Origin of Dissolved Organic Matter in Deep Groundwater of Marine Deposits and Its Implication for Metal Binding

Saito, Takumi; Nishi, Shusaku; Amano, Yuki; Beppu, Hikari; Miyakawa, Kazuya

doi:10.1021/acsestwater.3c00505

ACS EST Water

2023

DOI: 10.1021/acsestwater.3c00505

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Origin of Dissolved Organic Matter in Deep Groundwater of Marine Deposits and Its Implication for Metal Binding

Takumi Saito,

Shusaku Nishi,

Yuki Amano

et al.

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2024

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Cited by 2 publications

References 58 publications

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Continuous Monitoring of Monochloramine in Water, and Its Distinction from Free Chlorine and Dichloramine Using a Functionalized Graphene-Based Array of Chemiresistors

Akbar,

Selvaganapathy,

Kruse

2024

ACS EST Water

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Monochloramine (MCA) is commonly added to drinking water as a disinfectant to prevent pathogen growth. The generation of MCA at the treatment plant requires tight control over both pH and the ratio of free chlorine (FC) to ammonia to avoid forming undesirable byproducts such as dichloramine (DCA) and trichloramine (TCA), which can impart odor and toxicity to the water. Therefore, continuous monitoring of MCA is essential to ensuring drinking water quality. Currently, standard colorimetric methods to measure MCA rely on the use of reagents and are unsuitable for online monitoring. In addition, other oxidants can interfere with MCA measurement. Here, we present a solid-state, reagent-free MCA sensing method using an array of few-layer graphene (FLG) chemiresistors. The array consists of exfoliated FLG chemiresistors functionalized with specific redox-active molecules that have differential responses to MCA, FC, and DCA over a range of concentrations. Chemometric methods were employed to separate the analytes’ responses and to generate multivariate calibration for quantification. A minimum of three sensors are required in the array to maintain full functionality. The array has been demonstrated to quantify MCA in buffered and tap water as a low-cost, reagent-free approach to continuous monitoring.

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Continuous Monitoring of Monochloramine in Water, and Its Distinction from Free Chlorine and Dichloramine Using a Functionalized Graphene-Based Array of Chemiresistors

Akbar,

Selvaganapathy,

Kruse

2024

ACS EST Water

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Artificially regulated humification in creating humic-like biostimulators

Sun,

Niu,

Xiao

et al. 2024

npj Clean Water

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Humic substances (HSs), as the “black gold” of global agriculture, have a crucial environmental significance in cleaning harmful compounds, maintaining carbon mass balance, and increasing crop productivity. Unfortunately, the resources of HSs extracted from nature are insufficient, causing the supply, demand, and budget of the humus market to gradually increase. Given the analogous architectures of lignin and HSs, artificially regulated humification (ARH) has a great potential for directionally controlling the oxidative cleavage of lignin and/or the radical copolymerization of lignin precursors, to produce reassembled oligomers and/or polymers that can compare favorably with the function and efficacy of HSs. Herein, different ARH strategies are innovatively proposed to tackle hazardous chemicals and create humic-like biostimulators (H-LBs). We briefly describe the characteristics and functionalities of natural HSs, and summarize the latest approaches and mechanisms of lignin and its precursor-based ARH. In particular, the ARH routes of bio-composting, laccase catalysis, white-rot fungal degradation, Fenton-based advanced oxidation, and hydrothermal humification are comparatively highlighted to govern harmful substrates, enhance carbon sequestration, generate H-LBs, and practice sustainable agriculture. Furthermore, the mechanisms for promoting crop growth of H-LBs are also illustrated. Advances in modulating humification pathways may solve the technological bottlenecks of ARH in-situ and ex-situ by well-stocked lignin and its small derivatives, which are important for decontaminating contaminants, reducing CO2 emissions, and enriching H-LBs in agroecosystems.

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Origin of Dissolved Organic Matter in Deep Groundwater of Marine Deposits and Its Implication for Metal Binding

Cited by 2 publications

References 58 publications

Continuous Monitoring of Monochloramine in Water, and Its Distinction from Free Chlorine and Dichloramine Using a Functionalized Graphene-Based Array of Chemiresistors

Continuous Monitoring of Monochloramine in Water, and Its Distinction from Free Chlorine and Dichloramine Using a Functionalized Graphene-Based Array of Chemiresistors

Artificially regulated humification in creating humic-like biostimulators

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