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
Frontiers in Public Health
·
2024
·
IF 3
Danchen Wu,Zhijing Ma,Haitao Diao,Wanru Wang,Liu Chen,Dalin Zhou,Jing Yang,Quan Zhen
Polycyclic aromatic hydrocarbons (PAHs) were measured in 342 daily PM10 samples collected in four seasons at a site in Bengbu, China. This study was a qualitative and quantitative investigation of the emission sources of atmospheric PAHs in Bengbu and the spatial distribution of regional PAH sources in PM10 samples. The annual concentrations of the 16 EPA priority PAHs ranged from 1.45 to 62.16 ng/m3, with an annual mean of 7.63 ± 7.38 ng/m3. The seasonal trends during the year were: winter (6.13–62.16 ng/m3, median = 14.99 ng/m3) > autumn (2.01–18.78 ng/m3, median = 4.90 ng/m3) > spring (1.45–19.34 ng/m3, median = 3.32 ng/m3) > summer (1.57–4.27 ng/m3, median = 2.12 ng/m3). The PAHs over the year were dominated by medium-molecular-weight PAHs (39.81%), followed by high-molecular-weight PAHs (35.77%), and low-molecular-weight PAHs (24.42%). The diagnostic ratio method and positive matrix factorization revealed that the PAH sources in Bengbu in spring and summer were industrial emissions, coal and biomass combustion, and traffic emissions; while the sources in autumn and winter were coal and biomass combustion and traffic emissions. According to a backward trajectory clustering analysis and potential source contribution function analysis, Bengbu City was mainly affected by pollution from the northern and northwestern regions in spring, autumn, and winter, while it was more affected by the coastal monsoon in summer. The PAH pollution in Bengbu was most severe in spring, autumn, and winter, and the health risk to the population was also most severe at that time. The health risk to adult males (3.35 × 10−4) was greater than the risk to adult females (3.14 × 10−4), and the health risk to adults was greater than the risk to children (2.52 × 10−4).
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2020
·
IF 4.039
Yunchao Wu,Xiaoping Huang,Zhijian Jiang,Songlin Liu
The phosphorus in precipitation provides a significant fraction of the bioavailable phosphorus to fresh and marine waters. To identify the possible sources and interpret the atmospheric deposition processes of phosphorus, we measured the phosphate oxygen isotopes (δ 18 O P ) in the precipitation monthly from October 2015 to March 2017 in Daya Bay, South China Sea. The isotopic results show that the δ 18 O P values in the dry season (+19.60‰ to +25.80‰, +23.10‰ average) were significantly higher than those in the wet season (+12.52‰ to +20.11‰, +16.73‰ average), indicating a variable contribution from different phosphorus sources to the precipitation between seasons. The δ 18 O P value was primarily influenced by the phosphorus concentrations, rainfall, and air temperature. The exchange of phosphate molecules among phosphorus pools caused isotope dilution (wet season) or enrichment effects (dry season) during the seasonal shifts. The δ 18 O P value of the precipitation and the local end-members indicate that coal combustion (39% ± 16%), biomass burning (22% ± 18%), and soil (17% ± 13%) sources dominate in the dry season, whereas marine sources (28% ± 19%) and coal combustion (24% ± 12%) account for the highest proportion in the wet season using a MixSIAR model. The atmospheric wet deposition flux of phosphorus in Daya Bay was 379.0 μmol m −2 ·yr −1 . The wet deposition of phosphorus exhibits a significant seasonal trend with higher deposition fluxes in the wet season than in the dry season as a result of higher rainfall and source shifts (local sources to marine source) between seasons.
研究领域:
环境科学
·
海洋学
✓ 已验证
DOI
高影响因子
Journal of Aquatic Food Product Technology
·
2020
·
IF 1.02
Yan-Fei Liu,Zi-Xuan Wu,Jing Zhang,Yu-Xin Liu,Zhong-Yuan Liu,Hong-Kai Xie,Kanyasiri Rakariyatham,Da-Yong Zhou
Lipid profile of the oyster Crassostrea talienwhanensis from the Yellow Sea was evaluated based on the seasonal changes in lipid categories, phospholipid (PL) categories, fatty acid (FA) composition, atherogenicity index (IA), thrombogenicity index (IT), and glycerophospholipid (GP) molecular species. We observed that the samples harvested in February contained higher levels of polyunsaturated fatty acid (PUFA) (48.77% of total FAs) and PL (52.12% of total lipids) and had lower IA (0.29). In addition, more than 290 GP molecular species of glycerophosphocholine (GPCho), glycerophosphoethanolamine (GPEtn), glycerophosphoserine (GPSer), and glycerophosphoinositol (GPIns) were determined. The molecular species containing eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) constituted 75.24% of total GPCho in the samples harvested in February. Considering the lipid profile, oyster Crassostrea talienwhanensis harvested in February had better nutritional value.
研究领域:
营养学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Fanfan Ju,Liuzhu Chen,Teng Ma,Xiaoli Wang,Zhanqiang Chen,Jiejun Zheng,Xinxing Xia
Studying the geochemical behavior of chlorine is the basis of understanding the chlorine cycle in nature. To explore the spatiotemporal distribution of natural organic chlorine (Cl org ), L layer (litter fall), F–H layer (humification zone), topsoil layer (0–20 cm), and deep soil layer (20–40 cm) samples were collected from 18 sampling sites at different altitudes (851–2918 m) in Shennongjia Forest in May, August, and December. Cl org content was analyzed, and the Cl org stocks were calculated. The major factors affecting the distribution of Cl org were explored. The results revealed that the sum of Cl org content in four layers varied from 7.958 to 184.686 mg/kg, and the highest value was observed in August. Cl org accounted for 46%–77% of total chlorine, with the highest mean ratio in soil layer (0–20 cm). Cl org content exhibited the following trend: F–H layer > L layer > topsoil layer (0–20 cm) > deep soil layer (20–40 cm). The seasonal patterns of Cl org in soil layers were different from that in L and F–H layers, which were mainly controlled by the content and humification degree of organic matter. Cl org storage was much higher in soil layers (61–246 kg/ha) than those in F–H layer (1.1–7.1 kg/ha) and in L layer (0.1–0.8 kg/ha) because of the large thickness of the soil layers. Overall, the Cl org content exhibited an increasing trend with altitude, except at an altitude of approximately 1800 m. Cl org content in L and F–H layers varied more obviously with altitude than that in soil layers. When inorganic chlorine (Cl in ) was not a limiting factor for the chlorination process, Cl org content in L and F–H layers was significantly affected by climate and organic matter controlled by altitude, while Cl org content in soil layers was also mediated by metal ions and pH, and soil particle size. This study could provide a scientific basis for assessing the chlorine cycle in nature.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2019
·Vol. 121
·期 7
·1800493
·
IF 1.852
Zi-Xuan Wu,Xiao-Pei Hu,Da-Yong Zhou,Zhi-Feng Tan,Yu-Xin Liu,Hong-Kai Xie,Kanyasiri Rakariyatham,Fereidoon Shahidi
The scallops Chlamys farreri and Patinopecten yessoensis from the Yellow Sea are evaluated according to the seasonal changes of lipid nutritional value including lipid classes, phospholipid (PL) classes, fatty acid (FA) composition, atherogenicity index (IA), thrombogenicity index (IT), and glycerophospholipid molecular species, for the first time. More than 32 species of glycerophosphocholine (GPCho) and 42 species of glycerophosphoethanolamine (GPEtn) are determined. For samples harvested in February, the PL molecular species containing eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) account for 48.57–50.77% and 80.45–85.50% of total molecular species, respectively, for GPCho and GPEtn. Moreover, the samples harvested in February contain higher levels of polyunsaturated fatty acid (PUFA) (58.76–59.12% of total FA) and PL (84.67–85.11% of total lipids) but lower level of cholesterol (8.77–10.10%) as well as IA (0.29–0.31) and IT (0.12–0.13) compared to samples harvested in other seasons. Therefore considering nutritional value, the lipids from scallops ( C. farreri and P. yessoensis ) harvested in February have better value in view of commercial exploitation. Practical Application : A systematic and in-depth investigation on seasonal changes in basic component and lipid nutritional value in adductor muscle of C. farreri and P. yessoensis is reported in this contribution. This useful information makes it possible to use scallop lipid for producing higher value-added products in view of commercial exploitation. Chlamys farreri and Patinopecten yessoensis from the Yellow Sea are evaluated according to the seasonal changes of lipid qualities including lipid classes, phospholipid classes, fatty acid composition, atherogenicity index, thrombogenicity index, and glycerophospholipid molecular species for the first time. Considering nutritional value, the lipids from scallops ( C. farreri and P. yessoensis ) harvest in February have better value in view of commercial exploitation.
研究领域:
水生生物学
·
营养学
✓ 已验证
产品关联
DOI
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
IEEE Geoscience and Remote Sensing Letters
·
2021
·
IF 3.966
Keren Dai,Ningling Wen,Xuanmei Fan,Jin Deng,Lele Zhang,Rubing Liang,Jie Liu,Qiang Xu
In the context of global warming, monitoring glacial lakes is of great significance for revealing climate change and mitigating glacier lake outburst floods (GLOFs). Multitemporal mapping of glacier lakes through optical satellite remote-sensing imageries can only provide us comparative analysis of glacier lake changes during long time intervals. In recent years, the rapid development of synthetic aperture radar (SAR) has made it possible to observe seasonal changes of glacial lakes. This letter proposed a polarization enhancement-based maximum interclass variance (PE-MIV) method to accurately and automatically mapping the seasonal cycles of glacial lakes based on multipolarization SAR data. Taking the Gongcuo and Langcuo glacial lakes in Laigu village, Tibetan Plateau, as examples, based on 113 Sentinel-1 SAR imageries covering 2017 to 2020 with a 12-day revisiting time, the seasonal boundary changes of both lakes were extracted automatically with a relative accuracy of 93.59%. The seasonal variations of glacial lake area are closely related to temperature and precipitation. This letter demonstrated that the satellite SAR (short revisiting time, multipolarization, etc.) is an effective tool to monitor areal changes of glacier lakes, which can be widely applied in detecting glacier lakes, GLOFs, and their response to climate change.
研究领域:
遥感监测
·
冰川学
·
气候学
·
环境变化
✓ 已验证
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2023
·
IF 5
Fangjie Wang,Xiaoning Chen,Huichen Li,Bowen Huang,Yu He,Zongwei Cai
The interest in the contaminants in PM 2.5 1 (PMs with a diameter of <2.5 μm) has increased because of its potential adverse effects on human health. In this study, seven alkylphenols (APs), which are a typical endocrine-disrupting chemicals (EDCs), were measured by atmospheric pressure gas chromatography-tandem mass spectrometry (APGC-MS/MS). The methods were successfully applied to analyze the PM 2.5 samples collected from Taiyuan and Guangzhou. The total concentration of seven APs was 700.58 pg m −3 in Guangzhou and 916.12 pg m −3 in Taiyuan. The dominant PM 2.5 -bound APs were 4-pentylphenol (4-PeP), 4-nonylphenol (4-NP), and 2-6-di-tert-butyl-4-(hydroxymethyl)phenol (BHT-OH). Meanwhile, a higher concentration of APs was observed in Taiyuan during spring and winter, according with obvious seasonal variation. The presence of APs in air samples from Guangzhou was primarily attributed to human activities. Furthermore, estimated daily intakes (EDIs) of APs via ambient inhalation were calculated for different age groups to evaluate human exposure risk, which revealed that the worst-case EDI for children was 61.29 pg kg bw −1 day −1 , indicating that the presence of APs in the atmospheric environment should not be underestimated.
研究领域:
环境科学
·
公共卫生
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
He-He Tian,Yu-Lian Li,Xu-Song Wang,Xu-Hui Huang,Yu-Ying Zhang,Zi-Chun Zhang,Da-Yong Zhou,Lei Qin
Abalone ( Haliotis spp.) is a shellfish known for its exceptional nutritional value and significant economic worth. This study investigated the dynamic characteristics of non-volatile compounds over a year, including metabolites, lipids , nucleotides, and free amino acids (FAAs), which determined the nutritional quality and flavor of abalone. 174 metabolites and 371 lipids were identified and characterized, while 20 FAAs and 11 nucleotides were quantitatively assessed. These non-volatile compounds of abalone were fluctuated with months variation, which was consistent with the fluctuations of environmental factors, especially seawater temperature. Compared with seasonal variation, gender had less influence on these non-volatiles. June and July proved to be the optimal harvesting periods for abalone, with the levels of overall metabolites, lipids, FAAs, and nucleotides in abalone exhibiting a higher value in June and July over a year. Intriguingly, taurine covered 60% of the total FAAs and abalone could be used as dietary taurine supplementation.
研究领域:
海洋生物学
·
营养学
·
代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Yu-Xi Liu,Yu-Ying Zhang,Jie Zheng,Jia-Nan Chen,Xu-Hui Huang,Xiu-Ping Dong,Bei-Wei Zhu,Lei Qin
Scallop is popular for its delicious taste and rich nutrition value. This study investigated the metabolomic changes in free amino acid (FAA), 5′-nucleotide, and lipid composition of scallops collected in different seasons. Results showed that the content of the FAA and 5′-nucleotide in summer was significantly higher than in other seasons. Adenosine 5′-monophosphate, glycine, and alanine were dominant from June to August. A total of 176 lipids, including 50 triacylglycerols (TAG), 60 phosphatidylcholines (PC), and 30 phosphatidylethanolamines (PE), were identified in the scallop adductor muscle. PC and PE were dominant from February to June, and TAG was dominant in November. The unsaturation degree of TAG was increased from July to November, and the highest proportion of polyunsaturated phospholipids appeared in August and September. Overall, scallops have high nutritional value in summer. This study is helpful for the development of scallop products with high nutrition and high value.
研究领域:
海洋生物学
·
食品科学
·
代谢组学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 7
·6300-6307
·
IF 2.741
Zhang Li,Liu Jutao,Zhang Dawen,Luo Linguang,Liao Qiegen,Yuan Lijuan,Wu Naicheng
Poyang Lake is the largest freshwater lake in China and an important drinking water source. Since the year 2000, toxic cyanobacteria have been observed frequently in Poyang Lake. In the present study, spatial and seasonal variations of microcystins (MCs; MC-RR, MC-YR, and MC-LR) in water column were examined monthly from January to December (except the months of March, May, and November) in 2013, by using ultra-high-performance liquid chromatography-electrospray ionization tandem triple quadrupole/mass spectrometry (UPLC-MS/MS). MC-RR was the most dominant variant, followed by MC-LR, while MC-YR was detected in low concentration. Total MC concentrations (intracellular + extracellular MCs) ranged from 1.26 to 9916.05 ng/L, with an average of 469.99 ng/L, and only 3.14% (6 out of 192 samples) of the water samples contained MC concentrations that exceeded the drinking water guideline level of 1 μg/L for MC-LR proposed by the World Health Organization (WHO). MC concentrations in water column showed obvious seasonal variations in Poyang Lake. Intracellular and extracellular MCs were both at a low level from January to April but increased quickly from June to August and decreased dramatically thereafter. Intracellular MCs exhibited similar spatial distribution pattern with extracellular MCs. Both intracellular and extracellular MC concentrations in eastern bays and around Songmen Mountain of Poyang Lake were higher than other regions. Intracellular MC concentrations were positively correlated with Chl a ( r = 046, P < 0.01), pH ( r = 0.25, P < 0.01), cyanobacterial biomass ( r = 0.40, P < 0.01), and temperature ( r = 0.36, P < 0.01) but negatively correlated with TN ( r = − 0.28, P < 0.01), suggesting that TN, cyanobacteria biomass, pH, and temperature might be regulating factors for MC production in Poyang Lake.
研究领域:
环境科学
·
湖泊生态学
·
水生毒理学
·
环境监测
·
淡水生态学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）