冰体融化过程中三线态溶解性有机物的释放规律
RELEASE LAW OF TRIPLET STATES OF DISSOLVED ORGANIC MATTER DURING ICE MELTING PROCESS
李旭 1薛爽 1于英潭 1姜彩虹 1刘强1
作者信息
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.
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.
关键词
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Key words
triplet states of dissolved organic matter/2,4,6-trimethylphenol(TMP)/three-dimensional excitation emission matrix fluorescence spectra/spectroscopic characteristic parameters/ice melting引用本文复制引用
出版年
2024
NETL
NSTL
万方数据