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Wang Z, Liu K. Nutrients transport behavior in inlet river in the Yellow River Delta in winter. MARINE POLLUTION BULLETIN 2023; 197:115815. [PMID: 37984090 DOI: 10.1016/j.marpolbul.2023.115815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 11/12/2023] [Accepted: 11/15/2023] [Indexed: 11/22/2023]
Abstract
The nutrients such as dissolved inorganic nitrogen (DIN, NH4+-N, NO2--N, and NO3--N), dissolved inorganic phosphorus (DIP, PO43-) and dissolved SiO2 (DSi) funneled by the inlet river are the dominant factors to coastal eutrophication. This study investigated nutrient transport process in typical inlet rivers in the Yellow River Delta. The indicator of coastal eutrophication potential and concentration ratio between upstream and downstream stations were used to evaluate the influence of different sources to the nutrient risks. It showed that urban areas are the most important source of the nutrients in studied rivers. The harbor and mariculture would have greater risk because of their proximity close to the coastal area. Wetland was a vital conversion to eliminate the river nutrients, and the retention could reach 80 %. It is imperative to protect and construct wetlands to reduce the nutrient pollution in the inlet river.
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Affiliation(s)
- Zhaohua Wang
- First Institute of Oceanography, MNR, Qingdao 266061, China
| | - Kai Liu
- Dongying Marine Development Research Institute, Dongying 257091, China.
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Smolíková V, Pelcová P, Ridošková A, Leermakers M. Diffusive Gradients in Thin-films technique for uranium monitoring along a salinity gradient: A comparative study on the performance of Chelex-100, Dow-PIWBA, Diphonix, and Lewatit FO 36 resin gels in the Scheldt estuary. Talanta 2021; 240:123168. [PMID: 34954614 DOI: 10.1016/j.talanta.2021.123168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/10/2021] [Accepted: 12/21/2021] [Indexed: 10/19/2022]
Abstract
Monitoring of uranium in the environment using the Diffusive Gradients in Thin-films (DGT) technique gains in importance as it can provide unique information about the bioavailability of the element and allows its long-term in-situ measurement. Hence, in this study, four DGT binding phases (Chelex-100, Dow-PIWBA, Diphonix, and Lewatit FO 36 resins) were evaluated for uranium monitoring to assess the robustness of their performance in estuarine and marine environments. These DGTs were deployed along the Scheldt estuary (Belgium and the Netherlands) over four campaigns between 2014 and 2021. The DGT performance (ratio of the DGT-determined vs. dissolved U concentration in grab water sample) varied with the water salinity. The Chelex-100 DGTs generally provided good performance in freshwater (median ratios close to 1.0), but an inverse correlation with the increasing salinity was observed (median ratios 0.7 at the stations with salinity >5). The Lewatit FO 36 DGTs provided good performance in the salinity range 0-18 (median ratios 1.0). However, a strong negative influence was observed at stations with high salinity levels (>18, ratio 0.6) and during the long-term deployment in seawater (ratios <0.5 over deployment periods ≥2 days). The Dow-PIWBA and Diphonix DGTs provided overall similar results with excellent performances along the whole salinity gradient (median ratios 1.1 and 1.0, respectively). Nevertheless, the long-term deployment trial in seawater (salinity ∼27) revealed the robustness of Diphonix DGTs that provided outstanding results even after 28 days of deployment (ratio 1.0). The differences in the performance of tested DGT resins were mostly given by the changes of U speciation along the salinity gradient. The speciation modelling of U showed that calcium uranyl carbonate complexes dominate along the Scheldt estuary (from 97 to 86% seawards) with increasing fraction of UO2(CO3)34- (from 2 to 14%) towards the mouth.
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Affiliation(s)
- Vendula Smolíková
- Analytical, Environmental and Geochemistry, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, Belgium; Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Pavlína Pelcová
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Andrea Ridošková
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Martine Leermakers
- Analytical, Environmental and Geochemistry, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, Belgium.
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You N, Chen Y, Zhang QX, Zhang Y, Meng Z, Fan HT. In-situ monitoring of phenol in surface waters by diffusive gradients in thin films technique based on the nanocomposites of zero-valent iron@biochar. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 735:139553. [PMID: 32473426 DOI: 10.1016/j.scitotenv.2020.139553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/17/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
The nano-sized zero valent iron assisted biochar from hazelnut shell (nZVI@biochar) was prepared and assessed for the feasibility as the binding agent in diffusive gradients in thin-films (DGT) technique. The 1.5% agarose solution containing the optimal nZVI@biochar dose of 15 g L-1 was used to prepare the nZVI@biochar binding gel which owned a high capacity (1010 ± 50 μg disc-1) and a rapid uptake within 30 min. The elution efficiency of phenol from the loaded binding gel was up to 99.3% using the mixture of 1% hydroxylamine hydrochloride and 0.05 mol L-1 HCl. The phenol uptake of nZVI@biochar-DGT increased linearly with the increase of deployment time (R2 = 0.9938) and was in accord with the theoretical values from DGT equation, while there was no notable interference of the sample matrixes on the phenol uptake of nZVI@biochar-DGT in the spiked freshwaters. The good performance of nZVI@biochar-DGT was found under a range of pH (4.1-10.2), ionic strength (as pNaNO3) (0.155-4), and dissolved organic matter up to 20 mg L-1. In field, the monitoring of nZVI@biochar-DGT was more representative than the results from the grab-sampling with better precision and lower sampling frequency, which can provide reliable information, reduce the cost of human resources, and improve efficiency. These illustrate that the nZVI@biochar is more suitable as the binding agent of DGT for uptake of phenol and nZVI@biochar-DGT is an effective tool to monitor in-situ phenol in waters.
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Affiliation(s)
- Nan You
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
| | - Yang Chen
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
| | - Qing-Xin Zhang
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
| | - Ying Zhang
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
| | - Zhuo Meng
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
| | - Hong-Tao Fan
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China.
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Ren M, Ding S, Shi D, Zhong Z, Cao J, Yang L, Tsang DCW, Wang D, Zhao D, Wang Y. A new DGT technique comprised in a hybrid sensor for the simultaneous measurement of ammonium, nitrate, phosphorus and dissolved oxygen. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 725:138447. [PMID: 32305641 DOI: 10.1016/j.scitotenv.2020.138447] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
A new diffusive gradients in thin films technique (ZrO-AT DGT) with zirconium oxide, A-62 MP and T-42H resins containing in a single binding gel was developed for simultaneous measurement of nitrate (NO3-N), ammonium (NH4-N) and phosphate (PO4-P). The DGT uptake was found to be independent of pH variation from 3.2-8.7. Ionic strengths below 5, 10 and 750 mmol·L-1 NaCl did not affect DGT uptake of NH4-N, NO3-N and PO4-P, respectively. This new DGT was deployed in natural freshwater environments, with in situ measurements of the three nutrients found to be accurate. It ensured that rinsing the exposed surface of the DGT device at 3-day intervals can prevent biofouling. Additionally, a hybrid sensor comprising the novel DGT binding layer overlying an O2 planar optrode was tested in sediments to evaluate the dynamics of O2 and the three nutrients. Results showed that PO4-P and NO3-N fluxes decreased while fluxes of NH4-N increased under aerobic conditions. Nearly simultaneous variation in O2 and NO3-N was observed at the sediment-water interface (SWI) and transformation of NO3-N and PO4-P was found to be sensitively influenced by O2 dynamics.
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Affiliation(s)
- Mingyi Ren
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China,.
| | - Dan Shi
- School of Resources and Environment, University of Jinan, Jinan 250022, China
| | - Zhilin Zhong
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingxin Cao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liyuan Yang
- School of Resources and Environment, University of Jinan, Jinan 250022, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Dan Wang
- Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China
| | - Donghua Zhao
- Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China
| | - Yan Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China
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Zhu X, Ma J. Recent advances in the determination of phosphate in environmental water samples: Insights from practical perspectives. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.115908] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Li Y, Chen H, Zhu Y, Zhang T, Gu J, Xu Y, Li J. Molecularly imprinted polymer based diffusive gradients in thin-films for in situ selective sampling and determination of ciprofloxacin. J Sep Sci 2018; 41:3946-3952. [DOI: 10.1002/jssc.201800649] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/15/2018] [Accepted: 08/18/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Yanan Li
- College of Chemistry and Chemical Engineering; Bohai University; Jinzhou P. R. China
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
| | - Hong Chen
- College of Chemistry and Chemical Engineering; Bohai University; Jinzhou P. R. China
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
| | - Yu Zhu
- College of Chemistry and Chemical Engineering; Bohai University; Jinzhou P. R. China
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
| | - Tingting Zhang
- College of Chemistry and Chemical Engineering; Bohai University; Jinzhou P. R. China
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
| | - Jiali Gu
- College of Chemistry and Chemical Engineering; Bohai University; Jinzhou P. R. China
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
| | - Yongxia Xu
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
- College of Food Science and Technology; Bohai University; Jinzhou P. R. China
| | - Jianrong Li
- National & Local Joint Engineering Research Center of Storage; Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou P. R. China
- College of Food Science and Technology; Bohai University; Jinzhou P. R. China
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