ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 12
·9224-9232
·
IF 2.828
Qin Li,Feng Mingbao,Zhang Xuesheng,Wang Liansheng,Wang Zunyao
Polychlorinated diphenyl ethers (PCDEs) are a group of halogenated aromatic compounds and serious environmental pollutants. In the present study, sediment and water samples from eight sites in Nanjing section of the Yangtze River were characterized with 15 congeners of PCDEs. Concentrations and distributions of these PCDEs in water phase and sediments were analyzed by GC/MS. Results demonstrated that ∑PCDE concentrations were higher in the low water period (1.15–1.80 μg/L) than those in the high water period (0.73–1.30 μg/L) in water phase. Moreover, ∑PCDE concentrations were higher in the low water period (1.58–3.98 μg/kg) than those in the high water period (1.24–3.48 μg/kg) in sediments. A significant linear relationship existed between the ∑PCDE concentrations and TOC contents in sediments, but a poor linearity was found between ∑PCDE concentrations and DOC contents in water phase. Furthermore, the comparison of the percentage compositions in sediments and in water phase showed that CDE-30 (2,4,6-tri-CDE) was the predominant congener in the studied sites, and higher chlorinated congeners accounted for a larger proportion in sediments than those in water phase. In conclusion, the present study demonstrated the prevalent contamination by PCDEs in sediments and water from the Nanjing section of the Yangtze River.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2015
·Vol. 69
·期 4
·453-460
·
IF 1.895
He Qun,Qin Li,Zhang Xuesheng,Wang Liansheng,Sun Ping,Wang Zunyao
Sediment and water samples collected from 8 sites of the Yangtze River in Nanjing section were characterized with 31 congeners of polychlorodibenzothiophenes (PCDTs). Concentrations and percentage compositions of these PCDTs in water and sediments were analyzed by gas chromatography–mass spectrometry. Results showed that ∑PCDT concentrations in sediments were higher (0.86–1.75 μg/kg) than those in water (0.56–1.30 μg/L). A linear relationship existed between ∑PCDT concentrations and total organic carbon content in sediments, whereas there was a poor linearity between ∑PCDTs concentrations and dissolved organic carbon content in water phase. Moreover, percentage compositions showed that penta-chlorinated DTs were the predominant congeners both in sediments and water. Differences existed in the percentage compositions between water and sediments. Highly chlorinated DTs accounted for a larger proportion in sediments than those in water. In conclusion, the present study showed the prevalent contamination by PCDTs in sediments and water from the Nanjing section of the Yangtze River.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MARINE POLLUTION BULLETIN
·
2022
·
IF 7.001
Qian Wang,Hanwen Xu,Jie Yin,Shengnan Du,Caicai Liu,Juan-ying Li
The Yangtze River protection strategies are expected to improve the water quality and ecological function of the Yangtze River Estuary (YRE). The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) and 6 heavy metals (HMs) in the YRE were measured and the riverine fluxes were calculated subsequently. In particular, the concentrations of low molecular weight PAHs (LMW-PAHs), arsenic (As) and mercury (Hg) in seawater decreased over time, while those of other studied pollutants did not change a lot. In sediments, the concentration changes for all the pollutants were insignificant. For the present pollutants, the river input is the dominant source, and the flux decreased after the protection. The contribution of the discharge from wastewater treatment plants (WWTPs) was quantified. Its influence cannot be ignored. The seafood quality remained stable and the risk via diet was insignificant. Long-term monitoring is necessary, and the positive impact of the Protection Strategy is gradually emerging.
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
Analytical Methods
·
2020
·Vol. 12
·期 46
·5581-5590
·
IF 2.596
Xin Pan,Zhangjun Wang,Chao Chen,Hui Li,Xianxin Li,Quanfeng Zhang,Xiufen Wang,Yanan Zhang
Neonicotinoid and fipronil insecticides have been consumed worldwide, particularly in China. There is growing interest in the environmental research community about the occurrence, sources, and risks of neonicotinoids and fipronil. A new method based on high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) and disc solid phase extraction (SPE) techniques were developed for the determination of neonicotinoids and fipronil in seawater in this research. The effects of the styrene divinyl benzene-reverse phase sulfonated (SDB-RPS) membrane-based solid phase extraction optimization process and the HPLC separation parameters on the detection results of the target compounds were studied. Under the optimized conditions, the detection limit of this method for 12 target compounds ranged from 0.05 ng L−1 to 0.50 ng L−1 and absolute recovery was achieved from 58.9–106.5%. The results proved that this method can effectively detect neonicotinoid and fipronil pesticides in seawater. At the same time, dinotefuran, nitenpyram, thiamethoxam, imidacloprid, thiacloprid, fipronil and its metabolites were found in seawater samples from the Yangtze River Estuary and the adjacent sea area. Among them, the total concentration of neonicotinoid insecticides ranged from ND-12.45 ng L−1 and the average total concentration was 3.5 ng L−1; the total concentration of fipronil and its metabolites ranged from ND-2.45 ng L−1, and the average total concentration was 0.79 ng L−1. The results showed that there was contamination of neonicotinoids and fipronil in the Yangtze River Estuary and its adjacent area.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Xiangyu Sun,Jingjing Zhang,Hongliang Li,Yong Zhu,Xingju He,Yibo Liao,Zhibing Jiang,Lu Shou,Zhiwen Wang,Tim C. Jennerjahn,Jianfang Chen
With accelerating anthropogenic activities, the overloading of land-derived nutrients and the resultant eutrophication are threatening coastal aquatic habitats worldwide. In semi-enclosed coastal bays, eutrophication is always considered a local problem that can be mitigated by nutrient reduction at a regional scale. However, as the main nutrient drains major global river discharges can have far-reaching effects over hundreds of kilometers alongshore, which are usually not precisely recognized in local coastal zone management. Here, we first quantified the contributions from both local and remote nutrient sources in Xiangshan Bay (XSB), a eutrophic semi-enclosed bay in China 200 km south of the mouth of the Changjiang River (CJR, the world's third largest river), employing a salinity-based conservative mixing model. We found that the nutrients in Xiangshan Bay were mainly supplied by intruded coastal water fed by CJR discharge, contributing 63 % of dissolved inorganic nitrogen (DIN), 65 % of dissolved silicon (DSi), and 49 % of dissolved inorganic phosphorus (DIP) during the summer of 2017, and 75 % of DIN, 75 % of DSi and 60 % of DIP during the winter of 2019. Additionally, long-term interannual trends in the nutrient concentrations of XSB were generally synchronous with those of the downstream portion of the CJR, indicating that CJR discharge seems to be a strong driver of the eutrophication observed in XSB. In contrast, the impact of local nutrient inputs, such as riverine sewage drainage, aquaculture, biogenic activities, and elemental recycling, was much lower and was regionally limited to the inner bay. Interestingly, the DIP contributions of the local and remote sources were similar, indicating the greater relevance of the internal process. Overall, to mitigate eutrophication in large river-adjacent coastal bays, the inter-regional united practices for nutrient source regulation and ecosystem restoration should be permanently applied along the entire river basin-estuary-coastal continuum.
研究领域:
海洋学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Shukai Liu,Ke Liu,Nan Zheng,Xindong Ma,Wenjun Yao,Xing Liu,Ziwei Yao,Haibo Zhang
Emerging contaminants (ECs) in aquatic environments pose significant risks to biodiversity and ecosystem health, and have garnered widespread attention. The risk ranking and identifying priority control ECs are of crucial for effective water quality management. This study investigated the occurrence and distribution of 102 ECs in the surface water of the Yangtze River estuary and Hangzhou Bay, and conducted risk assessments and priority identification using toxicity-weighted concentration (TWC) and the toxicological priority index (ToxPi). 88 ECs were detected by target analysis, including 42 antibiotics (ANTs), 16 polycyclic aromatic hydrocarbons (PAHs), 14 organochlorine pesticides (OPs), 4 polychlorinated biphenyls (PCBs), tetrabromobisphenol A (TBBPA), 3 hexabromododecanes (HBCDs), 6 polybrominated diphenyl ethers (PBDEs) sample and 2 per- and polyfluoroalkyl substances (PFAS). Risk assessment based on the TWC scheme revealed that 5 ANTs and 4 PAHs posed high risks to aquatic organisms (TWC > 1.0). The ToxPi method effectively integrated detection frequency, concentration, toxicity data, and TWC, providing a ranked list and identifying 12 ECs (5 ANTs, 4 PAHs and 3 OPs) as high priority. This study conducted ecological risk assessment and priority screening of ECs in the Yangtze River estuary and Hangzhou Bay, providing important information for effective management and priority control of ECs.
研究领域:
生态学
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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
·
2024
·
IF 8.2
Shujun Yin,Yafang Liu,Chenhui Wei,Dongqiang Zhu
Freshwater lakes serve as active conduits for processing terrestrial dissolved organic matter (DOM), playing a crucial role in global carbon cycle . Little attention has been paid to how hydrological connectivity to a large river would affect the molecular signatures of DOM in lakes. Here, we systematically characterized and compared the molecular signatures of DOM in surface waters of four large freshwater lakes in the middle and lower Changjiang River basin that are directly connected to the river (Lake Dongting and Lake Poyang, referred to as Lake connected ) or indirectly connected to the river (Lake Chao and Lake Tai, referred to as Lake nonconnected ). The DOM in Lake connected was found to have similar total organic carbon (TOC)-normalized contents and characteristics of lignin phenols to the DOM in surface waters from the upstream Changjiang river, indicating allochthonous/terrestrial sources from riverine inputs. As indicated by the UV–vis and fluorescence analyses, the DOM in Lake connected overall had higher aromaticity and larger average molecular weight as well as stronger allochthonous feature compared to the DOM in Lake nonconnected . Consistently, the FT-ICR MS analysis revealed that the DOM in Lake connected had higher molecular diversity, higher unsaturation degree, and larger proportions of highly aromatic compounds. In contrast, the DOM in Lake nonconnected had larger proportions of lipids and peptide-like structures, but lower proportions of aromatic compounds, which could be ascribed to the enhanced autochthonous production and photodegradation due to pollution and eutrophication as well as longer water residence time. The results highlight the strong impacts of the hydrological connectivity to a large river on the molecular signatures of lake DOM. Capsule The hydrological connectivity of the lakes to the Changjiang River has strong impacts on the molecular signatures of lake DOM.
研究领域:
生态学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2018
·Vol. 34
·期 5
·613-618
·
IF 1.355
Li CHEN,Xiaodong LV,Jiangdong DAI,Lin SUN,Pengwei HUO,Chunxiang LI,Yongsheng YAN
A novel tailored multilayer probe for monitoring potential pyrethroids in the Yangtze River was proposed. The room-temperature phosphorescence method was applied to realize a detection strategy that is superior to the fluorescence method. Efficient Mn-doped ZnS quantum dots with uniform size of 4.6 nm were firstly coated with a mesoporous silica to obtain a suitable intermediate transition layer, then an imprinted layer containing bifenthrin specific recognition sites was anchored. Characterizations verified the multilayer structure convincingly and the detection process relied on the electron transfer-induced fluorescence quenching mechanism. Optional detection time and standard detection curve were obtained within a concentration range from 5.0 to 50 μmol L−1. The stability was verified to be good after 12 replicates. Feasibility of the probe was proved by monitoring water samples from the Zhenjiang reach of the Yangtze River. The probe offers promise for direct bifenthrin detection in unknown environmental water with an accurate and stable phosphorescence analysis strategy.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NORTH AMERICAN JOURNAL OF AQUACULTURE
·
2018
·Vol. 80
·期 4
·436-446
·
IF 0.737
Wentong Xia,Xiao Qu,Yingxue Zhang,Rui Wang,Wei Xin,Chuanbo Guo,Jim Bowker,Yushun Chen
Fish culture in lakes is an important component of aquaculture in some countries, but little is known about its impact on the ecosystem of the impacted lake. In summer 2015, we measured concentrations of 11 heavy metals, including copper (Cu), zinc (Zn), lead (Pb), arsenic (As), and manganese (Mn), in water and sediment from 23 lakes of different aquaculture classifications in the middle reach of the Yangtze River basin, China. These lakes represented the following four lake aquaculture management strategies: fish ranching in lakes classified as receiving low (LOW; used for backup drinking water and irrigation), medium (MEDIUM), or high (HIGH; fish fed commercial feed) stocking rates or as fallow (FALLOW), in which previously ranched HIGH lakes had not been stocked for 2 years. Results showed a positive relationship between most heavy metal concentrations and fish culture intensity. Concentrations of Cu, Zn, and aluminum (Al) in the water column were significantly greater in the HIGH lakes than in the LOW lakes. Heavy metals in the FALLOW lakes did not appear to fully recover from past aquaculture activities. In sediment, the concentration of As in LOW lakes was significantly lower than those in MEDIUM and HIGH lakes, whereas no among-group significant differences in the other heavy metal concentrations were detected. Metals in sediments of all four lake types were at the low ecological risk level. We speculate that these results may be applied to lakes in other regions globally with similar fish stocking and management strategies.
研究领域:
生态学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Ocean University of China
·
2020
·Vol. 19
·期 6
·1353-1361
·
IF 0.802
Chen Yan,Liu Shanshan,Yang Guipeng,He Zhen
Methyl iodide (CH 3 I) is an important trace greenhouse gas in the atmosphere and an ozone-depleting substance. The influence of different environmental factors, such as the duration of illumination; the strength of illumination; the concentrations of humic acid, ferric ion (Fe 3+ ), and iodide ion (I − ); and pH, on the photochemical production of CH 3 I in artificial seawater (ASW) were tested by simulated solar irradiation. In addition, Yangtze River Estuary waters from inshore to offshore were used to explore the relationship between the photochemical production of CH 3 I and different sources of dissolved organic matter (DOM) in natural sea-water (NSW). The results revealed that higher concentrations of humic acid and I − , as well as higher strengths of illumination and longer illumination durations, promoted the photochemical formation of CH 3 I in ASW. The addition of Fe 3+ accelerated the photochemical production of CH 3 I, but high concentrations of Fe 3+ inhibited the formation of CH 3 I. Experiments on NSW obtained from the Yangtze River estuary spiked when concentrations of DOM were high, confirming that DOM plays an important role in facilitating the photochemical production of CH 3 I within the Yangtze River Estuary. The photochemical production of CH 3 I in the seawater was significantly higher under light conditions relative to dark conditions, indicating that illumination accelerated the production of CH 3 I.
研究领域:
海洋学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL TOXICOLOGY
·
2015
·Vol. 39
·期 7
·551-556
·
IF 2.858
Wang Ting,Yu Zhiguo,Shi Yan,Xiang Ping
At the global level, seizures of crystalline methamphetamine (MA) and MA tablets have risen to a new high, indicating that the substance is an imminent threat. MA enantiomer profiling was a useful tool to investigate the prevalence of MA abuse, the intrinsic characteristics of the seized samples and the trends of precursors. In this work, the distribution of enantiomers in clandestine MA crystals and tablets seized mainly in the Yangtze River Delta region, China, from 2008 to 2014 were identified. The MA samples were diluted with internal standard methanol solution, and analyzed by LC–MS-MS. The detection limits of the enantiomers were 0.04 μg/L. The limit of quantification was 0.1 μg/L. As little as 0.2% of the R-enantiomer ratio could be determined. Standard calibration curves of S- and R-MA showed good linearity in the range of 0.1–80 μg/L (r2 > 0.995). All of the seizures were optically pure S-enantiomer in the years 2008 and 2009. Seized samples containing a slight amount of R-MA began to appear in 2010 and increased in the year 2014. No racemic mixture or R-isomer of MA was seized. From this study, we could find out that smuggling routes and/or precursors might be silently changing in the Yangtze River Delta region, China.
研究领域:
分析化学
·
法医学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Zhao Tang,Haifeng Zhang,Rongmao Wang,Chunmiao Wang,Yu Zhang,Min Yang
Synthetic phenolic antioxidants (SPAs) and parabens, particularly the high-molecular-weight (HMW) SPAs and long alkyl chain (LAC) parabens with higher environmental persistence and toxicities, are widely produced and applied worldwide. However, their occurrence and potential risks in aquatic environments remain largely unknown. This work investigated 11 HMW SPAs and 3 LAC parabens in the river and treated industrial wastewater samples along the Yangtze River, the largest river and most important source water in China. For convenience of comparison, 6 short alkyl chain (SAC) parabens were also included. In 15 industrial wastewater treatment plant effluents (effluent-IWTPs) and 34 surface water monitoring sections along the river, 19 out of 20 target compounds were detected with total concentrations (TCs) from 152.5 to 1955.5 ng/L and 141.3 to 1364.9 ng/L in effluent-IWTPs and surface water, respectively. HMW SPAs 1,3,5-tris-[(3,5-di‑tert‑butyl‑4-hydroxyphenyl) methyl]-1,3,5-triazinane-2,4,6-trione (AO3114) and octadecyl 3-(3,5-di‑ tert ‑butyl‑4-hydroxyphenyl) propionate (AO1076) were the dominant ones. HMW SPAs bis(3‑tert‑butyl‑4‑hydroxy-5-methylphenyl) propionate (AO245) and 4,4′-sulfanediylbis(2‑tert‑butyl‑5-methylphenol) (AO-TBM6) and SAC parabens propylparaben (PrP) and butylparaben (BuP) posed medium to high potential ecological risks in 27 surface water monitoring sections. Additionally, AO-TBM6 also exhibited potential health risks in 2 out of 11 drinking water sources. Though the ecotoxicity data are very limited, the ubiquitous presence of the LAC parabens including hexylparaben (HeP) and octylparaben (OcP) in surface water should be of concern since these compounds usually exhibit stronger estrogen potencies than the SAC ones. Finally, kernel density analysis revealed that regulation of industrial discharges is necessary to mitigate the HMW SPA and paraben contamination.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）