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首页> 外文期刊>Soil Science Society of America Journal >Soil Organic Matter Clogs Mineral Pores: Evidence from 1H-NMR and N2 Adsorption
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Soil Organic Matter Clogs Mineral Pores: Evidence from 1H-NMR and N2 Adsorption

机译：土壤有机质阻塞矿物孔隙：1 H-NMR和N 2吸附的证据

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Recent N2 adsorption studies have suggested a ‘pore clogging’ effect on mineral soil phases caused by organic matter coatings. For methodological reasons, this pore clogging effect has been studied only after drying. Our hypothesis was that pore clogging is affected by drying of organic coatings. In our study, we used AlOOH, which has been equilibrated with dissolved organic matter (DOM) and polygalacturonic acid [PGA; (C6H8O6)n]. To test our hypothesis, we determined the porosity of moist and freeze-dried AlOOH samples. Freeze-dried samples were analyzed by N2 adsorption, moist samples by 1H-nuclear magnetic resonance (NMR). In addition, the samples were characterized by environmental scanning electron microscopy—energy dispersive x-ray spectroscopy (ESEM-EDX). Both, DOM and PGA significantly reduced specific surface area (SSABET) of AlOOH by 34 m2 g–1 (15%) and 77 m2 g–1 (36%). The reduction in SSABET normalized to the amount of C sorbed was 1.0 m2 mg–1 DOM-C and 5.9 m2 mg–1 PGA-C. Dissolved OM reduced the pore volume of micro- and small mesopores <3 nm whereas PGA also reduced the volume of larger pores. The 1H-NMR results of moist samples showed that PGA sorption reduced the amount of water in pores <4 nm. In addition, the pore size maximum of AlOOH increased by 150%. Polygalacturonic acid coatings created new interparticle pores of about 10- to 70-nm size that are not stable upon freeze-drying. Porosity changes upon DOM-treatment were not commensurable by 1H-NMR. Our results indicate that clogging of micro- and small mesopores is not an artifact of freeze-drying. Polygalacturonic acid seems not only to cover the mouth of AlOOH-nanometer pores but also to fill them.
机译：最近的N 2 吸附研究表明，由有机物涂层引起的对矿物土壤相的“孔堵塞” 效应。 出于方法上的原因，该孔隙仅在干燥后才研究堵塞效果。我们的假设是孔堵塞 受有机涂层干燥的影响。在我们的研究中，我们 使用了AlOOH，它已经与溶解的有机物（DOM）和聚半乳糖醛酸[PGA; （C 6 H 8 O 6 ） n ]。为了 检验我们的假设，我们确定了潮湿和 冻干的AlOOH样品的孔隙率。冷冻干燥的样品通过N 2 吸附进行分析 ，湿润的样品通过 1 H核磁共振 （NMR ）。此外，样品还通过环境扫描电子显微镜-能量色散X射线光谱法（ESEM-EDX）进行了表征。 DOM和PGA都将AlOOH的比表面积（SSA BET ）显着降低了34 m 2 g -1 （15％）和 77 m 2 g –1 （36％）。标准化为 的C吸附量的SSA BET 减少为1.0 m 2 mg –1 DOM-C和5.9 m 2 mg –1 PGA-C。溶解的OM减少了micro- 和<3 nm的小中孔的孔体积，而PGA也减小了大孔的体积。潮湿样品的 1 H-NMR结果显示 PGA吸附减少了<4 nm孔中的水量。此外，AlOOH的最大孔径增加了 150％。聚半乳糖醛酸涂层产生了约10-70 nm的新的颗粒间 孔，这些孔在冷冻干燥后不稳定。 DOM处理后的孔隙率变化不能用< sup> 1 1 H-NMR。我们的结果表明， 细孔和小孔的堵塞不是冷冻干燥的产物。聚半乳糖醛酸 酸似乎不仅可以覆盖AlOOH纳米孔的口 ，而且可以填充它们。

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    《Soil Science Society of America Journal》 |2004年第6期|1853-1862|共10页
  • 作者

    Christian Mikutta; Friederike Lang; Martin Kaupenjohann;

  • 作者单位

    Dep. of Soil Science, Institute of Ecology, Berlin Univ. of Technology, Salzufer 11-12, D-10587 Berlin, Germany;

    Dep. of Soil Science, Institute of Ecology, Berlin Univ. of Technology, Salzufer 11-12, D-10587 Berlin, Germany;

    Dep. of Soil Science, Institute of Ecology, Berlin Univ. of Technology, Salzufer 11-12, D-10587 Berlin, Germany;

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