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首页> 外文会议>International Conference on Wetlands amp; Remediation Salt Lake City, Utah, November 16-17, 1999 >Desorption Resistance of organic compounds in wetland soils
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Desorption Resistance of organic compounds in wetland soils

机译：有机化合物在湿地土壤中的解吸性

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摘要

Reversible sorption of organic compounds in soils and sediments is a common assumption in assessing risk and determining remedial endpoints. However, the presence of a desorption-resistance phase has been widely reported in the literature. Recent work has suggested that the quality of organic matter is important in the magnitude of the desorption-resistant effect. For example, a series of wetland peats demonstrated little or no desorption resistance for phenanthrene (Huang and Weber, 1997). The goal of the present study was to determine if desorption-resistance is observedin recent deposited organic matter by studying wetland soils explicitly. Sorption/desorption characteristics for both surface marsh soil (top 0-2 cm, <5 years old) and deeper marsh soil (below 10-cm, >20 years old) were investigated to see whether soil age can cause differences in sorption/desorption in wetlands. Sorption-desorption of organic compounds (chlorobenzene and phenanthrene) in recently deposited freshwater marsh soils was determined using the batch desorption procedure of Kan et al. (1998). Adsorption was biphasic with about 30-62percent (chlorobenzene) and 46.7-82.9percent (phenanthrene) of the adsorbed mass residing in the desorption-resistant fraction after 7-14 desorption steps. Sorption/desorption parameters were determined for several of the currently proposed models for explaining the desorption resistance including the Tomson-Kan model, slow sorption model and dual reactive domain model (DRDM). All models indicated the presence of a sizeable desorption-resistant phase in wetland soils and an increase in the size of the desorption-resistance in "older" organic matter. Implications for wetland remediation are discussed.
机译：土壤和沉积物中有机化合物的可逆吸附是评估风险和确定补救终点的常见假设。然而，在文献中已经广泛报道了抗解吸相的存在。最近的工作表明，有机物的质量对于抗脱附效果的大小很重要。例如，一系列湿地泥炭对菲的吸附性能几乎没有或没有（Huang和Weber，1997）。本研究的目的是通过明确研究湿地土壤来确定在最近沉积的有机物中是否观察到了抗吸附性。研究了表层沼泽土壤（顶部0-2 cm，<5岁）和深层沼泽土壤（10 cm以下，> 20岁）的吸附/解吸特性，以查看土壤年龄是否会引起吸附/解吸差异在湿地。使用Kan等人的分批解吸程序确定了最近沉积的淡水沼泽土壤中有机化合物（氯苯和菲）的吸附-解吸。 （1998）。吸附是两相的，在7-14个解吸步骤后，约30-62％（氯苯）和46.7-82.9％（菲）的吸附物质存在于抗吸附组分中。确定了几种当前提出的用于解释解吸阻力的模型的吸附/解吸参数，包括Tomson-Kan模型，慢速吸附模型和双反应域模型（DRDM）。所有模型都表明，在湿地土壤中存在相当大的抗解吸相，“较旧”有机物中的抗脱附量也有所增加。讨论了对湿地修复的影响。

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