溴化十四烷基吡啶对黑麦草吸收土壤中菲的影响

研究了澳化十四烷基吡啶(Myrlstylpyridinium bromide,MPB)对黑麦草吸收土壤中菲的影响.结果表明.由于MPB能显著增强吸附固定土壤中的菲,限制其从土壤固相向土壤水相迁移,从而可降低土壤水相中菲浓度,导致黑麦草吸收积累菲的程度降低.在两种不同菲污染水平的土壤中,MPB添加浓度为0～600 mg·kg-1时,黑麦草根系和茎叶中菲含量均随MPB添加量的增加而降低.当MPB添加浓度为600 mg·kg-1时.黑麦草根系菲含量分别为0.12 mg·kg-1和0.35 mg·kg-1,分别比对照低了77.0%和53.3%;茎叶中菲含量为0.12 mg·kg-1和0.26 mg·kg-1,分别比对照低了64.7%和50.9%.

Effect of myristylpyridinium bromide on uptake of phenanthrene by ryegrass

The cationic surfactant myristylpyridinium bromide (MPB) enhances the immobilization of phenanthrene in soils and reduces its uptake by ryegrass. The reduction of phenanthrene uptake from spiked soils by ryegrass was correlated with the enhanced immobilization of phenanthrene by MPB, which restricted the transfer of phenanthrene from soil solid to soil water, reducing its concentration in soil solution. The concentrations of phenanthrene in ryegrass decreased with the increase of MPB concentration from 0 to 600 mg·kg-1 in two contaminated soils. The concentrations of phenanthrene in ryegrass roots were 0.12 mg·kg-1 and 0.35 mg·kg-1 in the two soils when the MPB concentration was 600 mg·kg-1 , 77.0% and 53.3% lower than the phenanthrene concentrations in the controls. Meanwhile, the concentrations of phenanthrene in ryegrass shoots were 0.12 mg·kg-1 and 0.26 mg·kg-1, 64.7% and 50.9% lower than those of the control.