汽油添加剂甲基叔丁基醚(MTBE)污染的植物修复

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Abstract

Methyl tert-butyl ether (MTBE) is the most commonly used gasoline oxygenate in the North American's fuel industry.Due to its high solubility in water and low sorption tendency in soils,MTBE has become one of the most common contaminants in urban ground water.This paper examined the potential for phytoremediation of MTBE within a carefully designed bioreactor.Pre-rooted willow trees (Salix alba) were kept in an Erlenmeyer flask of 500 mL with 450 mL spiked aqueous solution for 12 d.MTBE and the main metabolite TBA were measured by GC/FID.Willow tree uptake tests indicated that the removal of MTBE mass in aqueous solution through willow tree activities was found in the range of 24.84~53.27% at 15·~25·over a 12-day period of exposure.The fraction of MTBE (%) removed from the aqueous solution by willow trees was positively correlated to tree transpiration (mg).Neither TBA,nor any other possible metabolite of MTBE was tracked in this test,indicating phytovolatilization is the dominant mechanism for phytoremediation of MTBE.Results of the bench-scale studies indicated that a large fraction of MTBE was released into the air without any conversion through willow trees over a short period of time,however MTBE will be susceptible to photooxidation and does not become an air quality concern.Therefore,it is to conclude that phytoremediation is an effective method to clean the soil and groundwater contaminated with MTBE.

Key words： MTBE Phytoremediation TBA Temperature Willow trees

Received: 25 April 2003

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	YU Xiao-zhang
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YU Xiao-zhang,TRAPP Stefan. The potential for phytoremediation of methyl tert-butyl ether (MTBE)[J]. , 2003, 22(2): 109-112.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2003/V22/I2/109

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