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61,005 resultsShowing papers similar to Combining the multivariate statistics and dual stable isotopes methods for nitrogen source identification in coastal rivers of Hangzhou Bay, China
ClearHydrochemical Evolution and Nitrate Source Identification of River Water and Groundwater in Huashan Watershed, China
Combined hydrochemical analysis, factor analysis, and isotopic methods were applied to trace nitrate sources and transformations in river water and groundwater of the Huashan watershed in China. A Bayesian isotope mixing model (SIAR) quantitatively apportioned nitrate sources, with both water types dominated by HCO3-Ca hydrochemistry derived from precipitation.
Evaluation of nitrate pollution sources in surface water across the typical rural-urban interface: a case study of Wen-Rui Tang River, China
Researchers identified the main sources of nitrate pollution in a rural-urban Chinese river, finding that human sewage and agricultural runoff were the primary contributors. While focused on nitrogen pollution, the study illustrates how mixed land use creates complex water quality challenges in rivers that also carry microplastics.
Deciphering the spatiotemporal dynamics and source characteristics of nutrients under anthropogenic pressure in Taipu River, China
Researchers assessed seasonal and spatial nutrient dynamics in Taipu River (China) from October 2020 to July 2021 using water quality indices and principal component analysis. Results identified agricultural runoff and sewage as dominant nutrient sources, with spatial patterns reflecting land use along the river.
Basin-Scale Pollution Loads Analyzed Based on Coupled Empirical Models and Numerical Models
This study used a combination of field measurements and computer models to quantify pollutant loads from different sources across a Chinese river basin. Better tools for tracking pollution sources at basin scale can support efforts to reduce microplastic and other contaminant inputs to waterways.
Water Quality Evaluation, Spatial Distribution Characteristics, and Source Analysis of Pollutants in Wanquan River, China
This paper is not about microplastics — it assesses water quality in a Chinese river basin, finding that agricultural runoff and domestic sewage are the main pollution sources, without examining plastic contamination.
Causes of coastal waters pollution with nutrients, chemicals and plastics worldwide
Researchers developed a global model to quantify how rivers transport nutrients, chemicals, microplastics, and macroplastics from land sources to coastal waters across more than 10,000 sub-basins. They found that sewage is responsible for 40-95% of phosphorus and microplastics reaching the oceans, while agricultural runoff and mismanaged waste dominate nitrogen and macroplastic pollution. The study reveals that nearly 45% of global land area qualifies as a multi-pollutant hotspot, home to 89% of the world's population.
Spatial distribution and source apportionment of nitrogen in typical plain river networks and bacterial community response
This study characterized nitrogen types and bacterial community responses across typical plain river networks with different pollution sources (domestic, agricultural, aquaculture), finding that diverse nitrogen speciation in domestically polluted areas drove greater nitrogen cycling gene abundance and more complex bacterial ecological networks.
Distribution Characteristics of Microplastics in Domestic Sewage Waters: A Case Study in Guilin City, China
Researchers collected water samples from 20 sewage outlets in Guilin, China, to characterize microplastic abundance, morphology, and size distribution, and applied multivariate statistical analysis to identify hydrochemical factors influencing microplastic concentrations. The case study provides spatial data on domestic sewage as a microplastic source in a Chinese urban river system.
A Probabilistic Approach to Mapping the Contribution of Individual Riverine Discharges into Liverpool Bay Using Distance Accumulation Cost Methods on Satellite Derived Ocean-Colour Data
This paper develops a probabilistic method using satellite ocean-colour data to map dissolved inorganic nitrogen contributions from rivers into Liverpool Bay. It is not about microplastics and is not relevant to microplastic research.
Ten years of MARINA modeling: Multi-pollutant hotspots and their sources under global change
A decade of MARINA water quality modeling identified multi-pollutant hotspots in rivers, lakes, and coastal waters under historical and projected future global change scenarios, highlighting nutrient pollution and microplastics as co-occurring stressors in heavily impacted watersheds.
Quantifying the environmental impact of pollutant plumes from coastal rivers with remote sensing and river basin modelling
Researchers combined satellite remote sensing with river basin modeling to track pollution plumes from four coastal rivers in Italy, measuring their size, timing, and pollutant loads. The method can estimate how much contamination comes from rainfall runoff versus wastewater discharge, helping managers better understand and address coastal pollution threats.
Characteristics and sources of microplastic pollution in the water and sediments of the Jinjiang River Basin
Researchers characterized microplastic pollution across surface water, groundwater, and sediments throughout the Jinjiang River Basin in China, tracing sources via principal component analysis and documenting contamination from inland areas to the estuary.
Coastal bays serve as reservoirs for microplastics from East China: insights from a mass budget model based on sedimentary findings
Researchers investigated sedimentary microplastics in three representative coastal bays of the Zhejiang Great Bay Area, China, and used a mass budget model to quantify sources and fluxes within each bay system. Riverine discharge accounted for 41.5%-96.7% of total microplastic input, with textile and fishing sources dominant in Hangzhou Bay, mariculture and tourism driving levels in Sanmen Bay, and packaging and agricultural sources prominent in Wenzhou Bay.
Occurrence and distribution of microplastics in domestic, industrial, agricultural and aquacultural wastewater sources: A case study in Changzhou, China
Researchers investigated microplastic occurrence across diverse wastewater sources in Changzhou, China, including domestic, industrial, agricultural, and aquaculture facilities. The study found microplastics present in all types of wastewater, with varying compositions and abundances, highlighting the multiple pathways through which microplastics enter the environment from human activities.
Global multi-pollutant modelling of water quality: scientific challenges and future directions
Researchers argue that tackling global water pollution requires modeling multiple contaminants — microplastics, nutrients, chemicals, and pathogens — simultaneously rather than studying each in isolation. They identify pollution hotspots across Europe, North America, and South Asia where rivers carry dangerous combinations of these pollutants, and call for models that can directly inform policy decisions.
Assessing spatial variability and source identification of heavy metals in agricultural soils: A geostatistical and multivariate analysis of coastal eastern Zhejiang, China
Researchers used geostatistical and multivariate analysis techniques to assess the spatial variability and sources of five heavy metals in agricultural soils along the coast of eastern Zhejiang, China. While focused primarily on heavy metals rather than microplastics, the study provides methodology relevant to understanding pollutant distribution in coastal agricultural areas. The findings identified industrial emissions, agricultural practices, and natural geological processes as key contamination sources.
Future coastal water pollution under global change: multi-pollutant modeling
Researchers describe a global multi-pollutant modeling framework for assessing future coastal water pollution from nutrients, plastics, and chemicals under climate change and urbanization scenarios, arguing that managing multiple pollutants together is essential for achieving clean coastal water goals.
Characteristics and source-pathway of microplastics in freshwater system of China: A review
This national-scale review examines microplastic characteristics and source-pathway dynamics in Chinese freshwater systems including rivers, lakes, and reservoirs, synthesizing data showing that urban runoff, textile washing, and wastewater discharge are dominant sources. The authors identify key knowledge gaps in understanding microplastic transport from inland waters to the ocean in the world's largest plastic-producing country.
Microplastic risk assessment in surface waters: A case study in the Changjiang Estuary, China
Researchers assessed microplastic risk in surface waters of the Changjiang Estuary, finding measurable contamination and identifying this major river delta as a significant source and pathway for microplastic transport into coastal marine environments.
Wastewater Generation and Pollutant Loads in Coastal Regions of Ba Ria–Vung Tau, Southern Viet Nam: Current Status and Future Projections
This study quantified current and projected pollutant loads from domestic, industrial, aquaculture, and stormwater sources in Ba Ria-Vung Tau province, Vietnam, finding domestic wastewater as the dominant source and projecting significant increases by 2035 without improved treatment infrastructure.
Global multi-pollutant modelling: uncovering new perspectives for river exports of nutrients, plastics, and chemicals
This thesis modeled river exports of nutrients, plastics, and chemicals to coastal waters worldwide using a new multi-pollutant model. Researchers found that diffuse sources contributed over 95% of nitrogen and macroplastic exports, while point sources accounted for about 40% of phosphorus and microplastic exports globally. The study projects that 56-78% of the global population will live near more polluted river basins by 2100, with low-income regions in Africa and South Asia facing the highest multi-pollutant exposure.
Source identification of microplastics in highly urbanized river environments and its implications for watershed management
Researchers identified the sources and pathways of microplastics entering highly urbanized rivers in the Shenzhen Bay watershed. The study found that 61.6% of annual microplastic loads came from point sources, with textile washing fibers accounting for over 92% of those, while nonpoint source contributions dominated during periods of heavy rainfall.
Microplastic in tropical island estuaries in China: Source identification and management framework development
Researchers found surprisingly higher microplastic concentrations in the less-urbanized Wanquan River Estuary compared to the Nandu River Estuary in Hainan Island, China, suggesting that tourism and agricultural activities may contribute more significantly to microplastic pollution than urbanization alone.
Modelling future coastal water pollution: impacts of point sources, socio-economic developments & multiple pollutants
Researchers modeled how urbanization and wastewater discharge will affect coastal water pollution by 2100, looking at nitrogen, phosphorus, microplastics, and triclosan. They found that river exports of all four pollutants from point sources are projected to more than double globally, with Africa and Asia seeing the sharpest increases. The study suggests that wastewater treatment improvements could reduce multi-pollutant issues by 30-38%, but economic growth and city expansion may offset those gains.