Interdepartment of Environmental Science, Chulalongkorn University, Bangkok, Thailand.
Int J Phytoremediation. 2011 Apr;13(4):383-95. doi: 10.1080/15226514.2010.495145.
The potential of water lettuce (Pistia stratiotes L.) and duckweed (Lemna minor L.) to remove chlorpyrifos in water was investigated under laboratory greenhouse conditions. At initial chlorpyrifos concentrations of 0.0, 0.1 and 0.5 mg/L, the relative growth rates (RGR) of L. minor and P. stratiotes were not significantly different. In contrast, in the presence of 1 mg/L chlorpyrifos the RGR was significantly inhibited, giving an observed fresh weight based RGR(FW) for P. stratiotes and L. minor from day 0 to 7 of -0.036 and -0.023 mg/g/day, respectively. The maximum removal of chlorpyrifos by P. stratiotes and L. minor, when chlorpyrifos was at an initial culture concentration of 0.5 mg/L, was 82% and 87%, respectively, with disappearance rate constants under these conditions of 2.94, 10.21 and 12.14 microg h(-1) for the control (no plants), and with P. stratiotes and L. minor, respectively, giving actual corrected plant removal rate constants of 7.27 and 9.20 microg h(-1) for P. stratiotes and L. minor, respectively. The bioconcentration factor (BCF) of L. minor was significantly greater than that for P. stratiotes and therefore, at least under these greenhouse-based conditions, L. minor was more efficient than P. stratiotes for the accelerated removal of chlorpyrifos from water.
在实验室温室条件下，研究了水蕹菜（Pistia stratiotes L.）和浮萍（Lemna minor L.）去除水中氯菊酯的潜力。在初始氯菊酯浓度为 0.0、0.1 和 0.5 mg/L 的情况下，L. minor 和 P. stratiotes 的相对生长率（RGR）没有显著差异。相比之下，在 1 mg/L 氯菊酯存在的情况下，RGR 受到显著抑制，导致 P. stratiotes 和 L. minor 的观察到的基于鲜重的 RGR（FW）在 0 至 7 天分别为-0.036 和-0.023 mg/g/天。当氯菊酯的初始培养浓度为 0.5 mg/L 时，P. stratiotes 和 L. minor 对氯菊酯的最大去除率分别为 82%和 87%，在这些条件下的消失速率常数分别为 2.94、10.21 和 12.14μg h(-1)，而对照（无植物），分别为 P. stratiotes 和 L. minor 的实际修正植物去除速率常数分别为 7.27 和 9.20μg h(-1)。L. minor 的生物浓缩因子（BCF）明显大于 P. stratiotes，因此，至少在这些基于温室的条件下，L. minor 比 P. stratiotes 更有效地从水中加速去除氯菊酯。
