使用ESI-FT-ICR MS的铁氧化物吸附诱导的有机的分化分子表征
Yongcan Jiang1, Minli Guo2, Yinlong Shao3
1PowerChina Huadong Engineering Corporation Ltd., Hangzhou, Zhejiang Province 311122, China; Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, HangZhou, Zhejiang Province 310058, China.
Ecotoxicology and environmental safety
|August 27, 2024
概括
铁氧化物如铁酸盐和酸盐从湖泊沉积物中吸附有机 (OP),而铁酸盐的吸附率更高. 这会影响循环,特别是在条件波动的浅湖.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 分析化学 分析化学
背景情况:
- 有机 (OP) 与氧化铁的相互作用对循环至关重要.
- 浅湖经历氧化还原波动改变氧化铁的形式和OP吸附.
- 铁氧化物对OP分离的分子水平影响仍然不太清楚.
研究的目的:
- 为了研究GOETHITE和ferrihydrite吸附诱导的OP分化.
- 用先进的质谱学在分子尺度上分析OP吸附.
- 了解铁氧化物在OP生物地球化学循环中的作用.
主要方法:
- 电子喷雾电离与富里埃变换离子循环子子共振质谱学 (ESI-FT-ICR MS) 结合进行分子分析.
- 吸附实验使用水晶和无形铁与提取的沉积物.
- 动力分析和pH依赖的吸附研究.
主要成果:
- 铁和都有效地吸附了OP,在pH值较高时吸附率下降.
- 铁酸盐吸附的OP配方显著更多 (56.0%) 比哥酸盐 (26.4%).
- 富含不和碳化合物,CRAM,宁和碳水化合物的化合物被优先吸附;像脂质和蛋白质这样的低双键等效 (DBE) 化合物仍然存在溶液中.
结论:
- 铁化物比戈伊具有更大的OP吸附能力,影响水生系统中的OP命运.
- 吸附取决于pH值,并遵循伪二次动力学.
- 由DBE表示的分子特征决定了OP适合氧化铁吸附的性质,为循环提供了洞察力.
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