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Stoichiometry of Removal of Natural Organic Matter by Ion Exchange

机译：离子交换去除天然有机物的化学计量

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Five anion exchange resins, including a magnetic ion exchange (MIEX) resin, were evaluated for removal of Suwannee River Fulvic Acid (SRFA) in the presence of bicarbonate and chloride. The charge density of SRFA, obtained by potentiometric titration, was used to perform charge balances for ion exchange reactions involving SRFA, bicarbonate, and chloride under different solution conditions. The results clearly show the equivalence of SRFA uptake and chloride release by ion exchange. Although the structure of the anion exchange resins did not affect the stoichiometry of the reaction, the polyacrylic resins did exhibit greater removal of SRFA than the polystyrene resins. The hindered removal of SRFA by the polystyrene resins was hypothesized to be a result of size exclusion. The MIEX resin, which has a polyacrylic structure, performed similarly to the other polyacrylic resins. For the MIEX resin, the separation factor for SRFA over chloride was ～8 times greater than for bicarbonate over chloride. This work provides an improved understanding of the interactions between natural organic matter (NOM), inorganic anions, and anion exchange resins, and should result in more effective applications of ion exchange for the removal of NOM in the treatment of drinking water.
机译：在碳酸氢盐和氯化物的存在下，评估了五种阴离子交换树脂，包括磁性离子交换（MIEX）树脂，以除去Suwannee River富里酸（SRFA）。通过电位滴定法获得的SRFA的电荷密度用于在不同溶液条件下进行涉及SRFA，碳酸氢盐和氯离子的离子交换反应的电荷平衡。结果清楚地表明了离子交换作用对SRFA的吸收和氯离子的释放是等效的。尽管阴离子交换树脂的结构不影响反应的化学计量，但聚丙烯酸酯树脂的SRFA去除率确实比聚苯乙烯树脂高。聚苯乙烯树脂阻碍SRFA的去除被认为是尺寸排阻的结果。具有聚丙烯酸酯结构的MIEX树脂与其他聚丙烯酸酯树脂的性能相似。对于MIEX树脂，SRFA在氯化物上的分离系数约为碳酸氢盐在氯化物上的分离系数的约8倍。这项工作使人们对天然有机物（NOM），无机阴离子和阴离子交换树脂之间的相互作用有了更好的了解，并应导致离子交换更有效地应用于饮用水中NOM的去除。

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