Roles of dissolved organic matter (DOM) in shaping the distribution pattern of heavy metal in the Yangtze River

Liang, Enhang; Li, Jiarui; Li, Bin; Liu, Shufeng; Ma, Ruoqi; Yang, Shanqing; Cai, Hetong; Xue, Zehuan; Wang, Ting

doi:10.1016/j.jhazmat.2023.132410

Cited by 26 publications

(5 citation statements)

References 70 publications

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“…McIntyre and Guéguen [41] and Fan et al [41] determined microbial humic-like (UVA) fluorescence C1 (Ex/Em: 255(340)/455 nm) and C1 (Ex/Em: 320/400 nm) in aquatic environments in Canada and China, respectively. Tang et al [43] and Liang et al [44] reported terrestrial humic-like (UVC) fluorescence (C3) Ex/Em: 288 (466)/517 nm and (C3) Ex/Em: 300 (420)/520 nm,. The abundance of humic-like substances in source water could be due to terrestrial/soil organic matter, microbial humification, vegetation/forest cover, agricultural activities, deep water percolation, and soil erosion [86][87][88].…”

Section: Discussionmentioning

confidence: 99%

Novel Implications of the PARAFAC Model for Characterizing and Distributing DOM in Groundwater Networks by Using Spectroscopic Techniques

Alhaj Hamoud,

Maqsood,

Zia-ur-Rehman

et al. 2024

Water

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Groundwater, a primary source of freshwater on Earth, is rapidly declining due to natural and anthropogenic activities. This study aimed to investigate the spatial distribution of dissolved organic matter (DOM) and heavy metals (HMs) in two municipal groundwater networks (A and B) from tube wells to taps in an industrial city, Faisalabad. The results showed that parameters such as color, turbidity, pH, EC, TDS, Ca2+, Mg2+, CO32−, HCO3−, Cl−, CaCO3, Na+, and NO3− were within the permissible limits set by the World Health Organization (WHO) and Pakistan Environmental Quality Standards (PEQSs). However, parameters like DO and COD exceeded standard values along the routes. Odor, taste, temperature, BOD, NH4+, T. coli, and F. coli surpassed acceptable levels at the tap end of both networks. Fluorescence EEM-PARAFAC spectra were analyzed at an excitation wavelength of 220–500 nm and emission wavelength of 240–550 nm, revealing UVA-humic-like (C1–C2) and UVC-humic-like (C3) components in the DOM. Based on fluorescence intensity, DOM was dominated by C2 > C1 > C3 compounds in both networks. The mean concentrations of HMs, including Cu, Zn, and Fe, fell below the prescribed limits in both networks. However, concentrations of Pb (A: 0.015–0.028 mg/L), (B: 0.013–0.027 mg/L), and Cd (A: 0.004–0.006 mg/L), (B: 0.005–0.008 mg/L) exceeded permissible limits from tube wells to taps. Moreover, C1 demonstrated a significant positive correlation with Cd and Cu in networks A and B, respectively. Furthermore, C2 displayed a significant positive correlation with Cd in network A. This study concludes that the groundwater in both networks (A and B) is contaminated by agricultural runoff, industrial and sewage water, plumbing materials, and eroded pipelines. As a result, the water is unsafe for cooking and drinking, posing risks of kidney, lung, and bladder cancers. Therefore, this study urgently recommends pipeline reconstruction and the implementation of proper groundwater remediation approaches before these sources are used for drinking.

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Section: Discussionmentioning

confidence: 99%

Novel Implications of the PARAFAC Model for Characterizing and Distributing DOM in Groundwater Networks by Using Spectroscopic Techniques

Alhaj Hamoud,

Maqsood,

Zia-ur-Rehman

et al. 2024

Water

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“…Importantly, the humic-like components C1, C3 and C4 and the microbial humic-like component C5 showed higher variation. The high variability of DOM components suggested that the DOM components in peri-urban rivers underwent more rapid production and consumption than those in urban rivers, including microbial production and consumption, chemical action and photodegradation. ,, For example, the protein-like component C5 has greater biodegradability and greater resistance to photodegradation than terrestrial humic-like matter C1 . Short links between arrow vertices of C2/C3 and C1/C4 components indicated that their ratios were relatively constant throughout urban and peri-urban rivers.…”

Section: Discussionmentioning

confidence: 99%

“…However, heavy metals, not water properties, are directly contribute to the variance and transformation of DOM components. This can be explained by the fact that heavy metal enrichment can reduce microbial enzyme (e.g., β- d -glucosidase and FDAase) activities and thus decrease the ability of microbes to metabolize carbon sources (e.g., leaf litter). , Additionally, high-aromaticity and high-molecular-weight DOM exhibit a high binding capacity with heavy metals (e.g., As, Cd and Ni), affecting DOM bioavailability.…”

Section: Discussionmentioning

confidence: 99%

“…The concentrations of As, Cr, Ni and Zn in many of the tested rivers exceeded the limits established by the World Health Organization (WHO) and the United States Environmental Protection Agency (USEPA) . In addition, As, Zn and Cr strongly interacted with DOM in the rivers . Thus, four heavy metals (As, Ni, Cr and Zn) were chosen for detailed analysis.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Using the Potential Transformation of Dissolved Organic Matter to Understand Carbon Emissions from Inland Rivers

Qu,

Hu,

Feng

2024

Environ. Sci. Technol.

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Understanding the transformation of river dissolved organic matter (DOM) is important for assessing the emissions of greenhouse gases (GHGs) in inland waters. However, the relationships between the variations in DOM components and GHGs remain largely unknown. Here, parallel factor analysis (PARAFAC) was applied to investigate the DOM components in 46 inland rivers in China. We found that the GHG emissions in peri-urban rivers were 1.10−2.15 times greater than those in urban rivers. Microbial and environmental factors (e.g., living cell numbers, microbial activity and pH) explained more than 70% of the total variance in GHG emissions in rivers. DOM variations relationships between different components ware revealed based on compositional data principal component analysis (CoDA-PCA). Microbial-mediated DOM production and degradation were quantified, and the degradation levels in periurban rivers were 11.8−25.2% greater than those in urban rivers. Differences in carbon emission potential between urban and peri-urban rivers were related to DOM variances and transformations and were affected by water chemistry (e.g., NH 4 −N and As). This study clarifies the regulatory effects of DOM composition variations and transformations on GHG emissions, and enhances the understanding of the DOM biogeochemical cycle.

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“…C1, characterized by an Ex/Em peak at 225/335 nm and 275/335 nm, was identified as a tryptophan-like component, indicating a simple, low-molecular-weight component prevalent in anthropogenically affected watersheds [32]. C2 exhibited an Ex/Em peak at 325/405 nm, classifying it as a humic-like component commonly found in agricultural environments [33]. The Ex/Em peak at 445/495 nm identified C3 as another humic-like component, previously observed in landfill environments [34].…”

Section: Variations In the Dom Fluorescence Componentsmentioning

confidence: 99%

Unraveling the Coupled Dynamics between DOM Transformation and Arsenic Mobilization in Aquifer Systems during Microbial Sulfate Reduction: Evidence from Sediment Incubation Experiment

Du,

Li,

Jiang

et al. 2024

Water

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Geogenic arsenic (As)-rich groundwater poses a significant environmental challenge worldwide, yet our understanding of the interplay between dissolved organic matter (DOM) transformation and arsenic mobilization during microbial sulfate reduction remains limited. This study involved microcosm experiments using As-rich aquifer sediments from the Singe Tsangpo River basin (STR) and Jianghan Plain (JHP), respectively. The findings revealed that microbial sulfate reduction remarkably increased arsenic mobilization in both STR and JHP sediments compared to that in unamended sediments. Moreover, the mobilization of As during microbial sulfate reduction coincided with increases in the fluorescence intensity of two humic-like substances, C2 and C3 (R = 0.87/0.87 and R = 0.73/0.66 in the STR and JHP sediments, respectively; p < 0.05), suggesting competitive desorption between DOM and As during incubation. Moreover, the transformations in the DOM molecular characteristics showed significant increases in CHOS molecular and low-O/C-value molecular intensities corresponding to the enhancement of microbial sulfate reduction and the possible occurrence of methanogenesis processes, which suggests a substantial bioproduction contribution to DOM components that is conducive to As mobilization during the microbial sulfate reduction. The present results thus provide new insights into the co-evolution between As mobilization and DOM transformations in alluvial aquifer systems under strong microbial sulfate reduction conditions.

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Roles of dissolved organic matter (DOM) in shaping the distribution pattern of heavy metal in the Yangtze River

Cited by 26 publications

References 70 publications

Novel Implications of the PARAFAC Model for Characterizing and Distributing DOM in Groundwater Networks by Using Spectroscopic Techniques

Novel Implications of the PARAFAC Model for Characterizing and Distributing DOM in Groundwater Networks by Using Spectroscopic Techniques

Using the Potential Transformation of Dissolved Organic Matter to Understand Carbon Emissions from Inland Rivers

Unraveling the Coupled Dynamics between DOM Transformation and Arsenic Mobilization in Aquifer Systems during Microbial Sulfate Reduction: Evidence from Sediment Incubation Experiment

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