Department of Earth and Environmental Studies, Montclair State University, One Normal Avenue, Montclair, NJ 07104, USA.
Environ Pollut. 2010 May;158(5):1980-3. doi: 10.1016/j.envpol.2009.12.011. Epub 2010 Jan 4.
The high affinity of vetiver grass for 2,4,6 trinitrotoluene (TNT) and the catalytic effectiveness of urea in enhancing plant uptake of TNT in hydroponic media we earlier demonstrated were further illustrated in this soil-pot-experiment. Complete removal of TNT in urea-treated soil was accomplished by vetiver at the low initial soil-TNT concentration (40 mg kg(-1)), masking the effect of urea. Doubling the initial TNT concentration (80 mg kg(-1)) significantly (p<0.002) increased TNT removal by vetiver, in the presence of urea. Without vetiver grass, no significant (p=0.475) change in the soil-TNT concentrations was observed over a period of 48 days, suggesting that natural attenuation of soil TNT could not explain the documented TNT disappearance from soil.
在水培介质中，香根草对 2,4,6-三硝基甲苯（TNT）的高亲和力和尿素对提高植物对 TNT 吸收的催化作用，我们之前已经证明，在这项土壤盆栽实验中得到了进一步的说明。在低初始土壤 TNT 浓度（40mg/kg）下，尿素处理的土壤中 TNT 完全被香根草去除，掩盖了尿素的作用。在尿素存在的情况下，将初始 TNT 浓度（80mg/kg）增加一倍，显著（p<0.002）增加了香根草对 TNT 的去除。没有香根草，在 48 天的时间内，土壤中 TNT 的浓度没有明显变化（p=0.475），这表明土壤 TNT 的自然衰减不能解释文献中记录的土壤 TNT 消失。
