冰体融化过程中三线态溶解性有机物的释放规律

李旭; 薛爽; 于英潭; 姜彩虹; 刘强

doi:10.13205/j.hjgc.202403005

冰体融化过程中三线态溶解性有机物的释放规律

doi: 10.13205/j.hjgc.202403005

辽宁大学环境学院, 沈阳 110036

基金项目:

国家自然科学基金项目(41771503)

详细信息

作者简介:
李旭(1997-),女,硕士研究生,主要研究方向为低温条件下污染物的环境行为。2514299948@qq.com

通讯作者:
薛爽(1977-),女,博士,教授,主要研究方向为低温条件下污染物的环境行为。xueshuang666@sina.com

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出版历程
- 收稿日期: 2023-02-08
- 网络出版日期: 2024-05-31

RELEASE LAW OF TRIPLET STATES OF DISSOLVED ORGANIC MATTER DURING ICE MELTING PROCESS

School of Environmental Science, Liaoning University, Shenyang 110036, China

摘要

摘要: 以辽宁省沈阳市的浑河河水(HR)和丁香湖湖水(DXL)作为研究对象,通过淋溶实验和室内模拟光解实验,选用2,4,6-三甲基苯酚(TMP)作为三线态溶解性有机物(³DOM^*)的探针,考察了不同温度条件下冰体融化时溶解性有机物(DOM)的光谱学特性变化,以及DOM、荧光物质和³DOM^*的释放规律。结果表明:融化温度越低,HR与DXL 2种水样的SUVA₂₅₄、E₂/E₃均显著增加,且DXL水样表现出的增加更为明显。HR和DXL水样中均包含类富里酸类物质、类腐植酸类物质,HR样品中还含有类芳香族蛋白类物质。冻结温度相同,融化温度越低,荧光物质从样品中析出得越规律,呈逐渐减少的趋势。融化温度越低,³DOM^*的释放越规律,且HR表现得尤为明显,HR融化初期³DOM^*的稳态浓度是原始水样的4.1倍。
- 三线态溶解性有机物 /
- 2,4,6-三甲基苯酚(TMP) /
- 三维荧光光谱 /
- 光谱学特性参数 /
- 冰体融化
Abstract: The water of Hun River (HR) and Dingxiang Lake (DXL) in Shenyang City, Liaoning Province was selected as the research objects, the changes in spectral properties of dissolved organic matter (DOM), as well as the release of DOM, fluorescent matter, and the triplet states of dissolved organic matter (³DOM^*) during ice melting process at different temperatures were investigated in this study. The leaching experiments and laboratory simulation photolysis experiments were conducted, and 2, 4, 6-trimethylphenol (TMP) was selected as the probe of ³DOM^*. The results showed that the lower the melting temperature, the SUVA₂₅₄, E₂/E₃ of the two water samples increased significantly, and the increase of DXL was more obvious. HR and DXL samples both contain fulvic acid and humic acid substances, and HR samples also contain aromatic protein substances. With the same freezing temperature, the lower the melting temperature, the more regular the precipitation of fluorescent substances from the sample, showing a gradually decreasing trend. The lower the melting temperature, the more regular the release of ³DOM^*, which was particularly obvious for HR. The steady-state concentration of ³DOM^* at the initial melting stage of HR was 4.1 times that of the original water sample.

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