Influence of lead-doped hydroponic medium on the adsorption/bioaccumulation processes of lead and phosphorus in roots and leaves of the aquatic macrophyte Eicchornia crassipes.
Influence of lead-doped hydroponic medium on the adsorption/bioaccumulation processes of lead and phosphorus in roots and leaves of the aquatic macrophyte Eicchornia crassipes.
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DOI：
10.1016/j.jenvman.2013.09.012
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发表时间：
2013-11
影响因子：
8.7
通讯作者：
F. Espinoza-Quiñones;A. Módenes;A. D. de Oliveira;D. Trigueros
中科院分区：
文献类型：
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作者：
F. Espinoza-Quiñones;A. Módenes;A. D. de Oliveira;D. Trigueros
在这项研究中，研究了自由漂浮的水生大型植物凤眼莲在不同水培条件下磷和铅浓度变化的铅生物累积情况。在温室中进行了一系列在宽浓度范围内掺杂铅和磷的水培介质中的生长实验，为期 32 天。所有实验都是在定期更换所有营养素和铅的情况下进行的。通过同步辐射激发全反射X射线荧光测定生物质中铅和营养物质的浓度。通过增加培养基中的铅浓度，观察到生物量生长减少，但在较低的铅浓度下，根和叶中的磷保留量较高。此外，当培养基中的铅和磷浓度较高时，观察到根部生物累积的铅和磷的量增加，分别达到 4 mg Pb g−1 和 7 mg P g−1 的饱和值。测试了四种非结构动力学模型，以代表根部中铅和磷的生物累积。伪二级和不可逆动力学模型很好地描述了铅的生物富集数据，然而，不可逆动力学模型更适合根部的磷吸收。
In this study, lead bioaccumulation by the living free-floating aquatic macrophyteEicchornia crassipesin different hydroponic conditions with variations in phosphorus and lead concentrations was investigated. A set of growth experiments in hydroponic media doped with lead and phosphorus within a wide concentration range was performed for 32 days in a greenhouse. All experiments were carried out with periodic replacement of all nutrients and lead. The concentration of lead and nutrients in biomass was determined by synchrotron radiation-excited total reflection X-ray fluorescence. By increasing the lead concentration in the medium, a reduction in biomass growth was observed, but a higher phosphorus retention in roots and leaves was shown at lower lead concentrations. In addition, an increase in the amount of bioaccumulated lead and phosphorus in roots was observed for higher lead and phosphorus concentrations in the medium, reaching saturation values of 4 mg Pb g−1and 7 mg P g−1, respectively. Four non-structural kinetic models were tested, to represent the bioaccumulation of lead and phosphorus in roots. Pseudo-second order and irreversible kinetic models described the lead bioaccumulation data well, however, an irreversible kinetic model better fitted phosphorus uptake in roots.