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数字投资评价：ARL各图书馆数字化特色馆藏的可持续性（执行摘要）

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图书情报工作动态 2013年第3期 15-16页

作者： Nancy L. Maron sarah pickle 朱曼曼(编译)

特藏资源一直以来都是图书馆的重要组成部分，为用户提供稀有资源和档案资源访问，并为收藏机构创造独特价值。研究型图书馆深知特藏资源的独特价值，并日趋重视数字化等工作，使其更易于用户使用。

关键词：图书馆数字化可持续性特色馆藏投资评价 ARL 摘要档案资源研究型图书馆

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Addition of Thiourea Host Monomer to Polymer Flocculants to Improve Selectivity of Phosphate Sorption

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Journal of Agricultural Chemistry and Environment 2020年第3期9卷 147-158页

作者： Timothy S. Goebel Kevin J. McInnes Scott A. Senseman Robert J. Lascano Alex M. Cullen Timothy J. Fuhrer sarah pickle Netochi O. Adeolokun Todd A. Davis USDA Wind Erosion and Water Conservation Unit Lubbock TX USA Department of Soil and Crop Sciences Texas A & M University College Station TX USA Department of Plant Sciences University of Tennessee Knoxville TN USA Department of Chemistry United States Air Force Academy USAF Academy Colorado Springs CO USA Department of Chemistry Radford University Radford VA USA Department of Chemistry Idaho State University Pocatello ID USA

Inorganic phosphate is a common nutrient that is applied as a fertilizer to both agricultural fields as well as urban settings such as private yards, public parks and other urban landscaping. While phosphate typically binds tightly to soil, movement of phosphate off of application sites can occur through soil erosion. The soil and its bound phosphate can then end up in surface waters such as rivers and lakes. Phosphate found in surface water bodies exists both as bound to the suspended clay as well as that free in solution. Elevated phosphate concentration in surface waters can lead to algal blooms and eutrophication. While the phosphate bound to clay in suspension in surface water bodies can be removed by commercially available polymer flocculants, the phosphate that is free in solution is more challenging as it is usually found in low concentrations and other anionic salts are generally present in higher concentrations. To remove phosphate from contaminated water systems, where other anions exist at higher concentrations, it is favorable to have a method of removal that is selective for phosphate. As a proof of principle, thiourea derivatized polymer flocculants were examined for the selective removal of phosphate in the presence of competing anions. The polymer flocculants exhibited selectivity for phosphate through hydrogen bonding and were effective at removing up to 43% of phosphate from simulated wastewater. Computational studies and 1H NMR were used to investigate the selectivity of the thiourea monomer for phosphate over competing anions such as chloride and sulfate.

关键词： Molecular Recognition Thiourea Polymers Flocculants Phosphate

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