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

来自地球Kasumigaura湖的水中溶解的有机物质（DOM），其流入河流，以及湖泊捕获区的其他多个DOM来源，利用长期生物降解试验和沉积吸附剂进入十个类别：水生人类物质（AHS）、羟基中性（HoN）、羟基酸（HiA）、基础（BaS）、羟基中性（HiN）和再循环AHS、HN、HiA、BaS和HiN。DOM-Fraction分布模式、三元组形成潜力（THMEP， μmol·mgC^<-1>）和DOM、AHS和羟基Fractions （HiF=HiA+BaS+HiN）的分子尺寸分布模式对样品的起源有明显的不同。AHS和HiA软件在研究的所有样本中找到了DOM中占主导地位的碎片。HiA在湖面上预览过AHS，在那里AHS比HiA在河上的水更便宜。AHS在森林溪流和肥沃的田野中占有很大的多数。R-DOM片段分布模式清楚地表明，主导性重复性DOM片段不是湖水中的HiA，而是在河水中的HiA中预先存在的地方。THMFP的高密度分子可以与湖水中的AHS相比较。HIF over AHS的重要性是THM precursor成为THMFP在concentration期间评估（μmol·L^<-1>）。所有的分子尺寸分布都展示了狭窄的尺寸范围和相对较低的分子重量。DOM、AHS和HiF的重量平均分子重量分别为780、960和610克摩尔^<-1>，尊重。

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.