土壤中有機污染物濃度與實際污染強度關聯性調查計畫(1/2)
| 中文摘要 | 瞭解污染物在不同介質的平衡分佈與作用機制，可以推估污染物在地下環境的宿命行為，進一步篩選出合適的整治技術，加速整治工作的進行。土壤是礦物質與土壤有機質所組合成的雙重作用體，有機物對礦物質之作用是表面的吸附作用，呈現非直線型的等溫吸附線；土壤有機質則是類似溶解機制的分配作用，產生直線型的等溫吸持線。在水溶液系統中，礦物質表面會優先被水分子所佔據，導致有機物對土壤的作用力主要是以分配到土壤有機質為主。在氣相系統中 (通氣層)，有機物對土壤的作用力會隨著相對濕度的變化而改變。對乾燥的土壤而言，礦物質表面的吸附為主要作用力；潮濕土壤則主要是分配到土壤有機質的作用，其比例會隨著相對濕度而有所不同。有機物在整體土壤的濃度會和土壤有機質含量 (fom) 及污染物無因次分配係數 (Kom) 有關。基於潮濕土壤對有機物主要是分配作用，提出有效土壤污染濃度觀念，有機物在整體土壤的濃度與土壤有機質含量 (fom) 和污染物無因次分配係數 (Kom) 有關。考量到植作對於非離子態有機物的吸收攝取幾乎皆靠被動運輸的方式進行，以分配為主的植作根部吸收模式可依此建構，以做為有機污染物於土壤-植作間傳輸與累積的預測工具。利用根系作物蘿蔔以及持久性有機污染物十溴二苯醚與六氯苯進行的土壤植栽試驗，初步結果顯示與有效土壤污染濃度預測的趨勢一致，且此趨勢也多少從固相微萃取之結果反映。 | ||
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| 中文關鍵字 | 植栽試驗、多溴二苯醚、固相微萃取 | ||
基本資訊
| 專案計畫編號 | EPA-104-1604-02-04 | 經費年度 | 104 | 計畫經費 | 1940 千元 |
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| 專案開始日期 | 2015/03/27 | 專案結束日期 | 2015/12/31 | 專案主持人 | 林居慶 |
| 主辦單位 | 環檢所 | 承辦人 | 陳元武 | 執行單位 | 中央大學環境工程研究所 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
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| 期末報告 | 土壤中有機污染物濃度與實際污染強度關聯性調查計畫(I)_期末報告.pdf | 9MB |
Probing the correlation between the organic contamination level in soils and the actual contaminatio
| 英文摘要 | Concentrations of organic contaminants in common productive soils based on the total soil mass give a misleading account of actual contamination effects. This is attributed to the fact that productive soils are essentially water-saturated, with the result that the soil uptake of organic compounds occurs principally by partition into the soil organic matter (SOM). The soil contamination intensity of a compound is governed by the concentration in the SOM (Com), i.e., the effective contamination level, rather than by the concentration in whole soil (Cs). This SOM-based index is considered timely needed for a evaluating the contamination effects of food crops grown in different soils and for establishing a dependable priority ranking for intended remediation of numerous contamination sites. Given that the uptake of organic matter by plants is considered to occur by passive transport, a partition-limited plant uptake model can be formulated on the basis of the contaminant passive uptake as a series of local partition processes between various plant organic compartments and water (including soil porewater). This model can satisfactorily account for the crop contamination data published in several studies. Pot experiments were conducted this year by cultivating radishes and carrots into soil containing different organic matter in which differential concentrations of PBDEs and HCB were spiked. In addition, SPME experiments were carried out in HCB-spiked soils. Results obtained from both pot and SPME experiments somehow agreed with the trend predicted by the partition theory. | ||
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