冰作为氧酸盐促进铁氧化溶解的动力和机械驱动因素
Angelo P Sebaaly1, Frank van Rijn1, Khalil Hanna2
1Department of Chemistry, Umeå University, Umeå SE 901 87, Sweden.
概括
结将矿物质和氧酸盐集中在冰中,即使在-30°C,铁也会溶解. 冰解周期进一步增强铁的释放,影响冰环境中的地化学循环.
科学领域:
- 地质化学
- 环境科学
- 冰层科学
背景情况:
- 在冷环境中的矿物和有机相互作用是了解融化过程中的铁流的关键.
- 在冰中溶解铁的机制尚不清楚.
- 冰作为一个独特的地化学反应器, 调解意想不到的反应.
研究的目的:
- 阐明结在铁氧化纳米颗粒 (α-FeOOH) 溶解中的作用.
- 研究结度和温度对铁溶解的影响.
- 了解盐度和冷解周期对铁的释放的影响.
主要方法:
- 在4天的时间内完成实验.
- 在冰微粒中的液态水口袋中研究反应.
- 控制温度,氧酸盐度和盐度的变化
主要成果:
- 在被冰封的液体水中释放出溶性铁.
- 在低至-30°C的温度下结纳米颗粒,酸盐和质子增强溶解.
- 在特定条件下,冰在-10°C时比液体水在4°C和25°C时具有更高的铁溶解;高盐度抑制溶解.
- 连续的冷解循环通过释放被困的氧酸盐增加了铁的溶解.
结论:
- 结通过结度在间歇水中显著促进氧化氧化铁的溶解.
- 溶解反应可以发生在零度以下的温度下,挑战以前的假设.
- 了解这些以冰为媒介的过程对于预测永久土和土壤的溶性铁流量至关重要.
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