Dynamics and trihalomethane formation potential of recalcitrant dissolved organic matter in lake water

湖水中难溶解有机物的动态和三卤甲烷形成潜力

• 批准号: 12450215
• 负责人: IMAI Akio
• 金额: $ 7.17万
• 依托单位: National Institute for Environmental Studies
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450215/
• 关键词: dissolved organic matter (DOM); recalcitrant DOM; lake water; trihalomethane formation potential; aquatic humic substances; hydrophilic DOM; river water; molecular weight; 離分解性溶存有機物; 難分解性有機物; トリハロナタン生成能; 親水性有機物

Dissolved organic matter (DOM) in water from eutrophic Lake Kasumigaura, its inflowing rivers, and several other DOM sources in the lake catchment area was fractionated using a long-term biodegradation test and resin adsorbents into ten classes: aquatic humic substances (AHS), hydrophobic neutrals (HoN), hydrophilic acids (HiA), bases (BaS), hydrophilic neutrals (HiN), and recalcitrant AHS, HoN, HiA, BaS, and HiN. The DOM-fraction distribution pattern, the trihalomethane formation potential (THMEP, μmol・mgC^<-1>) and molecular size distribution of the DOM, AHS and the hydrophilic fractions (HiF=HiA+BaS+HiN) were evaluated.DOM-fraction distribution patterns were significantly different depending on the origin of the sample. AHS and HiA ware found to be the dominant fractious in DOM in all samples studied. HiA prevailed over AHS in the lake water, whereas AHS were slightly more abundant than HiA in the river waters. AHS were in the great majority in forest streams and plowed-field percolates. R-DOM fraction distribution patterns clearly indicated that the dominant recalcitrant DOM fraction is HiA not AHS in the lake water, whereas AHS prevailed over HiA in the river-water R-DOM. The THMFP of HiF was found to be comparable to that of AHS in the lake water. The importance of HiF over AHS as a THM precursor became pronounced when THMFP was evaluated in terms of concentration (μmol・L^<-1>). Molecular size distributions all exhibited a narrow size range and relatively low molecular weights. The weight-averaged molecular weights of DOM, AHS and HiF were 780, 960 and 610 g-mole^<-1>, respectively.

通过长期生物降解试验和树脂吸附剂，将来自富营养化霞浦湖、其流入河流以及湖流域其他几个 DOM 源的水中溶解有机物 (DOM) 分为十类：水生腐殖质 (AHS)、水生腐殖质 (AHS)、疏水性中性物质 (HoN)、亲水性酸 (HiA)、碱 (BaS)、亲水性中性物质 (HiN) 和顽固性 AHS， HoN、HiA、BaS 和 HiN 的 DOM 级分分布模式、三卤甲烷形成电位 (THMEP、μmol·mgC^<-1>) 以及 DOM、AHS 和亲水级分 (HiF=HiA+ BaS) 的分子尺寸分布。 +HiN) 进行了评估。DOM 分数分布模式根据样品的来源而显着不同，并且发现 AHS 和 HiA 制品是所有 DOM 中的主要易怒物质。研究样本显示，湖水中的 HiA 含量高于 AHS，而森林溪流中的 AHS 含量略多于 HiA，而犁过的田地渗滤液中的 AHS 含量明显较高。湖水中的主要顽固性 DOM 分数是 HiA，而不是 AHS，而河水 R-DOM 中，AHS 优于 HiA。发现 HiF 的 THMFP 与湖水中的 AHS 相当。当以浓度（μmol·L^<-1>）评估THMFP时，HiF相对于AHS的重要性变得明显。 DOM、AHS和HiF的平均分子量分别为780、960和610克-摩尔^ -1 。