• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Soil Science Society of America Journal >Increased Stability of Organic Matter Sorbed to Ferrihydrite and Goethite on Aging
【24h】

Increased Stability of Organic Matter Sorbed to Ferrihydrite and Goethite on Aging

机译：老化时吸附到三水铁矿和针铁矿上的有机物的稳定性增加

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sorption to micro- and mesoporous mineral phases can stabilize organic matter (OM) against microbial decay in soil. Formation of strong bonds that reduce desorbability is one plausible explanation for that effect. With time after sorption, sorbed OM may undergo changes in configuration or may migrate into intraparticle spaces. We tested the possible effects of residence time of OM sorbed to ferrihydrite and goethite. The minerals were loaded with different amounts of water-soluble OM from an Oa horizon, then stored moist (10% w/w water) for up to 1080 d at 4°C. We monitored the content of organic C, the desorbability and chemical stability (by extraction with 0.1 M NaOH–0.4 M NaF and treatment with 1 M NaOCl), and, after freeze-drying, the micro- and mesopore volume (by N2 and CO2 adsorption–desorption). Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was used to characterize the OM on the mineral surfaces at the beginning and end of the experiment. There was no detectable decrease in sorbed organic C during the experiment; also, the micro- and mesoporosity of the samples remained unchanged. The proportion of desorbable organic C, however, decreased by up to 16%. This was paralleled by more pronounced bands indicative of complexed organic functional groups in the DRIFT spectra. We conclude that with increasing residence time, OM sorbed to porous minerals becomes decreasingly desorbable by the formation of additional chemical bonds to the surface via ligand exchange but not by diffusion into small pores. The decrease in desorbability was accompanied by a decrease in chemical destructibility with NaOCl. The stability of sorbed OM against biological degradation may similarly increase with residence time.
机译：对微孔和中孔矿物相的吸附可以稳定 有机物（OM），防止土壤中微生物的腐烂。降低解吸性的强键的形成 是对该效果的一种合理解释。随着吸附时间的延长，被吸附的OM可能会发生 构型变化或可能迁移到颗粒内部空间。 我们测试了OM吸附的s 至水铁矿和针铁矿。从Oa地平线向矿物质中加载 不同量的水溶性OM，然后在4° 储存的湿气（10％w / w的水）中存储长达1080 d C。我们 监测有机碳的含量，解吸性和化学稳定性（通过用0.1 M NaOH–0.4 M NaF萃取和 用1 M处理）进行监测。 NaOCl），然后冷冻干燥后，微量 和中孔体积（通过N 2 和CO 2 吸附-解吸）。 sup> 漫反射红外傅里叶变换（DRIFT）光谱 用于表征 开始和实验结束时矿物表面的OM。实验期间，吸附的有机碳没有检测到 减少；同样，样品的 介孔率和微孔率保持不变。但是，可解吸有机碳的 比例下降了 到16％。这与DRIFT光谱中更明显的指示复合有机官能团的 带平行。 我们得出结论，随着停留时间的增加，OM吸附到 通过配体交换 到表面上的其他化学键形成 ，多孔矿物质变得越来越难解吸，但不能扩散到小孔中。脱附性 的降低伴随着 NaOCl的化学破坏性的降低。吸附的OM对生物降解的稳定性 可能随着停留时间的增加而增加。

著录项

  • 来源
    《Soil Science Society of America Journal》 |2007年第3期|711-719|共9页
  • 作者

    K. Kaiser; R. Mikutta; G. Guggenberger;

  • 作者单位

    Soil Sciences, Martin Luther Univ. Halle-Wittenberg, Weidenplan 14, 06108 Halle (Saale), Germany;

    Soil Sciences, Martin Luther Univ. Halle-Wittenberg, Weidenplan 14, 06108 Halle (Saale), Germany;

    Soil Sciences, Martin Luther Univ. Halle-Wittenberg, Weidenplan 14, 06108 Halle (Saale), Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号