Dissolved organic matter affects the bioaccumulation of copper and lead in Chlorella pyrenoidosa: A case of long-term exposure.
Dissolved organic matter affects the bioaccumulation of copper and lead in Chlorella pyrenoidosa: A case of long-term exposure.
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DOI：
10.1016/j.chemosphere.2017.01.119
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发表时间：
2017-05
期刊：
影响因子：
8.8
通讯作者：
W. Shi;Zanfang Jin;Shiyin Hu;Xiaoman Fang;Feili Li
中科院分区：
文献类型：
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作者：
W. Shi;Zanfang Jin;Shiyin Hu;Xiaoman Fang;Feili Li
本研究评估了不同分子量 (MW) 的溶解有机物 (DOM) 对蛋白核小球藻长期接触铜和铅的影响。选择柠檬酸、黄腐酸和腐殖酸（按照 MW 递增的顺序）来代表 DOM。结果表明，分子量较大的DOM对铜对藻类的生物利用度有较强的抑制作用。然而，在DOM存在下，Pb的生物吸附等温线是不同的：随着Pb平衡浓度的增加，生物吸附能力急剧增加到最大值，然后下降。随着溶液 DOM 浓度和分子量的变化，最大值范围在 0.186 至 0.398 mmol g−1 之间，表现出 DOM、Pb 和藻类之间的化学计量关系。在有限的Pb浓度范围内形成Pb-DOM-藻类三元复合物，并提高了内化Pb的百分比。这项研究有助于了解 DOM 在浮游植物金属吸收中的作用。
This study evaluated the impact of dissolved organic matter (DOM) of varying molecule weights (MWs) on long-term exposure to Cu and Pb inChlorella pyrenoidosa. Citric acid, fulvic acid, and humic acid, in the order of increasing MWs, were selected to represent DOM. The results showed that DOM with larger MWs had stronger inhibitory effects on the bioavailability of Cu to algae. However, the biosorption isotherm of Pb in the presence of DOM was different: as Pb equilibrium concentration increased, the biosorption capacity increased sharply to a maximum, then decreased. The maximum values ranged between 0.186 and 0.398 mmol g−1, as the solution DOM concentration and MW changed, exhibiting a stoichiometric relationship between DOM, Pb and algae. The ternary complex of Pb-DOM-alga formed in a limited Pb concentration range, and increased the percentage of internalized Pb. This research helps to understand the role of DOM in metal uptake in phytoplankton.