المؤلفون: Qingjie Gong, Zeming Shi

المصدر: Applied Sciences, Vol 13, Iss 14, p 8220 (2023)

مصطلحات موضوعية: n/a, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: The 9th national conference on applied geochemistry in China will be held in Chengdu, Sichuan province, in October 2023, hosted by the committee of applied geochemistry, the Chinese Society for Mineralogy, Petrology and Geochemistry (CSMPG) [...]

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2076-3417/13/14/8220Test; https://doaj.org/toc/2076-3417Test

الوصول الحر: https://doaj.org/article/2cc30e70670748478c7eb807f9cd37a2Test

المؤلفون: Jia Zhang, Shide Mao, Zeming Shi

المصدر: Applied Sciences, Vol 13, Iss 6, p 3659 (2023)

مصطلحات موضوعية: CO2-CH4-N2 system, equation of state, CCS, excess enthalpies, fluid inclusion, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: An equation of state (EOS) of CH4-N2 fluid mixtures in terms of Helmholtz free energy has been developed by using four mixing parameters, which can reproduce the pressure-volume-temperature-composition (PVTx) and vapor-liquid equilibrium (VLE) properties of CH4-N2 fluid mixtures. The average absolute deviation of all the PVTx data available up to 673.15 K and 1380 bar from this EOS is 0.38%. Combining this EOS of CH4-N2 fluid mixtures and the EOS of CH4-CO2 and CO2-N2 fluid mixtures in our previous work, an EOS of CO2-CH4-N2 fluid mixtures has been developed, which is named ZMS EOS. The ZMS EOS can calculate all thermodynamic properties of ternary CO2-CH4-N2 fluid mixtures and the average absolute deviation of the PVTx data from the ZMS EOS is 0.40% for the CO2-CH4-N2 system. The ZMS EOS can be applied to calculate excess enthalpies of CO2-CH4-N2 fluid mixtures, predict the solubility of CO2-CH4-N2 fluid mixtures in brine and water, and quantitatively estimate the impact of the impurities (CH4 and N2) on the CO2 storage capacity in the CO2 capture and storage (CCS) processes. The ZMS EOS can also be applied to calculate the isochores of CO2-CH4-N2 system in the studies of fluid inclusions. All Fortran computer codes and Origin drawing projects in this paper can be obtained freely from the corresponding author.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2076-3417/13/6/3659Test; https://doaj.org/toc/2076-3417Test

الوصول الحر: https://doaj.org/article/1c3059ede42345969019203346df09ccTest

المؤلفون: Bing Zhou, Zhixue Zhang, Zeming Shi, Hao Song, Linsong Yu

المصدر: Applied Sciences, Vol 12, Iss 22, p 11591 (2022)

مصطلحات موضوعية: zircon U–Pb dating, geochemistry, late Triassic, Paleo-Tethys Ocean, syn-collisional, Dahongliutan pluton, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: Triassic granitoids are abundant on the northwestern margin of the Tibetan Plateau. The Dahongliutan pluton, located in the eastern Western Kunlun orogen, formed in the Late Triassic.Previous field studies have identified potential mixing of crustal and mantle magmas. In this study, we used zircon U–Pb ages and major and trace elemental analyses to investigate the tectonic evolution of the pluton, and to determine whether any exchange of mantle-derived material occurred between the pluton and the source area. We found that the pluton has relatively high SiO2 contents, and the aluminum saturation index is consistent with peraluminous high-K calc-alkaline granite. The pluton is enriched in light rare earth elements; both light and heavy rare earth elements are highly fractionated. The magma that formed the pluton was predominantly derived from the crust; however, a small amount of upper mantle material was involved in the early stages of magma formation. The pluton underwent composite emplacement as a result of tectonic extension and magmatic emplacement, which may have occurred in the late Triassic post-collisional orogenic stage. Late Triassic magmatism provided heat and ore-forming material for Pb–Zn, Cu, Fe, and rare metal mineralization, which is of considerable importance for geological prospecting.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2076-3417/12/22/11591Test; https://doaj.org/toc/2076-3417Test

الوصول الحر: https://doaj.org/article/07cf5d2241c340d8851c36156b372672Test

المؤلفون: Junji Zhang, Xinyu Wang, Zeming Shi, Liu Shuting, Weiwen Huang, Shijun Ni

المصدر: Soil and Sediment Contamination: An International Journal. 31:386-403

مصطلحات موضوعية: Cadmium, Irrigation, Waste management, Environmental remediation, business.industry, Health, Toxicology and Mutagenesis, Soil Science, chemistry.chemical_element, engineering.material, Food safety, complex mixtures, Pollution, Industrial waste, chemistry, Wastewater, Soil water, engineering, Environmental Chemistry, Environmental science, Fertilizer, business

الوصف: Accumulating heavy metal contamination in soils caused by industrial waste, fertilizer, and wastewater irrigation is a matter of grave concern for the environment and food safety. In recent years, ...

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::2d613de7022b80f47544d6dce1a76a3fTest
https://doi.org/10.1080/15320383.2021.1960795Test

المؤلفون: Zeming Shi, Youliang Chen, Ying Gao, Ying Yu, Qian Zhao, Haolin Bao, Qing Mou

المصدر: Geostandards and Geoanalytical Research. 44:617-627

مصطلحات موضوعية: Trace (semiology), Materials science, chemistry, Geochemistry and Petrology, Radiochemistry, chemistry.chemical_element, Cobalt ions, Geology, Inductively coupled plasma mass spectrometry, Surface water, Bismuth

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::1662db88339cb197fbab793b09e17cbeTest
https://doi.org/10.1111/ggr.12319Test

المؤلفون: Rong Liao, Zeming Shi, Yuejiao Chen, Xinyu Wang

المصدر: Chemistry and Ecology. 36:475-485

مصطلحات موضوعية: 021110 strategic, defence & security studies, Ecology, Chemistry, Flooding (psychology), 0211 other engineering and technologies, Sediment, chemistry.chemical_element, Sorption, 02 engineering and technology, 010501 environmental sciences, Uranium, Kinetic energy, 01 natural sciences, Redox, Environmental chemistry, General Earth and Planetary Sciences, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, General Environmental Science

الوصف: The effects of the flooding and initial Eh of sediments on the sorption of uranium onto the sediments were analysed by flooding and static experiments. The changes in uranium species with Eh and ki...

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::55eee88f42bd92505a08ccfc9dcc4323Test
https://doi.org/10.1080/02757540.2020.1736574Test

المؤلفون: Yun Hou, Qing Lin, Shijun Ni, Xinyu Wang, Yunzhen Li, Zeming Shi

المصدر: Geochemistry: Exploration, Environment, Analysis. 20:357-365

مصطلحات موضوعية: Pollution, 021110 strategic, defence & security studies, media_common.quotation_subject, 0211 other engineering and technologies, chemistry.chemical_element, Sediment, Heavy metals, 02 engineering and technology, General Chemistry, 010501 environmental sciences, Uranium, 01 natural sciences, Phosphate mining, Pore water pressure, chemistry, Geochemistry and Petrology, Environmental chemistry, General Earth and Planetary Sciences, Environmental science, Water quality, Interstitial water, 0105 earth and related environmental sciences, General Environmental Science, media_common

الوصف: To clarify the mechanism controlling the migration of uranium and typical heavy metals at the sediment–water interface, four sampling cores were collected along the Mianyuan River near a phosphate mining region to investigate their distribution in pore water and sediment along vertical profiles. This study indicated that: (1) the average concentrations of U, Cd, Cu, Pb, Zn and Ni in the pore water were 2.17, 0.08, 6.28, 1.78, 80.56 and 5.18 µg l−1 , respectively, some of them being higher than the National Recommended Water Quality Criteria. (2) The enrichment of U, Cu, Pb, Zn and Ni in the sediment near the urban area clearly indicated that local industries were important pollution sources. (3) The average diffusive fluxes of U, Cd, Cu, Pb, Zn and Ni of the four profiles were 0.016, 0.007, 0.300, 0.022, 2.925 and −1.328 µg/(m2·d), indicating that most of the metals diffused from the sediment pore water to the overlying water. (4) The IWCTU (Interstitial Water Criteria Toxic Units) values of Pb in the pore water exceeded 1 in most river sections, indicating that the toxicity levels in the sediments presented a risk to aquatic organisms.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::21fe93f1c82a108edbdf31ce1d171501Test
https://doi.org/10.1144/geochem2019-057Test

المؤلفون: Yuejiao Chen, Yun Hou, Kailiang Zhang, Zeming Shi, Rong Liao, Xinyu Wang, Junji Zhang

المصدر: Journal of Radioanalytical and Nuclear Chemistry. 323:159-168

مصطلحات موضوعية: Sorbent, Ternary numeral system, Chemistry, Health, Toxicology and Mutagenesis, Inorganic chemistry, Public Health, Environmental and Occupational Health, chemistry.chemical_element, Sorption, engineering.material, Uranium, Phosphate, Pollution, Endothermic process, Analytical Chemistry, chemistry.chemical_compound, Adsorption, Nuclear Energy and Engineering, Illite, engineering, Radiology, Nuclear Medicine and imaging, Spectroscopy

الوصف: The effects of pH, sorbent dosage, total phosphorus concentration, initial uranium concentration, shaking time, temperature, and uranium species of a solution of illite for uranium adsorption were investigated with static experimental methods. The sorption process is a nonlinear multi-layer sorption on the non-uniform surface of illite, dominated by chemical ion-exchange adsorption, an endothermic and spontaneous process that increases entropy. The pseudo-second-order kinetic model can depict the sorption of uranium on illite well. This study is expected to provide theoretical support for research on the sorption mechanism of uranium on illite in plurality systems.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::25da7f053bbee881fb18f7041976a365Test
https://doi.org/10.1007/s10967-019-06878-yTest

المؤلفون: Ruilin Wang, Laishi Zhao, Xinyu Wang, David G. Kinniburgh, Bocheng Zhu, Ke Cheng, Zeming Shi, Shijun Ni, Yun Hou

المصدر: Journal of Geochemical Exploration. 204:33-42

مصطلحات موضوعية: Aqueous solution, Chemistry, Environmental remediation, Fertilizer plant, chemistry.chemical_element, 010501 environmental sciences, Uranium, 010502 geochemistry & geophysics, Uranyl, 01 natural sciences, River water, chemistry.chemical_compound, Thermodynamic database, Geochemistry and Petrology, Stability constants of complexes, Environmental chemistry, Economic Geology, 0105 earth and related environmental sciences

الوصف: A complete and accurate set of thermodynamic data for aqueous uranium species is necessary in order to determine the toxicity of uranium in water, to predict its fate in the environment and to design possible remediation strategies for polluted environments. Comparisons of the completeness and accuracy of the thermodynamic databases for aqueous uranyl complexes involving common inorganic anions (OH−, SO42−, PO43−, CO32−, SO42−, Cl−,F−, I−, Br−) and some organic ligands have been made between a number of publicly-available thermodynamic databases (MINTEQ, LLNL, WATEQ4F, ThermoChimie, NEA-TDB, and PSI/Nagra). The results indicates that: (1) stability constants for most aqueous inorganic uranium species in the ThermoChimie, NEA-TDB, and PSI/Nagra databases are broadly similar, but ThermoChimie includes a greater number of organic uranium species; (2) ThermoChimie and two other modern developing databases (NEA-TDB, and PSI/Nagra) are recommended for calculating uranium speciation in natural/polluted waters except for those containing high concentrations of inorganic phosphate; (3) the stability constant for U(OH)4 from the LLNL database is much greater than the values found in the other databases (by four orders of magnitude) and needs to be replaced; (4) the MINTEQ, LLNL, and WATEQ4F databases need updating for many important uranium species including Ca2UO2(CO3)3, UO2(H2AsO4)2 and all the organic uranium species, and (5) the MINTEQ database does not include U(IV)‑bromine, U(IV)‑iodine or U(IV)-nitrate complexes, while the other databases do not include U(IV)-phosphate complexes. A case study of the water chemistry in a phosphate mining region of China, including river water from close to a fertilizer plant, indicates that the calculated uranium speciation varies greatly between the different databases. In particular, the existence and stability of the UO2(HPO4)22− species needs confirmation and quantification including supporting spectroscopic measurements. Although the stability of the stronger bioavailable uranyl-phosphate complexes remains uncertain, the available thermodynamic data suggests that the proportion and toxicity of most uranyl-phosphate complexes will be negligible when the pH exceeds 8.5 and the inorganic phosphate concentration (as PO43−) is

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::81d2f45dbbfef87f88da0900d98c777fTest
https://doi.org/10.1016/j.gexplo.2019.05.001Test

المؤلفون: Shijun Ni, Fei Wei, Junji Zhang, Xinyu Wang, Chao Liao, Zeming Shi

المصدر: Sustainability, Vol 13, Iss 3729, p 3729 (2021)
Sustainability
Volume 13
Issue 7

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, Geography, Planning and Development, lcsh:TJ807-830, Linear correlation analysis, lcsh:Renewable energy sources, Cd and Pb, 010501 environmental sciences, Management, Monitoring, Policy and Law, 01 natural sciences, complex mixtures, chemistry.chemical_compound, farmland topsoil, Coal, lcsh:Environmental sciences, 0105 earth and related environmental sciences, Isotope analysis, multivariate statistical analysis, lcsh:GE1-350, Topsoil, Renewable Energy, Sustainability and the Environment, business.industry, source of pollution, lcsh:Environmental effects of industries and plants, Coal mining, Flow direction, Phosphate, lcsh:TD194-195, Phosphorite, chemistry, Pb isotope, Environmental chemistry, Environmental science, business

الوصف: Cd and Pb in farmland topsoil are controlled by many factors. To identify the source of potential toxic metals in the farmland topsoil around Mianyuan River, the chemical analysis and multivariate statistical analysis are performed in this study. The results indicate the following: (1) The concentration of Cd and Pb in soil exceed the background value of Chinese soil elements. (2) Cd is significantly enriched in the whole region and Pb is locally enriched, both of them are more or less influenced by human activities. (3) The contents of Cd and Pb increase significantly following the flow direction of river. (4) Pb isotope analysis indicates that the main source of Pb in the soil include the air dust, coal and phosphate plant, and the contribution of them decreases successively. (5) Linear correlation analysis and principal component analysis show that the main sources of Cd in the soil are mining phosphate rock, air dust, phosphate plant and coal mining.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5beb21f55c9f336ed534092207b4ff54Test
https://www.mdpi.com/2071-1050/13/7/3729Test