npj Clean Water
·
2025
·Vol. 8
·期 1
·1-13
·
IF 11.4
Xia Feiyang,Yang Wei,Zhao Haixiao,Cai Yanpeng,Tan Qian
This study is the first to quantify the migration processes of riverine microplastics under different connectivity contexts based on the spatial variation characteristics of microplastic loads. Microplastics in multidammed, single-dammed, and nondammed rivers are significantly different in three categories: abundance, flux, and inventory. Artificial damming can lead to multicategory reorganization of riverine microplastics, including size, polymer type, shape, and color. Artificial damming has led to the formation of microplastic hotspots in river waters and sediments due to reduced river mobility. Notably, low-velocity regions in non-dammed rivers are high hotspot for microplastic deposition, and their inventories may even be 10.63–12.71 times higher than those of other riverbeds. Additionally, results based on microplastic abundance differ significantly from those based on microplastic loads, which in some cases even showed contradictory results. Therefore, future studies must incorporate microplastic loads into the assessment to enhance our understanding of the fate of microplastics in river systems.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Feiyang Xia,Quanwei Yao,Jun Zhang,Dunqiu Wang
Although microplastics are an emerging pollutant of global concern, little is known about the environmental behavior of microplastic in sediments. This study investigated the occurrence and seasonal variation of microplastics in the sediments of Liangfeng River, China with a fluorescence staining method, and then explored the transfer of microplastics at the water and sediment interfaces during resuspension . The results showed that smaller microplastics were detected in the sediments, which were concentrated in the size range of 50–500 μm. Microplastic abundance in the sediments in the dry season were slightly higher than those from the rainy season, and the rainy season promotes the accumulation of smaller microplastics in the sediment along the river-flow direction but not for the dry season. The shape of microplastics were predominantly fibers, followed by fragments and films. Polyethylene was the most abundant polymer, accounting for more than 50% of the total. Microplastics in the surface sediment move both to the overlying water and deeper sediment during the disturbance process. Disturbance-induced resuspension and vertical transport have significant effects on small-sized microplastics (50–500 μm). Small-sized microplastics can potentially migrate and redistribute via resuspension at different temporal and spatial scales, as some extent of resuspension is occurring in most river systems, especially in urban areas with boat traffic.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Ningbo Geng,Shijiao Hou,Shuai Sun,Rong Cao,Haijun Zhang,Xianbo Lu,Shusheng Zhang,Jiping Chen,Yanhao Zhang
N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediamine-quinone (6PPD-Q) has been identified as the cause of the “urban runoff mortality syndrome.” Thus, the ecological risks of substituted p-phenylenediamines (PPDs) and their quinone derivatives (PPD-Qs) in water have gained global attention. However, large-scale observation of their pollution characteristics in surface water is still lacking. Herein, a nationwide investigation revealed the pervasive occurrence of PPDs and PPD-Qs in riverine waters across China, with the mean concentration of ∑5PPD-Qs being 4.9 times higher than their parent ∑5PPDs. Notably, the 6PPD-Q concentrations at eight sampling sites exceeded the median lethal concentration for coho salmon. National annual riverine fluxes were estimated at 113.1 and 276.2 tonnes/year for PPDs and PPD-Qs, respectively, with the Yangtze River contributing more than one-third of the total fluxes. The transformation of PPDs to PPD-Qs was dependent on atmospheric hydroxylation rates and the half-lives of PPDs. A combined multimedia exposure assessment revealed that water exposure accounted for 82.5% of human exposure to PPDs and PPD-Qs, surpassing the contributions from dust and air exposure. This study provides a comprehensive spatial picture of PPDs and PPD-Qs in China. The national atlas highlights their potential ecological risks and implies that targeted actions should be taken to mitigate potential exposure to PPDs and PPD-Qs.
研究领域:
环境科学
·
毒理学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Water
·
2022
·
IF 0
Yang Liu,Jinao You,Yi Tang,Yong He,Florian Breider,Shu Tao,Wenxin Liu
As an important connection of terrestrial and marine ecosystems, rivers input multitudinous (micro)plastics into the oceans. However, comparisons of field and estimated riverine inputs of (micro)plastics and contributions of multiple parameters are limited. Herein, the mainstream Haihe River (MHR), a typical seagoing river under great pressure of high urbanization and industrialization, is studied as an example. Field samplings were conducted using a 100 μm Manta trawl, and a generalized additive model (GAM) was developed to interpret the differences between the local and estimated riverine inputs. Lower abundance (9.9 ± 7.2 items·m–3) with higher diversity, while higher abundance (11.3 ± 7.5 items·m–3) with lower diversity of microplastics was found during the wet and dry seasons. Polyethylene, polypropylene, and poly(ethylene terephthalate) may originate from nonseasonal sources, while polyamide and polyurethane may come from seasonal sources. The annual (2018–2019) riverine inputs of microplastics and plastics from the MHR into the Bohai Sea were 3.93–5.78 tons (3.91–5.76 billion items) and 30.81–38.67 tons (4.01–5.87 billion items), which were substantially lower than estimations from previous models. GAM gave the main parameters contributing to the variations in microplastics, including hydrochemical conditions (34.4%), dam interception (14.6%), sewage effluents (8.0%), and population density (1.1%). In addition to anthropogenic activities, the effects of hydrochemical conditions on microplastics should also be considered.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2015
·
IF 2.858
Guangpu Liu,Xinquan Liu,Yongchun Zhang,Fang Zhang,Ting Wei,Min Yang,Kaiming Wang,Yongjie Wang,Na Liu,Huiling Cheng,Zhongxi Zhao
Jujube polysaccharides have been proved to have various bioactivities. This study was designed to evaluate the chemical composition and hepatoprotective function of the polysaccharides extracted from Zizyphus jujube cv. Huanghetanzao (HJP). The composition of HJP was determined as heteropolysaccharides with galactose and arabinose being the main components. The pretreatment of mice with HJP significantly ( p < 0.01) reduced the activities of serum hepatic AST, ALT, and LDH induced by CCl 4 or acetaminophen (APAP) while the commercial liver-injury treatment drug silybin did not show any prevention effects. Mechanistic study results indicate that the administration of the CCl 4 - or APAP-injured mice with HJP enhanced SOD and GSH-Px and decreased MDA, indicating that anti-oxidation and detoxification could be the pathways for the liver protection observed. In addition, the liver prevention and treatment effects of HJP on the liver damage induced by CCl 4 or APAP obtained from the liver enzyme analyses were confirmed by the hepatic histopathology studies in mice. Therefore, HJP could be used as a prevention and treatment agent for liver injury induced by liver toxic chemicals and drugs.
研究领域:
食品科学与工程
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2023
·
IF 11.8
Feiyang Xia,Qian Tan,Haiguang Qin,Dunqiu Wang,Yanpeng Cai,Jun Zhang
In rivers, riverbeds are considered to have dual properties as a short-term sink and a source of further mobilization for microplastics. To better understand the sources, storage, and fate of microplastics in river systems, this study quantified the formation of microplastic hotspots in riverbeds and seasonal variations in microplastic inventories in riverbeds, especially for small-sized microplastics (<330 µm), with a fluorescence-based protocol. This study provides first-hand measured evidence for the sequestration of microplastics in the riverbed under low-flow conditions and its export from the riverbed under high-flow conditions. The results show that riverbeds in urban areas are still hotspots for microplastic pollution and that high inputs of urban microplastics control microplastic load in its downstream areas. Seasonal rainfall exported 34.86 % (equivalent to 4.34 × 10 11 items/8.57 t) of microplastic pollution from the riverbed, and its removal capacity may be related to the rainfall intensity. Wider riverbeds are conducive to the formation of microplastic hotspots due to the flow slow down. Most importantly, rainfall-driven scouring of the riverbed can enhance the pollution of small-sized microplastics in the riverbed, especially the smallest-size microplastics (<100 µm). Therefore, this study not only contributes reliable information about the sequestration and export of microplastics in the riverbed, but also provides a possible mechanism to explain the lack of small-sized microplastics (<330 µm) in the ocean.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Heliyon
·
2024
·
IF 3.4
Hongzhe Song,Zhifei Liu,Baozhi Lin,Yulong Zhao,Fernando P. Siringan,Chen-Feng You
The association between clay minerals and organic carbon is pivotal for understanding transport, burial, and preservation processes of sedimentary organic carbon. However, fine-scale microscopic studies are still limited in assessing the effect of diverse clay mineral structures and properties on organic carbon sequestration. In this study, we employed X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy coupled with energy dispersive spectroscopy and electron energy loss spectroscopy analyses to investigate the nanoscale interaction between clay minerals and organic carbon of two typical fluvial sediment samples with contrasting clay mineral compositions and organic carbon origins. Sample from Taiwan shows abundant illite and chlorite with petrogenic organic carbon, while sample from Luzon has significant smectite with pedogenic organic carbon. We observed that the nanostructure of the clay minerals controls the distribution of organic carbon. In the Luzon sample, the organic carbon is tightly associated with smectite, occupying expandable interlayer spaces. In the Taiwan sample, however, the organic carbon is primarily confined on the surface and edge of illite. These findings offer valuable insights into the selective association of organic carbon with clay minerals and underscore the role of clay mineral nanolayer structures in governing the occurrence and preservation of organic carbon in sediments. A comprehensive understanding of these interactions is crucial for accurate assessments of carbon cycling and sequestration in the natural environment.
研究领域:
地质学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Feiyang Xia,Yelin Wang,Dunqiu Wang,Yanpeng Cai,Jun Zhang
Rivers have received extensive attention as a major pathway for microplastics (<5000 μm) from land to ocean. This study investigated the seasonal variation of microplastic contamination in surface water of the Liangfeng River catchment, a tributary of the Li River in China, based on a fluorescence-based protocol, and further explored the migration process of microplastic in the river catchment. The abundance of microplastics (50–5000 μm) was (6.20 ± 0.57)–(41.93 ± 8.13) items/L, of which 57.89–95.12% were small-sized microplastics (<330 μm). The microplastic fluxes in the upper Liangfeng River, lower Liangfeng River, and upper Li River were (14.89 ± 1.24) × 10 12 , (5.71 ± 1.15) × 10 12 , and (1.54 ± 0.55) × 10 14 items/year, respectively. The 3.70% of microplastic load in the mainstream came from the tributary input. Fluvial processes can effectively retain 61.68% of microplastics in the surface water of river catchments, especially for small-sized microplastics. The rainy season is the main period of microplastic retention (91.87%) in the tributary catchment by fluvial processes, while exporting 77.42% of one-year microplastic emissions from the tributary catchment into the mainstream. This study is the first to reveal the transport characteristics of small-sized microplastics in river catchments based on flux variation, which not only can partly explain the “missing small-sized microplastic fraction” in the ocean, but also contribute to improving microplastic model.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NanoImpact
·
2016
·
IF 0
Xiaomei Shi,Zaixing Li,Wei Chen,Liwen Qiang,Junchao Xia,Meng Chen,Lingyan Zhu,Pedro J.J. Alvarez
Wastewater treatment plants (WWTPs) can be important point sources for the discharge of engineered nanomaterials to natural surface waters. In this study, we investigated the fate of nano-TiO 2 in two full scale WWTPs and their receiving streams in northern China (i.e., the Binhe and Minxin rivers, which flow to the Xiaohe River). High resolution transmission electron microscopy , energy dispersion X-ray spectroscopy and X-ray photoelectron spectroscopy analyses indicated that Ti in colloids present in the WWTP effluents and receiving streams originated mainly from engineered nano-TiO 2 . Most of the nano-TiO 2 (74–85%) in the influent sewage was removed by the activated sludge , but significant concentrations (27–43 μg/L Ti) remained associated with colloids in the effluents. Surprisingly, the total concentration of Ti in the receiving river streams was higher (52–86 μg/L), indicating the importance of other sources such as urban runoff. These relatively high Ti concentrations are unlikely to originate from natural sources since they are significantly higher than those in the nearby Yuqiao Reservoir (< 5 μg/L), representing regional background levels. Consistently, Ti levels in fish collected from the Xiaohe River (including muscle and other tissues) were significantly higher than those of fish from the reservoir. Overall, TiO 2 releases through WWTP effluents and other sources (including runoff) are contributing to the relatively high observed concentrations of suspended Ti in the Xiaohe River, which results in accumulation in edible fish tissue.
研究领域:
环境科学
·
生态毒理学
✓ 已验证
产品关联
DOI
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yang Liu,JinAo You,YuJun Li,JiaoDi Zhang,Yong He,Florian Breider,Shu Tao,WenXin Liu
Studies focused only on surface water may underestimate microplastic abundance in aquatic environments. This was the first survey to investigate the vertical (surface, intermediate, and bottom waters) distribution and composition of microplastics (MPs) in the water columns and surface sediments collected from an urban seagoing river in northern China. Microplastic abundance in the water columns ranged from 5.6 to 31.4 items∙L −1 and from 2141 to 10,035 items∙kg −1 dry weight (dw) in the surface sediments. Polyethylene dominated throughout the water columns to the surface sediments, in which low- and high-density polyethylene (LDPE and HDPE) were dominant in the water columns and surface sediments, respectively. The dominant shape of MPs was fibers/lines in both the water column and the surface sediment samples. Different from the estimations, the average abundance of MPs in the surface and intermediate waters was significantly lower ( p < 0.01) than that in the bottom water, which may be due to the resuspension of small-sized MPs in the bottom water. As the MPs size increased, their vertical distributions in the water columns were more affected by the water depth. The results showed that MPs were detained in the water columns of river system, and the high concentrations of MPs in the bottom water could not be neglected.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jianqiao Xu,Junyan Wei,Ruixue Guo,Shengnan Zhang,Xiaolei Teng,Zunyao Wang,Ruijuan Qu
Decachlorobiphenyl (PCB-209) can be widely detected in suspended particles and sediments due to its large hydrophobicity, and some of its transformation products may potentially threaten organisms through the food chain. Here we investigate the photochemical transformation of PCB-209 on suspended particles from the Yellow River. It was found that the suspended particles had an obvious shielding effect to largely inhibit the photodegradation of PCB-209. Meanwhile, the presence of inorganic ions (e.g. Mg 2+ and NO 3 - ) and organic matters (e.g. humic acid, HA) in the Yellow River water inhibited the reaction. The main transformation products of PCB-209 were lower-chlorinated and hydroxylated polychlorinated biphenyls (OH-PCBs), and small amounts of pentachlorophenol (PCP) and polychlorinated dibenzofurans (PCDFs) were also observed. The mechanisms of PCP formation by double •OH attacking carbon bridge and PCDFs formation by elimination reaction of ionic state OH-PCBs were proposed using theoretical calculations, which provided some new insights into the inter-transformations between persistent organic pollutants. In combination with VEGA and EPI Suite software, some intermediates such as PCDFs were more toxic to organisms than PCB-209. This study deepens the understanding of the transformation behavior of PCB-209 on suspended particles under sunlight.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Haidong Zhou,Xiaojing Liu,Xiaomeng Chen,Tianqi Ying,Zhenxi Ying
The investigations on their variation and distribution of 13 called waste-water marking pharmaceuticals (WWMPs) were conducted under 4 hydrophyte conditions (without plants, with submerged aquatic plant ( Myriophyllum verticillatum L.), emergent aquatic plant cattail ( Typha orientalis Presl) and floating aquatic plant ( Lemna minor L.)) in a simulated urban river system. By the calculation of mass balance, the quantitative distribution of WWMPs in water phase, sediment and plant tissues was identified, and the overall removal efficiencies of target pharmaceuticals in the whole system could be determined. Without plants, high persistence of atenolol (ATL) (97.7%), carbamazepine (CBM) (102.8%), clofibric acid (CLF) (101.8%) and ibuprofen (IBU) (80.9%) was detected in water phase, while triclosan (TCS) (53.5%) displayed strong adsorption affinity in sediment. The removal under the planted conditions was considerably raised, compared with no plant condition for most WWMPs. However, TCS did not show obvious differences among the hydrophyte conditions due to its strong adsorption affinity and high hydrophobicity . The relatively higher removal was found for the hydrophilic (logK ow < 1) or moderately hydrophobic (1 < logK ow < 3) pharmaceuticals with submerged and emergent aquatic plants. The highly hydrophobic pharmaceuticals (logK ow > 4.0) did not show significant differences among the whole tests in sediment. Mass balance calculation displayed the removal of CBM (5.6%–13.6%), CLF (4.0%–17.8%) and caffeine (8.4%–17.2%) through the plant uptake was relatively higher. For the rest WWMPs, only small parts (<6.0%) of the initial concentrations were found in plant tissues. The higher removal efficiencies of most WWMPs under the planted conditions indicated that aquatic plants indeed played an important role in the removal of WWMPs although the direct uptakes might not be a dominant pathway to the overall removal of WWMPs. Besides, the floating aquatic plant removed most WWMPs from the water phase efficiently. In contrast, submerged and emergent aquatic plants could effectively remove them in sediment.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）