DOM Molecular Weight Fractionation and Fluorescence Quantum Yield Assessment Using a Coupled In-Line SEC Optical Property System

DOM Molecular Weight Fractionation and Fluorescence Quantum Yield Assessment Using a Coupled In-Line SEC Optical Property System
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使用耦合在线 SEC 光学特性系统进行 DOM 分子量分级和荧光量子产率评估

DOI:
10.1021/acsestwater.2c00318
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发表时间:
2022
期刊:
ACS ES&T Water
影响因子:
--
通讯作者:
Rosario-Ortiz, Fernando L.
Rosario-Ortiz, Fernando L.
中科院分区:
--
文献类型:
--
作者:
Hanson, Blair;Wünsch, Urban;Buckley, Shelby;Fischer, Sarah;Leresche, Frank;Murphy, Kathleen;D’Andrilli, Juliana;Rosario-Ortiz, Fernando L.

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尺寸排阻色谱 (SEC) 与光学测量相结合已成为一种流行的分析形式,用于将溶解有机物 (DOM) 表征为分子大小的函数。这里,SEC 与在线吸光度扫描和荧光发射扫描相结合,用于导出表观荧光量子产率 (Φf),作为 DOM 分子量 (MW) 的函数。通过将基于 SEC 的激发发射矩阵 (EEM) 与校准台式荧光计生成的 EEM 进行比较,开发了各个仪器特定的 SEC 荧光检测器校正因子。然后将该方法应用于多个样品组,以演示如何测量未知 DOM 样品的 Φf 并观察处理机制(臭氧化)后 Φf 的变化。在中低MW范围内,Φfof河流水样和来自Suwannee河和Pony湖的DOM黄腐酸分离物从<0.5%增加到最大值~2.5-3%。 PLFA 臭氧化后,大分子量级分(洗脱体积 < 40 mL)中的 Φfin 增加最为显着。总体而言,该方法提供了一种方法,可以识别 DOM 的高荧光尺寸部分,以便更详细地分析化学成分及其通过不同处理机制的变化。
Size exclusion chromatography (SEC) in combination with optical measurements has become a popular form of analysis to characterize dissolved organic matter (DOM) as a function of molecular size. Here, SEC coupled with in-line absorbance scans and fluorescence emission scans was utilized to derive apparent fluorescence quantum yield (Φf) as a function of molecular weight (MW) for DOM. Individual instrument-specific SEC-fluorescence detector correction factors were developed by comparison of an SEC-based excitation emission matrix (EEM) to an EEM generated by a calibrated benchtop fluorometer. The method was then applied to several sample sets to demonstrate how to measure the Φfof unknown DOM samples and to observe changes to Φffollowing a processing mechanism (ozonation). The Φfof riverine water samples and DOM fulvic acid isolates from Suwannee River and Pony Lake increased from < 0.5% to a maximum of ∼2.5–3% across the medium- to low-MW range. Following ozonation of PLFA, Φfincreased most notably in the large-MW fractions (elution volumes < 40 mL). Overall, this method provides a means by which highly fluorescent size fractions of DOM can be identified for more detailed analyses of chemical composition and its changes through different processing mechanisms.
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