Photochemical release of dissolved organic matter from particulate organic matter: Spectroscopic characteristics and disinfection by-product formation potential

Refractory Humic-like Substances: Tracking Environmental Impacts of Anthropogenic Groundwater Recharge

“…For surface water, those ratios were even 2 times larger than the DOC/POC ratios, probably because unsaturated organic matter in particles is likely to photodissolve into the water phase, as demonstrated in previous studies. 13,62 The hardness and bivalent cations like Mg 2+ and Ca 2+ are other factors affecting the DOM/POM ratios. 23 Groundwater has higher hardness than surface water, as shown in Table S2 (SI).…”

Spectral characteristics of soil dissolved organic matter under different vegetation types in sandy soil

“…C2(E x /E m ：265/496 nm)属于疏水性高分子类腐殖酸物质 [32] ，是由复杂分子结构的腐殖质产生， 通常来源于植物残体等的腐烂和降解产物 [41,42] ；C3(E x /E m ：200, 289/294 nm)属于类蛋白质样荧光 团 [43] ，由新鲜植物的凋落物产生 [44] 。由于发射波长与高分子量腐殖质类结构的数量呈正相关关 系，与 C1 相比，C2 组分具有较大的发射波长，因此 C2 组分具有更高的疏水性和更大的分子尺 寸，C2 可以被鉴定为一种高分子量的陆生源腐殖酸，广泛分布在湿地和森林土壤环境中 [30,31] ， 此结果与之前的研究结果相似 [41,45] 。 [19] ，因此，DOM 三种组分的 变化特征说明在沙生植物对沙地恢复的过程中， 植被凋落物和微生物降解产物为土壤腐殖质的产 生提供了重要来源，进一步加速土壤腐殖质化，提高了有机质与土壤碳储量，有效地促进土壤中 类腐殖酸和类富里酸的积累 [46] 。在不同的植被覆盖地，草地的类腐殖质组分(C1 和 C2)的比例仅 次于杨树区和油松区，是由于草本植物根系发达且主要密集于表层，根系分泌物和死亡的根系可 为微生物提供丰富的能源物质 [47] ，易促进土壤微生物生长 [48] ，从而有利于根系分解而生成腐殖 化物质稳定下来。除草地外的植被覆盖地中，不同的树种类型类腐殖质组分(C1 和 C2)的比例有…”

Source identification and characteristics of dissolved organic matter and disinfection by-product formation potential using EEM-PARAFAC in the Manas River, China

“…11,[21][22][23][24] For example, humic-like components identied by PARAFAC were linked to different sources of DOM (e.g., terrestrial and microbial) and were shown to have dissimilar treatability during water and waste treatment. 21,25,26 Some studies have indicated a high correlation between trihalomethane formation potential (THMsFP) and some PAR-AFAC components in natural aquatic environments 27,28 and in laboratory-scale water treatments. 29 In another study, ve EEM-PARAFAC components, including four terrestrially derived humic-like substances (C1, C2, C3, and C4) and one tryptophanlike substance (C5), were identied in the sub-alpine Lake Tiancai.…”