carbonaceous sorbents was attributed to the low DDT availability due to prolonged aging, highlighting the need for considering contaminant aging when using sorbents for remediation. Carbonaceous sorbents have limited effectiveness for remediation of soil and sediment sites with aged contaminants.
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影响因子：
3.7
作者：
Gregory SJ;Anderson CW;Camps-Arbestain M;Biggs PJ;Ganley AR;O'Sullivan JM;McManus MT
通讯作者：
McManus MT
影响因子：
11.4
作者：
Eganhouse, Robert P.;Pontolillo, James
通讯作者：
Pontolillo, James
影响因子：
4.1
作者：
Ahmad, R;Kookana, RS;Alston, AM
通讯作者：
Alston, AM
影响因子：
4.1
作者：
Anderson, BS;Hunt, JW;Tjeerdema, RS
通讯作者：
Tjeerdema, RS
影响因子：
9.8
作者：
Bettinetti, R.;Quadroni, S.;Galassi, S.
通讯作者：
Galassi, S.