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首页> 外文期刊>Environmental toxicology and chemistry >ANODIC STRIPPING VOLTAMMETRY MEASURES COPPER BIOAVAILABILITY FOR SEA URCHIN LARVAE IN THE PRESENCE OF FULVIC ACIDS
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ANODIC STRIPPING VOLTAMMETRY MEASURES COPPER BIOAVAILABILITY FOR SEA URCHIN LARVAE IN THE PRESENCE OF FULVIC ACIDS

机译：褐藻酸存在下阳极溶出伏安法测定海胆幼虫的铜生物利用度

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摘要

Copper speciation in the presence of fulvic acids (FAs) was studied in chemically defined seawater by square wave anodic stripping voltammetry (SQWASV). A simple complexation model assuming a single type of ligand and a 1:1 reaction stoichiometry successfully explained the measured data. A conditional stability constant of 5.80 ± 0.07 and a complexing capacity of 610 ± 80 μmol Cu/g FAs were obtained. This conditional stability constant would correspond to 7.23 on a free copper ion basis. The complexation kinetics was easily followed by anodic stripping voltammetry (ASV) measurements, and complexation equilibria were not reached until approximately 12 h. Coupled to speciation studies, the toxicity of copper in the presence of FAs was studied with the sea urchin Paracentrotus lividus embryogenesis bioassay. A clear protective effect of FAs was observed on Cu toxicity, and this effect could be accurately explained by SQWASV Cu speciation measurements. Additional experiments in the presence of high Cu and FA concentrations were performed, and no extra toxicity of Cu-FA complexes was observed. These results are in agreement with metal bioavailability models and also underline the usefulness of ASV for determining copper bioavailability in the presence of natural organic matter.
机译：通过方波阳极溶出伏安法（SQWASV）在化学定义的海水中研究了富里酸（FAs）存在下的铜形态。假设单一类型的配体和​​1：1反应化学计量的简单络合模型成功地解释了测量数据。获得的条件稳定性常数为5.80±0.07，络合能力为610±80μmolCu / g FAs。该条件稳定性常数在游离铜离子基础上相当于7.23。阳极溶出伏安法（ASV）可以很容易地跟踪络合动力学，并且直到约12 h才达到络合平衡。结合物种研究，使用海胆Paracentrotus lividus胚胎发生生物测定法研究了FAs存在下铜的毒性。观察到FAs对Cu毒性有明显的保护作用，并且可以通过SQWASV Cu形态测量准确地解释这种作用。在高Cu和FA浓度下进行了其他实验，未观察到Cu-FA复合物的额外毒性。这些结果与金属生物利用度模型一致，也强调了ASV在确定天然有机物存在下测定铜生物利用度方面的有用性。

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