Evaluation of dissipation mechanisms for benzo[a]pyrene in the rhizosphere of tall fescue

被引:67
作者
Banks, MK [1 ]
Lee, E
Schwab, AP
机构
[1] Purdue Univ, Sch Civil Engn, W Lafayette, IN 47907 USA
[2] Kansas State Univ, Dept Civil Engn, Manhattan, KS 66506 USA
[3] Purdue Univ, Dept Agron, W Lafayette, IN 47907 USA
关键词
D O I
10.2134/jeq1999.00472425002800010036x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Although polycyclic aromatic hydrocarbons are common contaminants in soil and are potentially carcinogenic and mutagenic, little is known about their fate in the soil/root environment. The impart of tall fescue (Festuca arundinacea Schreber) on chemical and biological transformations of benzo[a]pyrene in soil was investigated in a greenhouse experiment in which C-14-benzo[a]pyrene was added to soil and placed in sealed chambers with and without plants. The distribution of C-14 in soil, plant tissue, and CO2 was quantified. Dissipation due to mineralization and volatilization accounted for <2% of the total C-14 added in both planted and unplanted chambers and was greater in the presence of plants. Plant uptake of C-14 was <0.12%. Residual benzo[a]pyrene was lower in soil with plants (44%) than in the absence of plants (53%), The majority of the C-14 label was associated with the soil matrix. The presence of plants enhance the degradation of highly adsorbed, recalcitrant benzo[a]pyrene in soil.
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页码:294 / 298
页数:5
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