Background and aims Vanadium (V), niobium (Nb), and tantalum (Ta), recognized as Technology-Critical Element (TCE), are highly growing in demand for industrial development. Despite their economic relevance, little is known about their environmental concentrations, especially in marine ecosystems like mangroves. This paper describes concentrations and distribution patterns of Group Va elements (V, Nb and Ta) in plant organs and sediments from diverse mangroves of the Indian Sundarbans. Method Sediment cores and plant organs of eight dominant mangrove species were sampled and analyzed for V, Nb and Ta by ICP-MS. Stable carbon isotope (δ 13 C) in mangrove leaves were analyzed by EA-IRMS. Result Mean concentrations (mg kg −1 ) of V, Nb and Ta decreased in the order V (84.7 ± 12.5) > Nb (37.5 ± 4) > Ta (3 ± 0.8) in the sediment and V (0.6 ± 0.6) > Nb (0.02) > Ta (0.002) in the mangrove plants. Species-specific variability in bioaccumulation factor (V: 0.012–0.035; Nb: 0.001–0.003; Ta: 0.001–0.005), translocation factor (V: 0.5–5.1; Nb: 0.26–7.06; Ta: 0.22–2.56) and enrichment factor (V: 0.008–0.027; Nb: 0.0002–0.001; Ta: 1.0 × 10 −5 -3.0 × 10 −6 ) indicated different partitioning of Group Va elements within the plant organs and varying degree of mangrove uptake efficiency. Conclusion Results showed a general decrease in V, Nb and Ta concentrations with their increasing atomic weight. Their total concentrations in plants were related to the degree of enrichment of substrate sediments. The phytoextraction capacity varied amongst mangrove species depending on their CO 2 uptake efficiency. Given increased demand for TCEs, results may have important implications for bioremediation processes.

中文翻译：

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钒 (V)、铌 (Nb) 和钽 (Ta) 在印度孙德尔本斯的不同红树林中的生物积累

背景和目标 钒 (V)、铌 (Nb) 和钽 (Ta) 被公认为技术关键元素 (TCE)，在工业发展中的需求不断增长。尽管它们具有经济相关性，但人们对其环境浓度知之甚少，尤其是在红树林等海洋生态系统中。本文描述了来自印度孙德尔本斯不同红树林的植物器官和沉积物中 Va 族元素（V、Nb 和 Ta）的浓度和分布模式。方法 对 8 种优势红树树种的沉积物核心和植物器官进行采样，并通过 ICP-MS 分析 V、Nb 和 Ta。EA-IRMS 分析了红树林叶子中的稳定碳同位素 (δ 13 C)。结果 V、Nb 和 Ta 的平均浓度 (mg kg -1 ) 以 V (84.7 ± 12.5) > Nb (37.5 ± 4) > Ta (3 ± 0.8) 和 V (0.6 ± 0) 的顺序降低。6) > Nb (0.02) > Ta (0.002) 在红树林植物中。生物积累因子（V：0.012–0.035；Nb：0.001–0.003；Ta：0.001–0.005）、易位因子（V：0.5–5.1；Nb：0.26–7.06；Ta：0.22）和富集的物种特异性变异性因子 (V: 0.008–0.027; Nb: 0.0002–0.001; Ta: 1.0 × 10 -5 -3.0 × 10 -6 ) 表明植物器官内 Va 族元素的不同分配和不同程度的红树林吸收效率。结论 结果表明，随着原子量的增加，V、Nb 和 Ta 的浓度普遍下降。它们在植物中的总浓度与底物沉积物的富集程度有关。植物提取能力因红树林物种的 CO 2 吸收效率而异。鉴于对传统文化表现形式的需求增加，