氰化物污染的植物修复可行性研究

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Abstract

Cyanide is a high-volume production chemical and the most commonly used leaching reagant for gold and silver extraction. Its environmental behavior and fate is of significant concern because of its high toxicity. This paper presents an investigation of the feasibility of phytoremediation as an in- situ technique to treat cyanide-contaminated soil. Corn(Zea mays L.)and soybean(Glycine max(L.)Merr.)were used. Results from this tests indicated that low dose of cyanide(≤45.5 CN detectable effects under room temperature(23.0～26.0℃). Significant reduction in the plant growth rates(≥10%)was found at high cyanide concentration in the irrigation water(≥91.0 CN mg·L^-1)used. The potential of detached leaves to remove cyanide was also investigated. Excised plant leaves(1.5 g fresh weight)were kept in a glass vessel with with 100 mL spiked aqueous solution(deionized oxygen-saturated water)at 23.5℃ for 28 h. The disappearance of cyanide from the aqueous solution was tracked photometrically. More than 90% cyanide in the aqueous solution was removed by plant materials over a 28-h exposure period. The cyanide removal capacity was determined to be 4.43 and 3.42 mg CN·kg fresh weight^-1·hour^-1 for soybean and corn, respectively. Resutls from this investigation indicated that plants and plant materials were all found to be able to efficiently remove cyanide from the contaminated medium through their internal enzyme systems. In conclusion, cyanide elimination with plants seems to be a feasible option for cleaning soils contaminated with cyanide or gold and silver mine waste and wastewater.

Key words： Cyanide Phytoremediation Plants Removal Soil

Received: 25 April 2004

PACS:

X131

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	YU Xiao-zhang
	TRAPP Stefan

Cite this article:

YU Xiao-zhang,TRAPP Stefan. Feasibility of phytoremediation of cyanide contamiantion by soybean and corn[J]. , 2004, 23(2): 97-100.

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http://journal15.magtechjournal.com/Jwk_stkx/EN/ OR http://journal15.magtechjournal.com/Jwk_stkx/EN/Y2004/V23/I2/97

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