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首页> 外文期刊>Environmental Science & Technology >Can Chlorofluorocarbon Sorption to Black Carbon (Char) Affect Groundwater Age Determinations?
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Can Chlorofluorocarbon Sorption to Black Carbon (Char) Affect Groundwater Age Determinations?

机译:氯氟碳对黑碳(炭黑)的吸附会影响地下水年龄的确定吗?

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摘要

Although adsorption is not generally considered important in low f_(oc) (fraction organic carbon) aquifers, we show that chlorofluorocarbon (CFC) adsorption to black carbon (BC) is sufficiently large to retard transport and affect groundwater ages obtained with CFCs. Sorption isotherms of CFC-11, -12, and -113 to synthetic wood char were nonlinear (Freundlich n = 0.71-0.94) while humic acid isotherms were linear. Moreover, sorption to char was 10-1000 times greater than to humic acid for all three CFCs at the lowest observed concentrations, C_w/S~ 10~(-8)-10~(-7). We used the observed isotherms for char and humic acid to represent sorption to BC and amorphous organic matter, respectively, in a dual mode model to estimate retardation factors for a low f_(oc) aquifer (= 0.06% gC g~(-1)). The estimated retardation factors for the char-containing aquifer (presumed BC fraction = 9% of f_(oc)) were ~6.8-10.6 at C_w/S = 10~(-8) and >5timesthose estimated assuming amorphous organic matter partitioning only. The results indicate that unless CFC adsorption to BC is evaluated in transport, the groundwater age determined may be biased toward older than true ages. The CFC data archived in BC-containing aquifers may contain information about its adsorbent properties that could be useful to predict retardation of other chlorinated organic contaminants.
机译:尽管在低f_(oc)(有机碳组分)含水层中吸附通常不被认为很重要,但我们表明氯氟烃(CFC)对黑碳(BC)的吸附足够大,足以阻碍运输并影响使用CFC获得的地下水年龄。 CFC-11,-12和-113对合成木炭的吸附等温线是非线性的(Freundlich n = 0.71-0.94),而腐殖酸等温线是线性的。而且,在三种观察到的最低浓度C​​_w / S〜10〜(-8)-10〜(-7)下,所有三种CFC对炭的吸附量均比对腐殖酸的吸附量高10-1000倍。在双模模型中,我们使用观察到的焦炭和腐殖酸的等温线分别表示对BC和无定形有机物的吸附,以估算低f_(oc)含水层(= 0.06%gC g〜(-1))的阻滞因子。 )。在C_w / S = 10〜(-8)时,含碳含水层的估计延迟因子(假定BC比例= f_(oc)的9%)约为6.8-10.6,大于仅假定无定形有机物分配的5倍。结果表明,除非在运输过程中评估了CFC对BC的吸附,否则确定的地下水年龄可能会偏向实际年龄以上。含BC含水层中储存的CFC数据可能包含有关其吸附性能的信息,这些信息可用于预测其他氯化有机污染物的阻滞作用。

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  • 来源
    《Environmental Science & Technology》 |2010年第12期|P.4459-4464|共6页
  • 作者单位

    Department of Geology, 411 Cooke Hall, University at Buffalo, The State University of New York, Buffalo, New York 14260;

    rnDepartment of Geology, 411 Cooke Hall, University at Buffalo, The State University of New York, Buffalo, New York 14260;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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