有機物於改良土壤有機質中傳輸宿命之研究

Study the Organic Contaminants Transport on Modifiedclay with Dyes and Surfactant

黃富昌(Fu-Chang Huang) ； 徐家駿(Jia-Jiun Shiu)

《南亞學報》 30期 (2010/12) Pp. 171-183

https://doi.org/10.6989/JN.201012.0171

摘要

水飽和的土壤中，土壤無機質的吸附被大量的水所抑制，因此非離子有機污染物的吸附主要為有機質的分佈作用（Partition），其吸附等溫線呈現線性。近期不少文獻中指出，非離子有機污染物在極低濃度時，土壤對其呈現非線性的吸附作用；存在其他共同吸附質時，這種非線性吸附作用會被抑制。造成這種現象的原因可能與土壤有機質中存在一些特殊組成有關，進而推測土壤有機質對非離子有機污染物的作用機制應不只一種。本研究以含有大量苯環結構且容易掌握物化特性的染料作為土壤有機質的唯一來源，探討苯環結構間所產生之分子作用力對土壤－水系統中非離子有機化合物傳輸行為之影響。以製備有機質改良土作為化合物之分佈介質，對於相同NOC而言，分佈於組成相同但含量不同的土壤有機質之有機碳分佈係數為一常數；不過當有機碳含量低於其作為分佈介質的極限時，非離子有機化合物的有機碳分佈係數會明顯的偏高。

關鍵字

吸附 ； 分佈 ； 土壤有機質 ； 非離子有機污染物

並列摘要

The effects of soil structure and chemical properties on the adsorption/desorption of volatile organic compounds were evaluated. The migration and the fates of nonionic organic compounds in soils are found to be highly depended on their vapor-phase sorptive behavior. In aqueous solution, the sorption of nonionic organic compounds (NOCs) on soil occurs mainly by partition into the soil organic matter because the adsorption on soil mineral fraction is strongly suppressed by water. Recently, many researchers have been speculated that the sorption of NOCs on some soils displays a nonlinear sorption isotherm at relatively low concentration. The nonlinear uptake of a solute by soils at low NOCs concentration may be suppressed by other solutes in multiple-solute systems. These observations indicate that more than one mechanism are required to account for the sorption of SOM. This study is to investigate the effects of benzene rings interaction on the transport of nonionic organic contaminants in the soil/water system.Dyes with varied structures were used to consist of soil organic matter that is regarded as the partition medium. The Koc values of an individual NOC remain a constant for the clays with same organic component.

並列關鍵字

adsorption ； partition ； soil organic matter (SOM) ； nonionic organic compounds (NOCs)