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首页> 外文期刊>Environmental toxicology and chemistry >PARAMETERS AFFECTING THE ADSORPTION OF HEXACHLOROBENZENE TO NATURAL SEDIMENTS
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PARAMETERS AFFECTING THE ADSORPTION OF HEXACHLOROBENZENE TO NATURAL SEDIMENTS

机译：影响六氯苯吸附到天然沉积物中的参数

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摘要

Many of the toxic contaminants introduced into aquatic systems are hydrophobic and, because of this, they are transported with the suspended sediments and eventually incorporated into the bottom sediments. Understanding the dynamics of contaminant sorption to sediments is therefore important in understanding and predicting the transport and fate of contaminants. In the present study, the adsorption and the partitioning of hexachlorobenzene (a hydrophobic organic chemical) to natural sediments from the Detroit River were investigated by means of batch mixing experiments. Experiments were conducted over a long period (2 to 5 months) to reach a steady-state equilibrium and at different sediment concentrations (10, 100, 500, 2,000, and 10,000 mg/L). It was found that the adsorption rate was greatest for small time and decreased to zero as time increased. For all concentrations, a steady-state equilibrium was always attained. Experiments quantitatively demonstrate the time-dependent effects of hexachlorobenzene dissolution, of the flocculation of colloidal matter in the water, and of the flocculation of the suspended sediments. Although a solids concentration effect on the partition coefficient was observed, it is shown to be due to the above processes. From the data, a true equilibrium partition coefficient as well as the approximate times to equilibrium can be determined.
机译：引入水生系统的许多有毒污染物是疏水的，因此，它们与悬浮的沉积物一起运输，并最终掺入了底部沉积物中。因此，了解污染物对沉积物的吸附动力学对于理解和预测污染物的运输和结局非常重要。在本研究中，通过分批混合实验研究了六氯苯（一种疏水性有机化学物质）对底特律河天然沉积物的吸附和分配。进行了长时间（2至5个月）的实验，以达到稳态平衡并处于不同的沉积物浓度（10、100、500、2,000和10,000 mg / L）下。发现吸附速率在短时间内最大，并且随着时间增加而降低至零。对于所有浓度，总是达到稳态平衡。实验定量地证明了六氯苯溶解，水中胶体物质的絮凝以及悬浮沉积物的絮凝随时间的影响。尽管观察到固形物浓度对分配系数的影响，但是这表明是由于上述过程引起的。根据数据，可以确定真实的平衡分配系数以及达到平衡的近似时间。

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