Langunu Serge, Imabo Precis Mpia Imanda, Bibi Fwanda Benie, Kilela Mwanasomwe Jacques, Colinet Gilles, Ngoy Shutcha Mylor
Ecology, Ecological Restoration and Landscape, Faculty of Agronomic Sciences, Université de Lubumbashi, Lubumbashi 1825, Democratic Republic of the Congo.
Water-Soil-Plant Unit, TERRA Gembloux Agro-Bio Tech, University of Liege, 5030 Gembloux, Belgium.
Toxics. 2023 Jul 17;11(7):620. doi: 10.3390/toxics11070620.
Copper smelting has been a source of soil contamination with trace metals in Penga Penga (Lubumbashi). The residents are exposed to trace metal ingestion, and planting trees is challenging in such soil conditions. Nevertheless, planting trees in former household dumps or using various types of amendments has allowed the provisioning of fruits in a few residences. From the perspective of scaling up the process, a survey has been conducted with the aim of assessing the effectiveness of the planting processes on the trace metal content in fruits and leaves of L. and (Willd) DC. Samples were collected from residential households in Penga Penga and Kalebuka (a non-polluted suburb). The bioconcentration factor (BCF) and the safe weekly consumption (SWC) were calculated for each species. The results showed higher values of total and soluble concentrations of Cu, Pb, and Zn in the rhizosphere of the two species in Penga Penga. Metal concentrations were higher in the fruits and leaves from Penga Penga, with 47% of samples above the FAO and WHO thresholds (vs. 18.5% in Kalebuka). The BCF values were below 1, demonstrating the effectiveness of the process in reducing the translocation of metals to leaves and fruits. Recommendations from the SWC limit Pb consumption to 9 kg for mango flesh and Cd consumption to 6.6 kg for fruits in Penga Penga (vs. 78 kg and 68 kg in Kalebuka). Finally, the results of this study provide interesting lessons for the scaling up and technical itinerary of planting trees in Penga Penga.
在彭加彭加（卢本巴希），铜冶炼一直是土壤中痕量金属污染的一个来源。居民面临痕量金属摄入风险，在这种土壤条件下种树具有挑战性。然而，在前家庭垃圾场种树或使用各种改良剂已使一些住宅能够收获水果。从扩大该过程的角度来看，已开展一项调查，旨在评估种植过程对 L. 和 （Willd）DC. 果实和叶片中痕量金属含量的有效性。样本从彭加彭加和卡莱布卡（一个无污染郊区）的居民家庭采集。计算了每个物种的生物富集系数（BCF）和安全每周摄入量（SWC）。结果表明，彭加彭加这两个物种根际中铜、铅和锌的总浓度和可溶性浓度较高。彭加彭加的果实和叶片中的金属浓度更高，47%的样本超过了粮农组织和世界卫生组织的阈值（而在卡莱布卡为18.5%）。BCF值低于1，表明该过程在减少金属向叶片和果实的转运方面是有效的。SWC的建议将彭加彭加芒果果肉中铅的摄入量限制在9千克， 果实中镉的摄入量限制在6.6千克（而在卡莱布卡分别为78千克和68千克）。最后，本研究结果为彭加彭加种树的扩大规模和技术路线提供了有趣的经验教训。
