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
Frontiers in Energy Research
·
2021
·
IF 4.008
Liu Yang,Zhang Yuchen,Xie Tao,Yue Ming,Wang Dongsen,Li Bin
In light of the difficulty of solid-liquid separation of waste PEM drilling fluid in the Bohai oilfield, constructing an inorganic-organic flocculation system is proposed and the processing method of destabilization technology is optimized. The biggest influence factor on the flocculation process of PEM drilling fluid was determined by designing an orthogonal test. The flocculation mechanism was researched through single factor optimization, combined with zeta potential and particle size distribution test. The results showed that the most significant factors affecting the flocculation of waste PEM drilling fluid were the dosage of inorganic flocculant CaCl2 and flocculation pH value. When the dosage of inorganic flocculant CaCl2 was 1.2% (w/v), the dosage of organic flocculant SDYJ-2 was 0.05%, the flocculation pH value was 3, and the flocculation time was 5 min, the flocculation technology reached the optimization and then the liquid yield can reach 70.96%. The mechanism of flocculation and destabilization was as follows: the inorganic flocculant of CaCl2 mainly reduced the zeta potential of clay particles through electric neutralization. 1% CaCl2 could reduce the potential mean value of drilling fluid system from -38.1 mV to -32.5 mV, and then decrease the repulsion among suspensions. Through bridging curling and electric neutralization, the organic flocculant of SDYJ-2 can absorb and wrap the clay particles after flocculation destabilization to form a network spatial structure, which made clay particles aggregate into large flocs and particles. D50 can increase by 21.5 times, when the concentration of SDYJ-2 was 0.15%.
研究领域:
石油工程
·
环境科学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Wenjing Dong,Feng Wang,Mingliang Fang,Jie Wu,Shuaiyu Wang,Ming Li,Jingfeng Yang,Melissa Chernick,David E. Hinton,De-Sheng Pei,Hongxing Chen,Na Zheng,Jingli Mu,Lingtian Xie,Wu Dong
Bohai Bay, in the western region of northeastern China's Bohai Sea, receives water from large rivers containing various pollutants including dioxin-like compounds (DLCs). This study used the established zebrafish ( Danio rerio ) model, its known developmental toxicity endpoints and sensitive molecular analyses to evaluate sediments near and around an industrial effluent site in Bohai Bay. The primary objective was to assess the efficacy of rapid biological detection methods as an addition to chemical analyses. Embryos were exposed to various concentrations of sediment extracts as well as a 2, 3, 7, 8-tetrachlorodibenzo- p -dioxin (TCDD) positive control. Exposure to sediment extract nearest the discharge site (P1) resulted in the most severe- and highest rates of change in embryos and larvae, suggesting that DLC contaminated sediment probably did not occur much beyond it. P1 extract resulted in concentration dependent increases in mortality and pericardial edema. Its highest concentration caused up-regulation of P-450 (CYP)-1A1( CYP1A ) mRNA expression at 72 h post fertilization (hpf), an increase in its expression in gill arches as observed by whole mount in situ hybridization, and an increased signal in the Tg ( cyp1a: mCherry ) transgenic line. The pattern and magnitude of response was very similar to that of TCDD and supported the presence of DLCs in these sediment samples. Follow-up chemical analysis confirmed this presence and identified H7CDF, O8CDF and O8CDD as the main components in P1 extract. This study validates the use of biological assays as a rapid, sensitive, and cost-effective method to evaluate DLCs and their effects in sediment samples. Additionally, it provides support for the conclusion that DLCs have limited remobilization capacity in marine sediments .
研究领域:
环境生物学
·
毒理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MARINE POLLUTION BULLETIN
·
2025
·
IF 4.9
Limin Wang,Aiquan Dai,Yufei Dai,Li Lu,Xinyu Li,Jing Zhao,Keqiang Li
Pesticide residues and their accumulation in marine environments pose potential threats to the ecosystem balance and human health. Assessment of pesticide residue levels and ecological risks in marine waters is insufficient. Therefore, we conducted a quantitative analysis of four different categories of pesticides in the surface waters of the Bohai Sea and Yellow Sea in China. A comprehensive ecological risk assessment framework was constructed based on the importance of ecosystem services, utilizing the risk quotient (RQ) and entropy weighting methods to evaluate the multi-pesticide ecological risks in the study area. Thirteen pesticides were detected in the surface waters, with total concentration levels ranging from 8.18 to 80.60 ng/L, and the herbicide Atrazine and insecticide Imidacloprid were found at the highest levels. Concentration levels were higher in the Bohai Sea than in the Yellow Sea, and the highest area was mainly located on the coast of Shandong Province, China. The ecological risk of multi-pesticide pollution was the highest in the coastal regions of Shandong and was associated with Atrazine and Acetamiprid. Source analysis suggested that triazine herbicide and neonicotinoid insecticides are predominantly land-sourced, whereas sulfonylurea herbicides are primarily atmospheric. This study provides valuable support for formulating relevant environmental protection policies and measures.
研究领域:
环境科学
·
海洋生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER SCIENCE SERIES B
·
2012
·Vol. 54
·期 1
·79-87
·
IF 0.558
Fang Shenwen,Zhang Liehui,Duan Ming,Zhang Jian
This paper presents copolymers of acrylamide, N , N -dimethyl- N -vinylnonadecan-1-ammonium chloride and N -(2,4-dimethylpentan-2-yl) acrylamide synthesized by photopolymerization using modified poly(ethylene imine) as initiator in water. These hydrophobically modified acrylamide copolymers were dissolved in the brine that was used in enhanced oil recovery in Bohai oilfield. It was found that when the content of N -(2,4-dimethylpentan-2-yl) acrylamide and N , N -dimethyl- N -vinylnonadecan-1-ammonium chloride were 0.1 mol % and 0.3 mol %, respectively, the resulting polymer could meet the demand of solution time and the polymer mechanical shear stability required in Bohai oilfield. The solution properties of synthesized copolymers were compared with the hydrophobically modified polymer currently used in enhanced oil recovery in Bohai oilfield.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Wanyu He,Jiaqi Ding,Wanni Liu,Wenjue Zhong,Lingyan Zhu,Lin Zhu,Jianfeng Feng
Due to the widespread use of organophosphate esters (OPEs), the occurrence and trophic transfer of OPEs have attracted attentions in ecosystems. However, as the final sink for these chemicals, the bioaccumulations and trophodynamics of OPEs in marine ecosystems are still not clear. In this study, seawater, sediment and marine organisms collected from Bohai Bay (BHB), Laizhou Bay (LZB), and Liaodong Bay (LDB) in Bohai Sea (BS), China were analyzed to investigate the occurrence, bioaccumulation and trophic transfer of typical OPEs. Total concentration of OPEs (∑ 9 OPEs) in surface water in LZB (255.8 ± 36.44 ng/L) and BHB (209.6 ± 35.61 ng/L) was higher than that in LDB (170.0 ± 63.73 ng/L). Marine organisms in LZB accumulated the highest concentrations of OPEs among the 3 bays (∑ 10 OPEs, 70.56 ± 61.36 ng/g ww). Average bioaccumulation factor (BAF) of OPEs in marine organism in BHB, LZB, and LDB was ranged from −2.48 to 0.16, from −2.96 to 1.78, and from −2.59 to 0.59. We also found that trophic magnification factors (TMF) are generally <1, which suggested trophic dilutions of OPEs in BS, China. Nevertheless, the relatively high OPEs levels in BS still may bring potential risks to ecosystem and human health.
研究领域:
环境科学
·
生态学
·
海洋学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2018
·
IF 3.708
Xiangguang Fang,Qi Wang,Zhen Zhao,Jianhui Tang,Chongguo Tian,Yiming Yao,Junchao Yu,Hongwen Sun
A total of 26 alternative and legacy perfluoroalkyl and polyfluoroalkyl substances (PFASs) were investigated in air collected above the Bohai and Yellow Seas during a research cruise between June 28 and July 15, 2016. ∑PFAS concentrations ranged from 70 pg m −3 to 430 pg m −3 (mean 230 ± 100 pg m −3 ). Trifluoroacetic acid (TFA, mean 120 ± 80 pg m −3 ) and 8:2 fluorotelomer alcohol (8:2 FTOH, mean 34 ± 46 pg m −3 ) were the predominating compounds of ionizable PFASs (i-PFASs) and neutral PFASs (n-PFASs), respectively. The contributions of C 4 and C 6 i-PFASs were higher than those of C 8 i-PFASs. Alternative substances, such as chlorinated 6:2 polyfluoroalkyl ether sulfonic acids (Cl-6:2 PFESA, mean 1.6 ± 1.2 pg m −3 ) and diPAPs (mean 1.6 ± 1.3 pg m −3 ), were only detected on the filter. The distribution coefficient of 10:2 FTOH was higher than 8:2 FTOH, which could be explained by the length of the carbon chain. The gas phase dry deposition velocities were simulated, and the values ranged from 0.08 ± 0.12 cm s −1 to 0.85 ± 0.28 cm s −1 . For i-PFASs and diPAPs, the estimated fluxes of the particle phase were higher than those of the gas phase. For n-PFASs and TFA, the gas phase deposition played a key role. The ∑PFASs dry deposition fluxes were 11–290 ng (m 2 d) −1 (mean 72 ± 67 ng (m 2 d) −1 ). The measurement of the concentrations in the gas and particle phases simultaneously provided a more comprehensive understanding of PFAS behaviours in air.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Feng Wu,Hongying Wang,Junchao Xu,Hou-Qun Yuan,Lintao Zeng,Guang-Ming Bao
A novel fluorescent chemodosimeter for thiophenols has been readily developed from a red emitting Indole-BODIPY . The chemodosimeter displays a significant fluorescence turn-on response towards thiophenols based on nucleophilic substitution reaction. A linear relationship was obtained between the fluorescence intensity and the concentrations of thiophenols ranging from 0 to 1.8 μM. The chemodosimeter can determine thiophenols (4-fluorothiophenol, 4-methoxybenzenethiol, p -toluenethiol) with high selectivity, fast response (within 8 min) and extremely low limit of detection (9.8 nM). The chemodosimeter was successfully used to determine the level of thiophenol (PhSH) in industrial wastewater and Bohai Sea water with good recoveries. Furthermore, the chemodosimeter was employed to image thiophenols in cancer cells with good performance and low cytotoxicity. Therefore, this chemodosimeter has great potential application in environment.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）