Elemental distribution and chemical speciation of copper and cobalt in three metallophytes from the copper-cobalt belt in Northern Zambia.,Metallomics

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Elemental distribution and chemical speciation of copper and cobalt in three metallophytes from the copper-cobalt belt in Northern Zambia.
Metallomics ( IF 2.9 ) Pub Date : 2020-04-07 , DOI: 10.1039/c9mt00263d
Antony van der Ent ₁ , Royd Vinya , Peter D Erskine , François Malaisse , Wojciech J Przybyłowicz , Alban D Barnabas , Hugh H Harris , Jolanta Mesjasz-Przybyłowicz

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Three metallophyte species, Persicaria capitata, P. puncata (Polygonaceae), Conyza cordata (Asteraceae) from mineral wastes in the Zambian copper–cobalt belt were studied. This study focused on the elemental distribution in the roots, stems and leaves, using a range of techniques: micro-PIXE, SEM-EDS synchrotron XFM and XAS. The species differed in their responses to growing on Co–Cu-enriched soils: Persicaria puncata is a Co hyperaccumulator (up to 1060 μg g⁻¹ in leaves), while Persicaria capitata and Conyza cordata are Co-excluders. All three species are Cu-accumulators. The highest concentrations of Cu–Co are in the epidermal cells, whereas in Persicaria puncata Co was also enriched in the phloem. The Co coordination chemistry shows that an aqueous Co(II)–tartrate complex was the predominant component identified in all plants and tissues, along with a minor component of a Co(III) compound with oxygen donor ligands. For Cu, there was considerable variation in the Cu speciation in the various tissues and across the three species. In contrast to hyperaccumulator plants, excluder and accumulator type plants have received far less attention. This study highlights the different biopathways of transition elements (Cu, Co) in hyper-tolerant plant species showing different responses to metalliferous environments.

中文翻译：

赞比亚北部铜钴带中三种金属植物中铜和钴的元素分布和化学形态。

研究了赞比亚铜钴带矿产废料中的三种金属植物种类，Persicaria capitata，P。puncata（Polygonaceae），Conyza cordata（Asteraceae）。这项研究使用多种技术集中于根，茎和叶中的元素分布：micro-PIXE，SEM-EDS同步加速器XFM和XAS。该物种对在富含Co-Cu的土壤上生长的反应有所不同：Persicaria puncata是Co的超蓄积体（叶片中高达1060μgg ^-1），而Persicaria capitata和Conyza cordata是Co-excloders。这三种都是铜积累剂。表皮细胞中Cu-Co的浓度最高，而表皮细胞中多年生草本植物Persicaria puncata Co也富含韧皮部。Co配位化学表明，在所有植物和组织中，Co（II）-酒石酸钴水溶液均是主要成分，而辅以Co（III）化合物的次要成分是氧供体。对于铜，在各种组织中以及在这三种物种中，铜的形态存在相当大的差异。与超蓄能电站相反，排外型和蓄能型电站受到的关注要少得多。这项研究突出了高耐受性植物物种中过渡元素（Cu，Co）的不同生物途径，显示出对金属环境的不同响应。

更新日期：2020-04-07

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