Biology Department, College of Science, King Khalid University, Abha 61321, Saudi Arabia; Botany Department, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt.
Botany Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
Sci Total Environ. 2021 Aug 15;782:146887. doi: 10.1016/j.scitotenv.2021.146887. Epub 2021 Apr 1.
The principal objective of this study is to generate mathematical regression equations that facilitate the estimation of the extent to which Eichhornia crassipes (C. Mart.) Solms, water hyacinth, absorbs heavy metals (HMs) into four plant organs (laminae, petioles, roots, and stolons). This study considers the absorption of nine HMs (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn), and the E. crassipes evaluated in this study were located in three irrigation canals in the North Nile Delta in Egypt, with sampling being conducted in both monospecific and homogenous E. crassipes. Samples of both E. crassipes and water were collected on a monthly basis during one growing season. Analysis of the water samples showed that the HM concentrations ranged from 1.1 μg/l for Cd to 2079.8 μg/l for Fe. All HMs were more concentrated in the E. crassipes roots than in any other organ. Typically, there was a significant correlation between the HM levels in the water and the HM levels in the E. crassipes organs. E. crassipes was documented by a bioconcentration factor > 1.0 for all HMs. The translocation factor in this study was <1.0 for all HMs. The t-values that referred to the discrepancies between the measured and predicted values of the HMs in the four E. crassipes organs were not significant. This finding can be considered to be an indication of the goodness of fit with respect to the ability of the equations to forecast HM uptake. Therefore, the developed equations will benefit the prediction of HM uptake by E. crassipes grown in irrigation canals in the Nile Delta. The efficacy of E. crassipes as a metric for gauging the aggregate impact of environmental pollution in water sources and its potential application in biomonitoring are confirmed in this study.
本研究的主要目的是生成数学回归方程，以估算凤眼蓝（C. Mart.）索姆斯吸收重金属（HM）进入四个植物器官（叶片、叶柄、根和匍匐茎）的程度。本研究考虑了 9 种 HM（Cd、Co、Cr、Cu、Fe、Mn、Ni、Pb 和 Zn）的吸收，本研究中评估的凤眼蓝位于埃及尼罗河北部的三个灌溉渠中，在单一种和均匀的凤眼蓝中进行了采样。在一个生长季节中，每月采集一次凤眼蓝和水样。对水样的分析表明，HM 浓度范围从 Cd 的 1.1μg/l 到 Fe 的 2079.8μg/l。所有 HM 在凤眼蓝的根中都比其他器官更为集中。通常，水中的 HM 水平与凤眼蓝器官中的 HM 水平之间存在显著相关性。所有 HM 的生物浓缩系数（BCF）均大于 1.0。本研究中转运系数（TF）均小于 1.0。HM 在四个凤眼蓝器官中的实测值与预测值之间差异的 t 值不显著。这一发现可以被认为是对方程预测 HM 吸收能力的拟合程度的良好指示。因此，所开发的方程将有助于预测尼罗河流域灌溉渠中生长的凤眼蓝对 HM 的吸收。本研究证实了凤眼蓝作为衡量水源环境污染综合影响的指标的有效性及其在生物监测中的潜在应用。
