Relevance of tributary inflows for driving molecular composition of dissolved organic matter (DOM) in a regulated river system

Acharya, Suman; Holland, Aleicia; Rees, Gavin N.; Brooks, Andrew J.; Coleman, Daniel; Hepplewhite, C. L.; Mika, Sarah; Bond, Nick; Silvester, Ewen

doi:10.1016/j.watres.2023.119975

Cited by 7 publications

(2 citation statements)

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“…TOC peaked in the summer at 3.4 mg/L, possibly due to the influx of particulate organic matter from heavy rainfall during the monsoon season (≥85% of the annual precipitation) accompanied by increased In PD, BOD was the highest in spring at 1.9 mg/L, presumably attributable to the rapid increase in algal biomass due to abundant nutrients [31]. TOC peaked in the summer at 3.4 mg/L, possibly due to the influx of particulate organic matter from heavy rainfall during the monsoon season (≥85% of the annual precipitation) accompanied by increased turbidity [32]. The T-N and T-P concentrations mainly increased under the influence of sewage discharge or non-point source pollution, contributing to a slight nutrient increase in the PD post-rainfall [33,34].…”

Section: Water Quality Characteristics Of the Paldang Watershedmentioning

confidence: 99%

“…Between June and July, high contributions were observed from HS (48.9%) and BB (42.0%), factors of nonbiodegradable organic matter, possibly due to the impact of the organic matter originating from humic substances caused by substantial rainfall exceeding 100 mm/event, as shown in the HSdiagram. In July and August, LMWN had the highest contribution of 71.2%, presumably because of the influx of organic materials rich in LMWN or the decomposition of particulate organic matter after entering the water system [32,56].…”

Section: Correlation Analysis and Principal Component Analysismentioning

confidence: 99%

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Evaluation of Organic Matter Contribution Using Absorbance and Chromatographic Parameters in Lake Paldang, Republic of Korea

Cho,

Seong,

Byeon

et al. 2023

Agronomy

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Organic matter in lakes is categorized into allochthonous organic matter, such as leaves and sewage effluent, and autochthonous organic matter, generated by microorganisms within the water system. In this study, organic matter composition was analyzed using UV-vis spectroscopy and liquid chromatography-organic carbon detection (LC-OCD). Several allochthonous natural organic matter substances were collected including leaves, green leaves, forest soils, and paddy soils. The organic matter composition analysis in our study sites revealed that humic substances comprised the highest proportion (36.5–42.3%). Also, individual samples at each site exhibited distinct characteristics. This study used a humic substance-diagram (HS-diagram) and principal component analysis (PCA) to trace the sources affecting the river water quality and identify their origins. The humic substances of soil origin predominantly influenced the water quality, with the impact of organic matter significantly pronounced during the July rainfall period. Compared with the PCA results, the contribution of the humic substance (HS, 48.9%) and building block (BB, 42.0%) indices appeared higher between June and July in summer, likely due to non-degradable substances released by heavy rain. In fall, the contribution of low molecular weight neutrals increased from 71.2% to 85.2%, owing to a humic substance influx and decomposition. This study demonstrated the application of estimating the relative contributions of source materials in lakes utilized for drinking and agricultural water to identify sources, aiding in the development of efficient watershed management plans.

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