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在冰中由氧化还原驱动的Mn (III) 的形成

Tao Chen¹, Tra My Bui Thi¹, Tao Luo¹

¹École Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR 6226, Université de Rennes, F-35000 Rennes, France.

Environmental science & technology

|August 17, 2024

概括

结加快了 (Mn) 的反应,在自然水中形成溶解的Mn (III). 这个过程将反应剂集中在冰晶之间的液态水中,增强Mn (III) 的产生,特别是在寒冷的气候下.

科学领域:

环境化学环境化学
地质化学地质化学
水冰接口水冰接口

背景情况:

(Mn) 种在Mn (IV) 氧化物表面的氧化还原反应可以释放自然水中的溶解Mn (III).
酸盐 (PP) 作为一种模型连体,用于研究 (III) 复合和释放.

研究的目的:

为了研究冷对Mn (III) 在酸盐的存在下形成的作用.
阐明自然水系统中结促进的 (III) 生产的机制.

主要方法:

时间解析的冷实验在-20°C以不同的盐 (NaCl) 度进行.
连续的冷解周期实验,以评估累积的Mn (III) 产量.
温度解析的冷实验低至-50°C以确定最佳温度范围.

主要成果:

结显著加速和增强Mn (III) 形成作为Mn (III) -PP复合体.
液体内粒边界 (LIB) 中的氧化物和溶液的度驱动了反应.
低盐含量最大限度地提高了Mn(III) 的产量,而高盐含量最初促进了化物复合,但受到盐形成的限制.
连续的冷解循环导致了大量的化物转化 (高达80%),这是由于反复释放反应剂.
反应性持续到 -50 °C,可能是由于超冷水和氧化物结合的水膜.

结论:

结是促进二氧化物 (MnIII) 通过二氧化物 (MnII) 和四氧化物 (MnIV) 的分解而产生二氧化物的关键因素.
这种由结驱动的过程可以在寒冷环境中显著促进溶解的 (III) 池.
这些发现突显了结解周期在天然水和沉积物中的生物地球化学循环中的重要性.

关键词:

生物地化学循环的生物地化学循环.冰冰冰冰冰冰酸是一种酸.氧化氧化还原技术是什么

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