EPA-105-1604-02-02

105

1,900 千元

2016/03/25

2016/12/31

林居慶

環檢所

陳元武

國立中央大學環境工程研究所

土壤及地下水

疏水性有機污染物、植栽試驗、固相微萃取

Hydrophobic organic contaminants, pot experiments, SPME

邱成財；洪瑋濃

黃敬慈

03-4227151#34654

ydnas0218@yahoo.com.tw

瞭解污染物在不同環境介質的傳輸與分佈機制，可用以推估污染物在環境的宿命，並進一步篩選出合適的整治技術，以加速整治工作的進行。土壤是礦物質與有機質所組合成的雙重作用體，礦物質對有機物之作用是表面的吸附作用，呈現非直線型的等溫吸附線；對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，故乾燥土將以礦物質表面的吸附為主要作用力，而潮濕土則是以分配到土壤的有機質為主要作用，其比例會隨著相對濕度而有所不同。由此可知，有機污染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，本計畫提出有效土壤污染濃度觀念，即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。考量到植作對於疏水性有機污染物的吸收攝取幾乎靠被動運輸的方式進行，因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。本期利用根系作物櫻桃蘿蔔、葉菜類作物青江菜和疏水性有機污染物十溴二苯醚與加保扶進行的土壤植栽試驗，結果顯示符合有效土壤污染濃度與模式的理論基礎，且此趨勢也可從固相微萃取結果反映出來。

疏水性有機污染物、植栽試驗、固相微萃取

EPA-105-1604-02-02_期末報告.pdf

9MB

2017/2/1 上午 12:00:00

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 (Raphanus sativus) and pak-choi (Brassica chinensis Linn) as model crops into soil containing different organic matter in which differential concentrations of BDE-209 and carbofuran were spiked. In addition, SPME experiments were carried out in contaminant-spiked soils. Results obtained from both pot and SPME experiments somehow agreed with the trend predicted by the partition theory.

Hydrophobic organic contaminants, pot experiments, SPME