Impacts of multiple reservoirs on hydrological cycle and hydrochemical evolution in a mountainous river basin of the North China Plain.

Optical-fiber sensors for dissociation constant measurement of aptamer and rapid detection of ampicillin in river water and milk.

Manganese and carbon co-doping synergistically enhanced oxygen adsorption and internal electric field in BiOCl for photocatalytic superoxide generation and pollutant degradation.

High-selectivity phenol detection in cumene process wastewater via bromination and dynamic optical path.

Semi-automatic silicon rubber based multi-vial microextraction for determination and removal of pesticides from waters and tea.

Comparative assessment of environmental water requirements and river flow health in the Ghezel-Ozan River, Iran

Integrated multi-dimensional framework for water conservation capacity evaluation and attribution in the Yellow River water conservation area

ABSTRACT Paleodepositional conditions during the peat formation control the energy efficiency/potential, physical properties, chemical composition, and utilization potential of coal. Thus, the current study examines the paleodepositional environment of coal deposits of Bastacolla Mines (Bottom-II and Top-III seam), Jharia Coalfield, India, based on petrographic, proximate, and scanning electron microscopy (SEM) analyses. This investigation further explores the energy potential and utilization potential of studied coal samples. The coals from Bastacolla Mines are categorized as high to low volatile bituminous rank based on volatile matter (18.87–26.33%) and vitrinite reflectance (0.93–1.26%). Petrographic indices show that studied coals were mainly deposited in limnic and limno-telmatic environments under ombrotrophic to mesotrophic hydrological conditions. Maceral-based facies diagrams indicate that peat accumulation occurred in alternating oxic to anoxic moor conditions with good tissue preservation. Microlithotype plots are suggestive of a floodplain environment fed by river water. Petrographic constituents suggest that the coals of Bastacolla Mine may contain Type-III kerogen and could generate gaseous hydrocarbons and may be utilized in blending.

The genus Kluyvera is presumed to be the original source of blaCTX-M genes, which encode one of the most prevalent extended-spectrum β-lactamases. We report the draft genome sequence of Kluyvera ascorbata strain KHSU-R5-7, a CTX-M-5 variant producing isolate obtained from Shirakawa River in Kumamoto, Japan.

Feature-enhanced hybrid-optimized convolutional neural network-long short-term memory framework for real-time early warning of sudden total suspended solids pollution events in riverine waters.

The widespread application of neonicotinoid insecticides (NEOs) in urban areas has led to their transport from terrestrial ecosystems into freshwater catchments, where they undergo complex transformation processes. However, the occurrence and potential risks of NEOs and their transformation products (TPs) in urban aquatic ecosystems remain poorly understood. In this study, a comprehensive screening workflow was developed by integrating target analysis, suspect screening, and nontarget analysis through diagnostic fragment searching and molecular networking, and 104 TPs were identified for 11 NEOs in 35 coastal urban river waters from Qingdao, China. In each sample, the cumulative concentrations of NEOs and their TPs ranged from 118 to 4755 ng/L. Five NEOs and seven TPs were ranked as high-priority based on the ToxPi score, which integrated detection frequency, signal intensity, persistence, mobility, and toxicity. Notably, four NEOs (i.e., clothianidin, imidacloprid, thiacloprid, and thiamethoxam) exceeded their respective Environmental Quality Standards in 17-89% of water samples. One additional NEO (i.e., dinotefuran) and seven TPs (i.e., thiacloprid amide, TP271b, TP340b, TP201b, imidacloprid desnitro, TP247a, and TP213b) were ranked higher than clothianidin. Simultaneously, 18 TPs had a higher regulatory priority than the corresponding NEOs, highlighting that these TPs warrant equal attention. Source tracing analysis revealed that urban application and agricultural activities were the primary sources of NEOs and their TPs in urban and mixed land-use areas, respectively. Future efforts should focus on clarifying the ecological risks and major sources of neonicotinoid contamination, in terms of parent NEOs and their TPs, in coastal urban rivers to support source-control regulations for preserving freshwater and marine organisms.

Aiming at the problem of simultaneous monitoring of chlortetracycline (CTC) and lead ions (Pb2+) in food and the environment, high-performance nitrogen/sulfur co-doped blue fluorescent carbon dots (NS-CDs) were successfully synthesized by a one-step solvothermal method using oxalic acid and 1-amino-2-naphthol-4-sulfonic acid as precursors. The NS-CDs have a high quantum yield of 39.5% and excellent photostability. Based on the efficient quenching of NS-CD fluorescence by CTC and Pb2+, a dual-functional fluorescence sensing platform for simultaneous detection of CTC and Pb2+ was constructed for the first time. Under the optimized conditions, the linear detection ranges for CTC and Pb2+ were 0-35 µM (R2 = 0.9911) and 0-5.4 µM (R2 = 0.9948), respectively, and the detection limits were as low as 2.32 µM and 0.22 µM, respectively. The probe was successfully applied to the analysis of real river water samples. The recoveries of CTC and Pb2+ were 92.4-101.5% and 92-98.3% (RSD < 4%), respectively. This work provides a novel, simple and low-cost solution for the rapid and integrated on-site detection of multi-class pollutants in complex matrices.

Contamination by antibiotics has emerged as a global apprehension with serious consequences for ecological and human health. This research screened the levels of azithromycin, cefixime, linezolid, ciprofloxacin, ofloxacin, and levofloxacin in the blood serum of albino rats administered surface water collected from the River Chenab for 30 days. The exposed group (n = 24) exhibited a considerable concentration of azithromycin with an average of 2.74 ± 1.69 µg mL−1, while the control group (n = 6) receiving clean water revealed undetectable concentrations. Correlation analysis uncovered moderate associations among fluoroquinolones, particularly between ciprofloxacin and levofloxacin (r = 0.34), suggesting their shared pharmacokinetics. Detection of antibiotics in blood serum following non-medical exposure confirmed the bioavailability and potential for systemic toxicity. Azithromycin levels indicate potential for unintended pharmacological effects in non-target organisms. This study is the first in Pakistan to demonstrate direct pharmacological exposure from river water to mammalian serum, highlighting an urgent health issue to achieve good health and well-being.

ABSTRACT Sharing river water among co-basin states poses a significant challenge for river basin management, necessitating consideration of numerous interconnected variables for equitable distribution. Practitioners prefer easily implementable methods over complex mathematical models. To address this, the authors have developed RIWASH, a user-friendly software for river water sharing that translates a tested analytical framework into usable software, along with validation against real-world case scenarios. This study presents the executable version of RIWASH, addressing the decision-makers’ preference for practical utility over academic intricacies. RIWASH allows users to input data for co-basin states through six interactive input windows, generating water allocation results in an output window. It enables users to modify input data or variables to observe the impact on water allocation outcomes. Validated in India's Cauvery and Vamsadhara River basins, RIWASH provides objective allocations that adapt to changing hydrological conditions, offering a sustainable solution for co-basin stakeholders.

Influences of hydrometeorological factors on river water δ2H variability in the Xiangjiang River Basin

ARTICLE HIGLIGHTS- Langat River water and sediment quality deteriorate toward downstream.- Dissolved organic phosphorus increases near agricultural areas.- Sediment phosphate retention dominated by non-labile organic phosphorus.- Downstream pollution linked to sediment sorption and nearby agriculture.ABSTRACTThe Langat River traverses rapidly developing urban areas in Malaysia and is significantly affected by anthropogenic activities. The introduction of excessive phosphorus into rivers poses a significant ecological issue. Water and sediments were sampled from nine stations at Langat River to evaluate the current and potential impacts of organic phosphorus. The water quality parameters indicate a progressive decline downstream, attributed to allochthonous sources from tributaries and land use practices, particularly agriculture. Inorganic substances are the principal cause of pollution in the river while degradation of organic pollution biologically is reduced. Dissolved organic phosphorus (DOP) plays a significant role at stations that are either relatively unpolluted or adjacent to agricultural areas, serving as a potential source of bioavailable phosphorus. The total organic phosphorus in the sediment increased downstream, predominantly comprising non-labile fractions (67–78%). The labile fractions exhibit strong correlations with dissolved oxygen (DO) (r = -0.797), dissolved organic phosphorus (DOP) (r = 0.931), and conductivity (r = 0.837), suggesting internal loading to the water column. Increased non-labile fractions indicate the sediment's capacity to retain organic phosphorus. The downstream stations exhibit elevated risk owing to high sorption capacity and proximity to agricultural sources of organic phosphorus.

Photochemical vapor generation (PVG) is an attractive yet under-exploited sample-introduction strategy for atomic spectrometry. There remain challenges in improving the efficiency of PVG of elements and expanding the range of PVG applications. Here, these issues have been tackled by introducing a metal-free porphyrinic covalent organic framework (SU-3), cross-linked by robust polyimide bonds and exhibiting strong ultraviolet light absorption and photocatalytic activity. Liquid-phase exfoliation converts the bulk framework into ultrathin SU-3 nanosheets (SU-3 CONs), further amplifying its photocatalytic capacity. Both SU-3 COF and SU-3 CONs were harnessed as photocatalysts to boost PVG of rhenium (Re) prior to inductively coupled plasma mass spectrometry (ICP-MS), yielding 27-fold and 71-fold signal enhancements, respectively. Compared to bulk COF, the superior performance of nanosheets stems from their more exposed catalytic sites and amplified photocatalytic activity. The method minimizes low-molecular-weight acid consumption, precludes extraneous transition-metal sensitizers, and affords linearity from 0.05 to 100 ng mL-1 with a 0.7 ng L-1 limit of detection─superior to that of traditional PVG methods sensitized by transition metal ions. Accurate Re quantification in river, lake, and tap water samples confirms the robustness and practicality of the method. This work thus establishes metal-free COF nanosheets as a versatile platform for advancing photochemical vapor generation, opening new avenues for ultrasensitive elemental analysis.

The lower Yangtze River basin represents a significant zone for the production, utilization, and emission of organophosphate esters (OPEs). This study examined the occurrence, concentration levels, and spatial distribution of eight commonly found OPEs in the lower Yangtze River water during 2022-2024, while assessing associated ecological and health risks. Five target OPEs maintained high detection frequencies throughout the three-year period. Chlorinated OPEs dominated the OPE profile in surface waters. Spatially, elevated concentrations were observed along the Nanjing-Shanghai river reach. The severe drought in 2022 contributed to comparatively lower overall OPE concentrations. A notable surge in TCEP levels occurred in September 2023, likely attributable to atmospheric wet deposition and industrial wastewater discharges. Data from newly added sampling points near the middle reaches in 2024 indicate lower OPE concentrations. Correlation analysis, principal component analysis, and hierarchical cluster analysis indicated that tris(2-chloroethyl) phosphate (TCEP), tris(1-chloro-2-propyl) phosphate (TCIPP), and tris(1,3-dichloro-2-propyl) phosphate (TDCIPP) primarily originated from inadequately treated sewage and industrial effluents, while tri-n-butyl phosphate (TnBP) and triphenyl phosphate (TPhP) showed strong associations with vehicular emissions, maritime transport discharges, and industrial operations. Ecological risk assessment identified TCEP as requiring particular attention, and health risk evaluation indicated negligible health concerns from OPEs in drinking water sources throughout lower reaches of the Yangtze River.

The ability to discriminate multiple biomolecular signals simultaneously is critical for accurate diagnosis of coinfections and evaluation of the medical environment. Yet, achieving multichannel enumeration within a single recording unit remains a significant challenge. Here, we develop a DNA framework-based positional encoding system, termed the DNA Framework Digital Recorder (DFDR), which enables site-specific discrimination of multiple nucleic acid sequences using a uniform signal reporter. The DFDR is composed of a triangular DNA framework where each edge is site-specifically functionalized with orthogonal probes targeting distinct DNA sequences. We demonstrate that a single DFDR unit can resolve 18 nucleic acid targets simultaneously, 6-fold of the multiplexing capacity over conventional DNA self-assembly-based identification systems. Through temporal control of DNA strand inputs, the DFDR supports sequential and rewritable recording of multiplexed signals. We further validate the system by discriminating 16S rRNA mixtures from clinically relevant respiratory pathogens (Haemophilus, Klebsiella, Staphylococcus, and Lactobacillus). Finally, we demonstrate bacterial identification in real-world samples collected from the hospital environment and natural river water. This work establishes a versatile paradigm for high-resolution tracking of multiplexed molecular information with broad implications for synthetic biology, diagnostics, and information storage.

Arsenic (As), particularly in its bioavailable species of inorganic As(Ⅲ) known for its significant toxicity and mobility, is a carcinogenic risk to humans. Serving as an innovative analytical tool, the diffusive gradients in thin films (DGT) technique facilitates on-site detection of bioavailable metals. However, the options of DGT binding gels tailored for As(Ⅲ) detection remain elusive. This study undertook the modification of tetraethyl orthosilicate with a 3-mercaptopropyl-trimethoxysilane to synthesize cost-effective nanomaterials endowed with the capacity for selective adsorption of As(Ⅲ) through copolymerization and atmospheric pressure drying. The synthesized materials were systematically characterized using X-ray diffraction, scanning electron microscopy, and C/H/N/S elemental analysis, revealing a specific surface area of 472.39m2/g, a particle size of 12.7nm, and a loading capacity of 3.115mmol/g. The DGT combined with gel prepared from this material has a specific affinity for As(III) without adsorbing As(V).Its adsorption efficiency for As(III) may reach 84.5% within the first hour. This DGT technique has a linear detection range of 0.5-15mg/L (R2 = 0.99995), an elution recovery of 85.1%-102.7% (RSD < 10%, n = 3), and a maximum adsorption capacity of 301.7μg/cm2, meeting requirements for long-term environmental monitoring. The experiment studied the effects of interfering factors, including pH values ranging from 3-9, ionic strength of 10-500mmol/L NaNO₃, Fe2⁺ 0-5.0mg/L, Mn2⁺ 0-1.0mg/L, As(V) 0-5.0mg/L, dissolved organic carbon 0-20.0mg/L, SO₄2⁻ 0.55-1.10g/L, and PO₄3⁻ 5.0-10.0mg/L. The device maintained a stable treatment performance under all these conditions. When the DGT device was deployed in spiked river water, estuarine water, and seawater, a comparison of its adsorption performance with existing methods showed that the device had a comparable adsorption performance and demonstrated excellent long-term stability in practical water environment applications.