萝卜对邻苯二甲酸酯(PAEs)吸收累积特征及途径的初步研究

A pot experiment was conducted to investigate the possible pathways through which PAEs are accumulated in radish plants(Raphanus Sativus), Six treatments were set in the experiment： (1) untreated soil in open air (served as Control 1), (2) untreated soil in a greenhouse (served as Control 2), (3) artificially contaminated soil in open air, (4) artificially contaminated soil in a greenhouse, (5) artificially contaminated soil capped with a thin layer of untreated soil in open air, and (6) artificially contaminated soil capped with a thin layer of untreated soil in a greenhouse. The concentrations of PAEs in shoots and roots were detected by gas chromatography-mass spectrum (GC/MS). The results showed that the concentrations of DEP in both roots and shoots of radish plants for all the treatments were below the detection limit. The concentrations of DBP and DEHP in both shoots and roots were positively related to those in the soils. Both DBP and DEHP were mainly occurred in shoots with the concentration of DBP being higher than that of DEHP in the same shoot. Concentrations of both DBP and DEHP in shoots were only slightly higher in the plant grown in the uncapped soil than in the corresponding capped soil, indicating that the accumulation of DBP and DEHP in the shoots of radish were primarily through root uptake, shoot uptake of DBP and DEHP volatilizing from polluted soil was minor. It was also found that the concentrations of DBP in shoots were higher in the radish plants grown in the glasshouse than in the open air.