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Unravelling Metal Speciation in the Microenvironment Surrounding Phytoplankton Cells to Improve Predictions of Metal Bioavailability.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.est.9b07773 Fengjie Liu 1 , Qiao-Guo Tan 2 , Dominik Weiss 1, 3 , Anne Crémazy 4 , Claude Fortin 5 , Peter G C Campbell 5
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.est.9b07773 Fengjie Liu 1 , Qiao-Guo Tan 2 , Dominik Weiss 1, 3 , Anne Crémazy 4 , Claude Fortin 5 , Peter G C Campbell 5
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A lack of knowledge on metal speciation in the microenvironment surrounding phytoplankton cells (i.e., the phycosphere) represents an impediment to accurately predicting metal bioavailability. Phycosphere pH and O2 concentrations from a diversity of algae species were compiled. For marine algae in the light, the average increases were 0.32 pH units and 0.17 mM O2 in the phycosphere, whereas in the dark the average decreases were 0.10 pH units and 0.03 mM O2, in comparison to bulk seawater. In freshwater algae, the phycosphere pH increased by 1.28 units, whereas O2 increased by 0.38 mM in the light. Equilibrium modeling showed that the pH alteration influenced the chemical species distribution (i.e., free ion, inorganic complexes, and organic complexes) of Al, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb, Sc, Sm, and Zn in the phycosphere, and the O2 fluctuation increased oxidation rates of Cu(I), Fe(II) and Mn(II) from 2 to 938-fold. The pH/O2-induced changes in phycosphere metal chemistry were larger for freshwater algae than for marine species. Reanalyses of algal metal uptake data in the literature showed that uptake of the trivalent metals (Sc, Sm and Fe), in addition to divalent metals, can be better predicted after considering the phycosphere chemistry.
中文翻译：
揭示浮游植物周围微环境中的金属形态，以改善对金属生物利用度的预测。
浮游植物细胞（即浮游层）周围微环境中金属形态的知识不足，阻碍了准确预测金属生物利用度。汇编了来自多种藻类的藻圈pH和O 2浓度。与大量海水相比，光中海藻的平均增加量为0.32 pH单位和0.17 mM O 2，而在黑暗中，平均减少量为0.10 pH单位和0.03 mM O 2。在淡水藻类中，藻圈pH值增加了1.28个单位，而O 2在光线下增加了0.38 mM。平衡模型表明，pH值变化会影响Al，Cd，Co，Cu，Fe，Hg，Mn，Ni，Pb，Sc，Sm和Zn的化学物质分布（即，游离离子，无机络合物和有机络合物）在大气层中，O 2的波动将Cu（I），Fe（II）和Mn（II）的氧化速率提高了2倍至938倍。pH / O 2诱导的淡水藻类的藻圈金属化学变化大于海洋物种。对文献中藻类金属吸收数据的重新分析表明，在考虑了大气层化学性质后，除二价金属外，还可以更好地预测三价金属（Sc，Sm和Fe）的吸收。
更新日期：2020-07-07
中文翻译：
揭示浮游植物周围微环境中的金属形态，以改善对金属生物利用度的预测。
浮游植物细胞（即浮游层）周围微环境中金属形态的知识不足，阻碍了准确预测金属生物利用度。汇编了来自多种藻类的藻圈pH和O 2浓度。与大量海水相比，光中海藻的平均增加量为0.32 pH单位和0.17 mM O 2，而在黑暗中，平均减少量为0.10 pH单位和0.03 mM O 2。在淡水藻类中，藻圈pH值增加了1.28个单位，而O 2在光线下增加了0.38 mM。平衡模型表明，pH值变化会影响Al，Cd，Co，Cu，Fe，Hg，Mn，Ni，Pb，Sc，Sm和Zn的化学物质分布（即，游离离子，无机络合物和有机络合物）在大气层中，O 2的波动将Cu（I），Fe（II）和Mn（II）的氧化速率提高了2倍至938倍。pH / O 2诱导的淡水藻类的藻圈金属化学变化大于海洋物种。对文献中藻类金属吸收数据的重新分析表明，在考虑了大气层化学性质后，除二价金属外，还可以更好地预测三价金属（Sc，Sm和Fe）的吸收。
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