Do nanoplastics impact Pb up-taking by Hordeum vulgare L.?

IF 4.7 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

NanoImpact Pub Date : 2024-07-01 DOI:10.1016/j.impact.2024.100526

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Abstract

Most studies on nanoplastics (NPs) focus on aquatic environments, overlooking their combined bioaccumulation with pollutants in terrestrial ecosystems. This study addresses a part of this gap by investigating how polystyrene nanoplastics (PS-NPs) affect the bioaccumulation and translocation of lead (Pb) in Hordeum vulgare L. plants. Using the RHIZOtest device for precise soil contamination control, we quantified PS-NPs (50 nm) in plant shoots via pyrolysis-gas chromatography/mass spectrometry (Py-GCMS) after plant KOH digestion. Our findings revealed that PS-NPs reduce Pb bioaccumulation and make adsorbed Pb onto PS-NPs less bioavailable to plants. For the highest Pb concentration, the Pb uptake index (PUI) followed the trend: Free Pb > NPs + Pb > Pb primary adsorbed by NPs, showing reduced Pb translocation to shoots in the presence of PS-NPs. Moreover, the presence of Pb decreased the bioavailability of PS-NPs probably in response to PS-NPs aggregation or modified charge. The PS-NPs concentrations in shoots range from 275.2 to 400 μg g⁻¹, representing 3.9 to 5.75% of the total PS-NPs. This study highlights the intricate interactions between nanoplastics and metals in soil-plant systems and emphasizes the need for further research on their combined effects and potential risks to food safety.

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纳米塑料是否会影响 Hordeum vulgare L. 对铅的吸收？

大多数有关纳米塑料（NPs）的研究都集中在水生环境中，忽略了它们与陆地生态系统中污染物的生物累积性。本研究通过研究聚苯乙烯纳米塑料（PS-NPs）如何影响铅（Pb）在大麦（Hordeum vulgare L.）植物中的生物累积和转移，弥补了这一空白。我们使用 RHIZOtest 设备精确控制土壤污染，在植物 KOH 消化后，通过热解-气相色谱/质谱法（Py-GCMS）对植物芽中的 PS-NPs （50 nm）进行了定量。我们的研究结果表明，PS-NPs 可减少铅的生物累积，并降低吸附在 PS-NPs 上的铅对植物的生物可利用性。在最高的铅浓度下，铅吸收指数（PUI）呈以下趋势：游离 Pb > NPs + Pb > NPs 主要吸附的 Pb，这表明在有 PS-NPs 存在的情况下，Pb 向嫩枝的转移减少了。此外，Pb 的存在降低了 PS-NPs 的生物利用率，这可能与 PS-NPs 聚合或电荷改变有关。芽中的 PS-NPs 浓度在 275.2 至 400 μg g-1 之间，占 PS-NPs 总量的 3.9 至 5.75%。这项研究强调了纳米塑料和金属在土壤-植物系统中错综复杂的相互作用，并强调有必要进一步研究它们的综合效应和对食品安全的潜在风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

NanoImpact Social Sciences-Safety Research

CiteScore

11.00

自引率

6.10%

发文量

审稿时长

23 days

期刊介绍： NanoImpact is a multidisciplinary journal that focuses on nanosafety research and areas related to the impacts of manufactured nanomaterials on human and environmental systems and the behavior of nanomaterials in these systems.