Effect of cleaning methods on the dissolution of diatom frustules
Effect of cleaning methods on the dissolution of diatom frustules
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清洗方法对硅藻壳溶解的影响
DOI：
10.1016/j.marchem.2020.103826
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发表时间：
2020
期刊：
影响因子：
3
通讯作者：
Tang, Yuanzhi
中科院分区：
文献类型：
--
作者：
Saad, Emily M.;Pickering, Rebecca A.;Shoji, Kanaha;Hossain, Mohammad I.;Glover, T. Grant;Krause, Jeffrey W.;Tang, Yuanzhi
表征硅质材料的反应性的实验研究，例如来自野外或实验室培养物的生物二氧化硅，通常需要在实验分析之前去除有机物质。因此，非常需要开发和优化对硅质基材的反应性施加最小改变并且可以在实验室和研究者中稳健地采用的清洁方案。本研究提供了一个定量比较的几种方法去除有机物与生物二氧化硅，以评估其有效性用于反应性研究。评估了五种去除有机物的方案，包括化学处理和/或烘烤的组合，沿着用氧等离子体进行低温灰化。这些方法进行了测试和评价，使用海链藻细胞壳的质量回收，有机碳去除，元素组成，形态，结构顺序，相对丰度的硅烷醇（Si-OH）基团，和溶解速率。使用海链藻和更真实的海水基质在更长的时间尺度上进行了额外的实验。低温等离子体灰化被认为是最适合的有机物去除的研究中寻求限制生物二氧化硅的短期溶解;这种方法有效地去除有机碳，同时是最小的影响硅藻溶解相比，其他清洁方法评估。然而，如果实验的调查路线不需要了解短期溶解速率，则常用的化学品（例如无机酸、过氧化物）和高温处理似乎不会影响生物二氧化硅溶解的长期轨迹。
Experimental studies characterizing the reactivity of siliceous materials, such as biogenic silica from the field or laboratory cultures, typically require organic matter removal prior to experimental analysis. Consequently, it is highly desired to develop and optimize a cleaning protocol that imposes minimal alterations to the reactivity of the siliceous substrate and can be robustly employed among laboratories and investigators. This study offers a quantitative comparison of several methods for removing organic matter associated with biogenic silica to assess their efficacy for use in reactivity studies. Five protocols for organic matter removal were assessed, including combinations of chemical treatments and/or baking, along with low temperature ashing with an oxygen plasma. These methods were tested and evaluated using Thalassiosira pseudonana frustules for mass recovery, organic carbon removal, elemental composition, morphology, structural order, relative abundance of silanol (≡Si-OH) groups, and dissolution rate. An additional experiment was conducted over a longer time scale usingThalassiosira weissflogiiand a more realistic seawater matrix. Low temperature plasma ashing was found to be the most suitable for organic matter removal in studies seeking to constrain the short-term dissolution of biogenic silica; this method efficiently removed organic carbon while being the least impactful on frustule dissolution compared to the other cleaning methods evaluated. However, if the line of inquiry for an experiment does not require understanding of short-term dissolution rates, commonly used chemical (e.g. mineral acid, peroxide) and high temperature treatments did not appear to affect the long-term trajectory in biogenic silica dissolution.
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DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
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DOI：
10.1016/j.dsr2.2010.08.007
发表时间：
2011
影响因子：
3
作者：
Mark S. Demarest;M. Brzezinski;D. M. Nelson;J. Krause;Janice L. Jones;C. Beucher
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S. Loucaides;T. Behrends;P. Cappellen
影响因子：
2.3
作者：
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通讯作者：
J. Krause;Elizabeth S. Darrow;R. Pickering;R. Carmichael;Ashley M. Larson;Jose L. Basaldua