In unregulated mining and processing for Cu and Au, large amounts of heavy metals and metalloids are generated as tails. These wasted by-products could actually pose serious environmental problems. The objective of this study was to assess the potential ability of Alternanthera sessilis and Aster philippinensis thriving abundantly in a small-scale mine processing site at Kias, Benguet, for possible Cu, Pb, Zn, and As uptake. It also aimed to determine the cellular localization of the contaminants within the plant biomass. Alternanthera sessilis and Aster philippinensis exhibited low bioaccumulation factor (BF) and translocation factor (TF) values for Cu, Pb, Zn, and As. The BF and TF values could suggest possible exclusion mechanisms of the plants in avoiding phytotoxicity. SEM-EDX analysis of the Alternanthera sessilis roots indicated higher weight % of Cu, Pb, and As in the epidermis, and Zn in the cortex. On the other hand, Aster philippinensis roots showed high weight % of Zn and As in the epidermis and Cu and Pb in the cortex. The localization of the contaminants in the root epidermal and cortical cells signifies restriction of their mobility to the xylem, preventing migration to the shoot system. The findings of this study suggest that Alternanthera sessilis and Aster philippinensis are considered potential phytostabilizers capable of immobilizing contaminant toxicity in the soil and in the rhizosphere.

中文翻译：

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在菲律宾本圭特市Kias的一个小型Cu-Au加工地点评估sesselis和aster philippinensis作为排除者。

在无规开采和加工铜和金时，会产生大量的重金属和准金属作为尾矿。这些浪费的副产品实际上可能造成严重的环境问题。这项研究的目的是评估在本格特州Kias的一个小型矿山加工场中，丰富的Alternanthera sessilis和Aster philippinensis对Cu，Pb，Zn和As吸收的潜在能力。它还旨在确定植物生物质中污染物的细胞定位。芝麻树和菲律宾紫ster对铜，铅，锌和砷显示出较低的生物累积因子（BF）和转运因子（TF）值。BF和TF值可能表明植物在避免植物毒性方面的可能排除机制。芝麻树根的SEM-EDX分析表明，表皮中的Cu，Pb和As含量较高，而皮层中的Zn含量较高。另一方面，紫ster的根在表皮中的锌和砷的重量百分比较高，在皮层中的铜和铅的重量百分比较高。污染物在根表皮和皮层细胞中的定位表明它们对木质部的迁移受到限制，从而阻止了向芽系统的迁移。这项研究的结果表明，中华绒螯蟹和菲律宾紫ster 被认为是潜在的植物稳定剂，能够稳定土壤和根际中的污染物毒性。