Seasonal hydrological change shaping the relationship between dissolved organic matter and land use in the middle reaches of the Yangtze river

Liao, J.; Huang, Q. H.; Liu, G. N.; Wang, N. T.; Qiu, Z. P.; Hu, Chen; Spencer, Robert G. M.

doi:10.1007/s10533-023-01035-w

Cited by 3 publications

(1 citation statement)

References 65 publications

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“…The instrument parameters were set as follows: an integration time of 0.5 s, an excitation wavelength measurement range of 240-600 nm with a step size of 3 nm, and an emission wavelength measurement range of 246-824 nm with a step size of 3 nm. To eliminate instrument-specific biases, inner-filter effect correction was applied to each data matrix, and the in situ data processing software of Aqualog V3.6 was utilized for Rayleigh scatter correction [60,61].…”

Section: Sample Analysismentioning

confidence: 99%

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

He,

Li,

et al. 2024

Water

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Understanding the hydrological processes of dissolved organic matter (DOM) in the surface karst zone is crucial for the utilization and safety of groundwater resources. However, research on DOM in drip water from karst caves is limited. In this study, continuous monitoring was conducted for four years at four drip water monitoring sites (MP1, MP2, MP3, and MP9) in Furong Cave, Southwest China. The three-dimensional fluorescence excitation–emission spectroscopy (3D-EEM) and fluorescence region integration (FRI) methods were employed, along with correlation analysis, to investigate the spectral characteristics, composition, sources, and influencing factors of the DOM in the drip water of Furong Cave. The results indicated that (1) the three-dimensional fluorescence peaks in the drip water were classified into six categories: A, B, C, T, Ti, and M. (2) The dominant source of the drip water DOM is endogenous organic matter. (3) The FRI analysis indicates a relatively high proportion of Type II substances in the drip water, predominantly composed of tryptophan-like substances. (4) The DOM in the drip water of Furong Cave was influenced by various factors, including the mixing effect of “new” and “old” water, water residence time in karst systems, and water–rock interactions (WRI), resulting in the complex responses of drip rates and DOM to surface precipitation and temperature at different drip water sites. This study provides a reference for comparative research on DOM in cave drip water in karst regions, which contributes to a better understanding of the migration mechanism of DOM in karst aquifers under different climate and karst ecological conditions.

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Section: Sample Analysismentioning

confidence: 99%

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

He,

Li,

et al. 2024

Water

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Tracing fluorescent dissolved organic matter (fDOM) characteristics and water quality parameters: Insights from an urban industrial river to marine zone

Sakib,

Miah,

Niloy

et al. 2024

Water Environment Research

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This study aims to identify continuous water quality changes and identify fluorescence properties from urban rivers to marine zones. Various types of natural and anthropogenic sources derived dissolved organic matter (DOM) have been identified in this study. These include soil‐derived DOM, plant remnants, and soluble particles produced when organic material partially decomposes and is released by microorganisms, such as bacteria, algae, and plants. DOM was characterized using a three‐dimensional excitation–emission matrix (3DEEM), parallel factor analysis (PARAFAC), and water quality parameters from the Buriganga River, Dhaka to Patenga Seaport, Chittagong, along with the Shitalakshya River, a small portion of the Padma River, and the Meghna River. To better understand the data analysis, the study area was divided into three central regions: urban industrial rivers, industrial estuarine rivers, and marine zones. In the urban industrial river, 3DEEM and PARAFAC identified five fluorophores (peaks: A, C, M, T, and Tuv) with five components: detergent‐like, fulvic‐like, tryptophan or protein‐like, fulvic‐like (C‐type), and protein‐like, which might originate from the industrial activities and sewage pollution. In the industrial estuarine river zone, three fluorophores have been identified (peaks: A, C, Tuv) with two known components, namely, fulvic acid (A‐type) and fulvic acid (C‐type), with an unknown photoproduct at Ex/Em = 295/368 (peak Tuv). Components in the industrial river zone may originate from terrestrial sources, indicating vegetation along the river. In the marine zone, four fluorophores have been identified (peaks: Tuv, A, T, C) with two components, that is, protein‐ or tryptophan‐like and humic acid‐like from coral origin. The intensities of both fulvic‐like and protein‐like substances were high in urban industrial river water owing to industrial activity and sewage pollution. SUVA254 suggests high aromaticity in all three regions, whereas the optical properties suggest that terrestrial and microbial components are present in the urban industrial and estuarine rivers. This further indicates that urban industrial river water quality is highly polluted. The lowest degradation potential index (DPI) in the marine zone might result from the presence of the highest number of dissolved solids in the water, and the highest DPI of industrial estuarine rivers explains the comparatively high presence of terrestrial‐derived humic (A)‐ and humic (C)‐like components in the ratio to the unknown photoproduct of mid‐wavelength.Practitioner Points This study's uniqueness is a 220‐km cruise from an urban river to a coastal seaport to analyze fluorescence properties. The study found that most water parameters were within the DoE standards, except for DO, which was consistently low. 3DEEM‐PARAFAC identified five fluorophores linked to detergent, fulvic, and protein‐like substances from sewage and industrial sources. Our study concludes that microbial and terrestrial sources dominate dissolved organic matter in urban, estuarine, and marine regions.

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In-reservoir transformation of dissolved organic matter as a function of hydrological flow

Imtiazy,

Hunter,

Hudson

2024

Journal of Environmental Management

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Seasonal hydrological change shaping the relationship between dissolved organic matter and land use in the middle reaches of the Yangtze river

Cited by 3 publications

References 65 publications

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

Tracing fluorescent dissolved organic matter (fDOM) characteristics and water quality parameters: Insights from an urban industrial river to marine zone

In-reservoir transformation of dissolved organic matter as a function of hydrological flow

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