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Dissolved Organic Matter Singlet Oxygen Quantum Yields: Evaluation Using Time-Resolved Singlet Oxygen Phosphorescence.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-03-02 , DOI: 10.1021/acs.est.9b07246
Sarah B Partanen 1 , Paul R Erickson 1 , Douglas E Latch 2 , Kyle J Moor 1 , Kristopher McNeill 1
Affiliation  

Singlet oxygen (1O2) generation quantum yields from chromophoric dissolved organic matter (CDOM) have been reported for many samples over the past 4 decades. Yet even for standardized isolates such as those from the International Humic Substance Society (IHSS), wide-ranging values exist in the literature. In this manuscript, time-resolved 1O2 phosphorescence was used to determine the 1O2 quantum yields (ΦΔ) of a variety of dissolved organic matter (DOM) isolates and natural waters. In general, the 1O2 quantum yield values in this study are in the middle, although below the median of the range of past reported values (e.g., for Suwannee River Natural Organic Matter IHSS isolate: 1.8% vs 0.23-2.89%). Notably, hydrophobic neutral fractions of DOM isolates were found to possess the highest 1O2 quantum yields, an interesting result given that these fractions are not retained in typical humic and fulvic acid isolation procedures that use XAD resins. The excitation wavelength dependence of 1O2 generation from CDOM was also examined, and an approximate linear decrease with longer excitation wavelength was observed. This work advances the understanding of CDOM photoprocesses, especially in relation to wavelength-dependent 1O2 production, which is valuable for assessing real-world environmental behavior.

中文翻译:

溶解的有机物单重态氧的量子产率:使用时间分辨的单重态氧发磷光的评估。

在过去的40年中,许多样品已报道了发色溶解有机物(CDOM)产生单重态氧(1O2)的量子产率。然而,即使对于诸如国际腐殖物质协会(IHSS)的标准化分离株,文献中也存在广泛的价值。在本手稿中,使用时间分辨的1O2磷光来确定各种溶解的有机物(DOM)分离物和天然水的1O2量子产率(ΦΔ)。通常,本研究中的1O2量子产率值处于中间水平,尽管低于过去报告的值范围的中值(例如,对于Suwannee河天然有机物IHSS分离物:1.8%对0.23-2.89%)。值得注意的是,发现DOM分离物的疏水性中性级分具有最高的1O2量子产率,鉴于这些馏分在使用XAD树脂的典型腐殖酸和黄腐酸分离程序中没有保留,因此得出了一个有趣的结果。还检查了由CDOM产生的1O2的激发波长依赖性,并且观察到随着激发波长的增加线性降低。这项工作提高了对CDOM光处理的理解,尤其是与波长相关的1O2产生有关的知识,这对于评估现实世界的环境行为非常有价值。
更新日期:2020-03-03
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