School of Chemistry, University of KwaZulu-Natal, Durban, South Africa.
J Environ Sci Health B. 2011;46(3):247-56. doi: 10.1080/03601234.2011.540533.
In this study the elemental distribution of selected essential (Ca, Mg, Al, Mn, Cu, Fe, Co, Cr, Zn, Ni and Se) and the non-essential (Pb, Hg and As) elements were determined in the bulb and peel of Amadumbe (Colocasia esculenta) samples from eight different sites in KwaZulu-Natal, South Africa. The concentration of Se and As in the soil and in the Amadumbe bulbs were below the detection limit of 0.09 μg g⁻¹. The total and bioavailable concentrations of the elements in conjunction with pH, soil organic matter (SOM) and cation exchange capacity (CEC) were determined in the soil samples from the eight sites. Statistical analysis was done to evaluate the impact of soil quality parameters on the chemical composition of the Amadumbe root. The results show accumulation or exclusion of certain elements by the bulb as evidenced by the noticeable increase or decrease of the concentrations of elements, respectively. Ca and Mg were found to be major elements in the range (2000-12000 μg g⁻¹), whilst Mn, Zn, Fe and Al were found to be minor elements in the range (20-400 μg g⁻¹). A general trend observed was that the plant favours the absorption of Zn over Cu. A positive correlation between Mg & Ca, Cu & Fe and Co & Ni was also observed. Statistical analysis revealed that the plant tended to accumulate Mg, Ca, Co, Cr and Pb whilst it excluded Hg and Fe, to a lesser extent.
在这项研究中，对来自南非夸祖鲁-纳塔尔省 8 个不同地点的阿玛杜姆贝（Colocasia esculenta）样本的球茎和果皮中的选定必需元素（Ca、Mg、Al、Mn、Cu、Fe、Co、Cr、Zn、Ni 和 Se）和非必需元素（Pb、Hg 和 As）的元素分布进行了测定。土壤和阿玛杜姆贝球茎中的 Se 和 As 浓度低于 0.09μg g⁻¹的检测限。在 8 个地点的土壤样品中，测定了元素的总量和生物可利用浓度，以及 pH 值、土壤有机质（SOM）和阳离子交换容量（CEC）。进行了统计分析，以评估土壤质量参数对阿玛杜姆贝根化学成分的影响。结果表明，球茎对某些元素的积累或排斥，这分别表现为元素浓度的明显增加或减少。Ca 和 Mg 是主要元素，浓度范围在 2000-12000μg g⁻¹之间，而 Mn、Zn、Fe 和 Al 是次要元素，浓度范围在 20-400μg g⁻¹之间。观察到的一个普遍趋势是，植物更倾向于吸收 Zn 而不是 Cu。还观察到 Mg 和 Ca、Cu 和 Fe 以及 Co 和 Ni 之间存在正相关。统计分析表明，植物倾向于积累 Mg、Ca、Co、Cr 和 Pb，而排斥 Hg 和 Fe，只是程度较小。
