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首页> 外文期刊>Environmental toxicology and chemistry >MORE THAN INORGANIC COPPER IS BIOAVAILABLE TO AQUATIC MOSSES AT ENVIRONMENTALLY RELEVANT CONCENTRATIONS
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MORE THAN INORGANIC COPPER IS BIOAVAILABLE TO AQUATIC MOSSES AT ENVIRONMENTALLY RELEVANT CONCENTRATIONS

机译：在与环境有关的浓度下，比铜更易产生水生苔藓

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摘要

The present study investigates how dissolved organic matter (DOM) alters copper bioavailability at environmentally relevant concentrations (1-5 μg/L of dissolved copper, 1-4 mg/L of dissolved organic copper). A methodology combining two biological endpoints (short-term and steady-state bioaccumulation of copper by the aquatic moss Fontinalis antipyretica) and a sampling of labile copper with diffusion gradient in thin films (DGT) is proposed for batch experiments conducted with mineral water and various DOM, ethylenediaminetetra-acetic acid (EDTA), humic acid, and natural Seine River (France) extracts (hydro-phobic and transphilic fractions). All types of DOM reduce the bioavailability of copper to aquatic mosses, and this reduction was more pronounced for the short-term biological endpoint, which was taken as being representative for environmental exposure. Labile copper sampled with DGT made it possible to estimate short-term bioaccumulation in the case of EDTA and natural Seine River extracts. With humic acid solutions, however, labile copper was lower than bioavailable copper. This result suggests that at realistic metal concentrations and with certain types of natural DOM, bioavailable copper might comprise not only inorganic copper but also some weak organic complexes. Hence, labile copper, in situ sampled with DGT, might not systematically overestimate bioavailable copper, as suggested previously on the basis of in vitro toxicity studies.
机译：本研究调查了在环境相关浓度（1-5μg/ L的可溶性铜，1-4 mg / L的可溶性有机铜）下，可溶性有机物（DOM）如何改变铜的生物利用度。提出了一种方法，该方法结合了两个生物学终点（水生苔藓Fontinalis antipyretica对铜的短期和稳态生物富集）和在薄膜中具有扩散梯度的不稳定铜的采样（DGT），用于使用矿泉水和各种水进行分批实验。 DOM，乙二胺四乙酸（EDTA），腐殖酸和天然塞纳河（法国）提取物（疏水和亲和级分）。所有类型的DOM都会降低铜对水生苔藓的生物利用度，并且这种减少对于短期生物终点更为明显，这被认为是环境暴露的代表。用DGT采样的不稳定铜使得可以估计EDTA和天然塞纳河提取物的短期生物富集。但是，在腐殖酸溶液中，不稳定的铜低于可生物利用的铜。该结果表明，在现实的金属浓度和某些类型的天然DOM下，可生物利用的铜可能不仅包括无机铜，而且还包括一些弱有机配合物。因此，如先前在体外毒性研究的基础上所建议的那样，用DGT原位采样的不稳定铜可能不会系统地高估生物利用度的铜。

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