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首页> 外文期刊>Environmental Science & Technology >Effect of Dunaliella tertiolecta Organic Exudates on the Fe(Ⅱ) Oxidation Kinetics in Seawater
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Effect of Dunaliella tertiolecta Organic Exudates on the Fe(Ⅱ) Oxidation Kinetics in Seawater

机译:杜氏杜氏藻有机渗出物对海水中Fe(Ⅱ)氧化动力学的影响

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摘要

The role played by the natural organic ligands excreted by the green algae Dunaliella tertiolecta on the Fe(Ⅱ) oxidation rate constants was studied at different stages of growth. The concentration of dissolved organic carbon increased from 2.1 to 7.1 mg L~(-1) over time of culture. The oxidation kinetics of Fe(Ⅱ) was studied at nanomolar levels and under different physicochemical conditions of pH (7.2-8.2), temperature (5-35 ℃), salinity (10-37), and dissolved organic carbon produced by cells (2.1-7.1 mg L~(-1)). The experimental rate always decreased in the presence of organic exudates with respect to that in the control seawater. The Fe(Ⅱ) oxidation rate constant was also studied in the context of Marcus theory, where ΔG° was 3931-51.48 kJ mol~(-1). A kinetic modeling approach was applied for computing the equilibrium and rate constants for Fe(Ⅱ) and exudates present in solution, the Fe(Ⅱ) speciation, and the contribution of each Fe(Ⅱ) species to the overall oxidation rate constant. The best fit model took into account two acidity equilibrium constants for the Fe(Ⅱ) complexing ligands with pK_(a,1) = 9.45 and pK_(a,2) = 4.9. The Fe(Ⅱ) complexing constants were K_(Fe(Ⅱ)-LH) = 3 × 10~(10) and K_(Fe(Ⅱ)-L) = 10~7, and the corresponding computed oxidation rates were 68 ± 2 and 36 ± 8 M~(-1) min~(-1), respectively.
机译:研究了绿藻杜氏藻分泌的天然有机配体在不同生长阶段对Fe(Ⅱ)氧化速率常数的影响。随着时间的推移,溶解有机碳的浓度从2.1 mg L〜(-1)增加到7.1 mg L〜(-1)。研究了Fe(Ⅱ)在纳摩尔浓度和不同理化条件下pH(7.2-8.2),温度(5-35℃),盐度(10-37)和细胞产生的溶解有机碳(2.1)下的氧化动力学。 -7.1 mg L〜(-1))。相对于对照海水,在有机渗出物存在的情况下,实验速率总是降低的。在Marcus理论的背景下,研究了Fe(Ⅱ)的氧化速率常数,其中ΔG°为3931-51.48 kJ mol〜(-1)。采用动力学建模方法计算了溶液中存在的Fe(Ⅱ)和渗出液的平衡和速率常数,Fe(Ⅱ)的形态以及每种Fe(Ⅱ)对总氧化速率常数的贡献。最佳拟合模型考虑了Fe(Ⅱ)配合配体的两个酸度平衡常数,pK_(a,1)= 9.45和pK_(a,2)= 4.9。 Fe(Ⅱ)的络合常数为K_(Fe(Ⅱ)-LH)= 3×10〜(10)和K_(Fe(Ⅱ)-L)= 10〜7,相应的计算氧化速率为68±2和36±8 M〜(-1)min〜(-1)。

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  • 来源
    《Environmental Science & Technology》 |2014年第14期|7933-7941|共9页
  • 作者单位

    Departamento de Quimica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canada, Campus de Tafira, 35017 Las Palmas, Spain;

    Departamento de Quimica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canada, Campus de Tafira, 35017 Las Palmas, Spain;

    Departamento de Quimica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canada, Campus de Tafira, 35017 Las Palmas, Spain;

    Departamento de Quimica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canada, Campus de Tafira, 35017 Las Palmas, Spain;

    Departamento de Quimica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canada, Campus de Tafira, 35017 Las Palmas, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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