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Environmental colloid behaviors of humic acid-Cadmium nanoparticles in aquatic environments

Journal of Environmental Sciences 2025年第3期149卷 663-675页

作者： Ruyi Zheng Jian Zhu Peng Liao Dengjun Wang PanWu Wenjian Mao Yuqin Zhang Weiwei Wang College of Resources and Environment Engineering Key Laboratory of Karst Georesources and EnvironmentMinistry of EducationGuizhou UniversityGuiyang 550025China Guizhou Karst Environmental Ecosystems Observation and Research Station Ministry of EducationGuizhou UniversityGuiyang 550025China State key laboratory of Environmental geochemistry Institute of GeochemistryChinese Academy of ScienceGuiyang 550081China School of Fisheries Aquaculture and Aquatic SciencesAuburn UniversityAuburnAL 36849USA

Humic acid(HA),a principal constituent of natural organic matter(NOM),manifests ubiquitously across diverse ecosystems and can significantly influence the environmental behaviors of Cd(II)in aquatic *** studies on NOM-Cd(II)interactions have primarily focused on the immobilization of Cd(II)solids,but little is known about the colloidal stability of organically complexed Cd(II)particles in the *** this study,we investigated the formation of HA-Cd(II)colloids and quantified their aggregation,stability,and transport behaviors in a saturated porous media representative of typical subsurface *** from batch experiments indicated that the relative quantity of HA-Cd(II)colloids increased with increasing C/Cd molar ratio and that the carboxyl functional groups of HA dominated the stability of HA-Cd(II)*** results of correlation analysis between particle size,critical aggregation concentration(CCC),and zeta potential indicated that both Derjaguin-Landau-Verwey-Overbeek(DLVO)and non-DLVO interactions contributed to the enhanced colloidal stability of HA-Cd(II)*** results further confirmed that the stable HA-Cd(II)colloid can transport fast in a saturated media composed of clean ***,this study provides newknowledge of the colloidal behaviors of NOM-Cd(II)nanoparticles,which is important for better understanding the ultimate cycling of Cd(II)in aquatic systems.

关键词： HA-Cd(II)colloids Colloid formation Colloid aggregation Transport

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Atmospheric CO_(2) Removal Efficiency through Enhanced Silicate Weathering in Croplands:A Review with Emphasis on the Contribution of Fungi

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Journal of Earth Science 2025年第1期36卷 197-211页

作者： Zi-Bo Li Gaojun Li Jonathan M.Adams Dong-Xing Guan Liang Zhao Rongjun Bian Qing Hu Xiancai Lu Junfeng Ji Jun Chen State key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China key laboratory of surficial geochemistry Ministry of EducationSchool of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China Institute of Soil and Water Resources and Environmental Science College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Institute of Resource Ecosystem and Environment of AgricultureNanjing Agricultural UniversityNanjing 210095China Xiong'an Institute of Innovation Chinese Academy of SciencesXiong'an 071700China

Enhanced silicate weathering(ESW)is a geoengineering method aimed at accelerating carbon dioxide(CO_(2))removal(CDR)from atmosphere by increasing the weathering flux of silicate rocks and *** has emerged as a promising strategy for *** studies underscore ESW’s substantial potential for CDR and its diverse benefits for crops when applied to ***,the well-known significant discrepancies in silicate weathering rates between laboratory and field conditions introduce uncertainty in CDR through *** compiling data from recent literature,we calculated and compared CDR efficiency(t CO_(2)t^(-1)_(silicate)ha^(-1)y^(-1))observed in mesocosm experiments and field *** findings indicate that CDR efficiencies in field trials are comparable to or exceeding that observed in mesocosm experiments by 1-3 orders of magnitude,particularly evident with wollastonite *** hierarchy of CDR efficiency among silicates suitable for ESW is ranked as follows:olivine≥wollastonite>basalt>albite≥*** suggest the potential role of biota,especially fungi,in contributing to higher CDR efficiencies observed in field trials compared to mesocosm *** further emphasize introducing fungi known for their effectiveness in silicate weathering could potentially enhance CDR efficiency through ESW in *** before implementing fungal-facilitated ESW,three key questions need addressing:(i)How does the community of introduced fungi evolve over time?(ii)What is the long-term trajectory of CDR efficiency following fungal introduction?and(iii)Could fungal introduction lead to organic matter oxidation,resulting in elevated CO_(2)emissions?These investigations are crucial for optimizing the efficiency and sustainability of fungal-facilitated ESW strategy.

关键词： enhanced weathering carbon dioxide removal efficiency fungi weathering rate altered surface layers

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Compositions and Distributions of Secondary Organic Aerosols and Their Tracers over the Pearl River Estuary Region Influenced by Continental and Marine Air Masses

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Advances in Atmospheric Sciences 2025年第4期42卷 682-696页

作者： Zhenhao LING Junlin HUANG Liqing WU Yee Jun THAM Guizhen FANG Bing WU Lili MING Xuemei WANG Xiang DING School of Atmospheric Sciences Sun Yat-sen UniversityKey Laboratory of Tropical Atmosphere-Ocean SystemMinistry of Educationand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiangChina School of Marine Sciences Sun Yat-sen UniversityZhuhaiChina Technical Center of Gongbei Customs District of China ZhuhaiChina College of Environment and Climate Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental QualityJinan UniversityGuangzhouChina Guangzhou Institute of geochemistry Chinese Academy of SciencesGuangzhouChina

The compositions and distributions of monoterpenes,isoprene,aromatics and sesquiterpene SOA tracers(SOAM,SOAI,SOAA and SOAS,respectively)at an island site(Da Wan Shan Island,DWS)were investigated in the context of the influence of continental and marine air masses over the Pearl River Estuary(PRE)region in winter *** sum concentration of SOA tracers was 6.2–132.8 ng m^(−3),with SOAM and SOAI as the main components in both continental(scenarios A1 and A2)and marine air masses(scenario A3),as well as their combination(scenario A4).The highest and lowest levels of SOAM were observed in A1 and A3,respectively,which were mainly related to the variations in meteorological conditions,precursor concentrations,and the degree of photochemical *** MBTCA/HGA(3-methyl-1,2,3-butanetricarboxylic acid/3-hydroxyglutaric acid)ratios suggested a less significant contribution fromα-pinene to *** variations of SOAI in the different scenarios were associated with differences in relative humidity,particle acidity,and isoprene/NOx *** respective highest and lowest concentrations of aromatics SOA tracers in A1 and A3 revealed the influence of anthropogenic precursors from upwind continental areas,which was confirmed by the correlation among biogenic and anthropogenic *** results of the tracer-based-method suggested dominant contributions of SOAs from aromatics and monoterpenes,with the highest concentrations in A1.A WRF-Chem simulation revealed that the SOAs from the above precursors only contributed 12%–25%to the total SOA at DWS,while the spatial distributions of SOAs further highlighted that the abundance of SOAs over the PRE region in winter is highly associated with air masses transported from upwind continental areas.

关键词： secondary organic aerosols tracers continental and marine air masses Pearl River Estuary region

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Mass organic matter accumulation induced by rapid redox variations in lakes:Evidence from the Miaoxi area,Bohai Bay Basin,China

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Journal of Palaeogeography 2025年第01期14卷 291-313页

作者： Peng Sun Hai-Feng Yang Fei-Long Wang Jun-Pei Yue Yan-Fei Gao You-Jun Tang School of Petroleum Engineering Yangtze University key laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Yangtze University Tianjin Branch of China National Offshore Oil Corporation College of Resource and Environment Yangtze University

The Member 4 of the Paleogene Shahejie Formation(Es4) in the Bohai Bay Basin is interspersed with a set of high-quality source rocks typified as intercalation of red and black mudstones. A large amount of petroleum(crude oil) originates from these source rocks. The Paleocene-Eocene Thermal Maximum(PETM)event occurred during the deposition of Es4 in the Bohai Bay Basin, and the organic matter enrichment model under this event is worth further investigation due to its relationship with and influence on petroleum accumulations. Well LK25-A, as the first oil exploration well drilled into the Es4 in Miaoxi area, serves as a valuable case to study organic matter accumulation. In this study, we integrate total organic carbon(TOC),Rock-Eval pyrolysis, microscopic observation, vitrinite reflectance(VRo), elemental analysis, and gas chromatography-mass spectrometry(GC-MS) to evaluate the hydrocarbon generation potential, organic matter types, thermal maturity, and sedimentary environment of the Es4 in Miaoxi area. The analysis of maceral and rock pyrolysis data reveals that Type I and Type II organic matter make up the majority of Paleogene mudstones in this region. The TOC and rock pyrolysis data show that mudstones in this area have high organic matter abundance and oil-generation potential. The measured vitrinite reflectance distribution of mudstone samples, which ranges from 0.3% to 0.74%, demonstrates that the Paleogene strata are at the immature to mature stage, and the samples from this area contain a sizable amount of bituminite and mineralbituminous groundmass. The analysis of biomarkers in the mudstone samples indicates that most of the mudstones in this area are in lacustrine and brackish-hypersaline lacustrine environment under a reducing condition, and some of the red mudstones in the Es4 are formed under a suboxic condition. Based on the size and morphology of the pyrite framboid, the redox conditions of the water mass during deposition or diagenesis are further

关键词： Hydrocarbon generation potential Biomarkers Optical microscopy Pyrite framboid Elemental geochemistry Red–black beds

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An EXAFS investigation of the mechanism of competitive sorption between Co(Ⅱ) and Ni(Ⅱ) at γ-alumina/solution interface

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Acta Geochimica 2017年第3期36卷 462-464页

作者： Wenxian Gou Junfeng Ji Wei Li key laboratory of surficial geochemistry Ministry of Education School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China

Co(Ⅱ)and Ni(Ⅱ)are two common toxic heavy metals,and may simultaneously exist in contaminated water,soil,and sediment systems in Earth’s surface *** this circumstance,competitive adsorption between the two metals may influence their migration,toxicity,and *** this research,the competitive sorption of Co(Ⅱ)and Ni(Ⅱ)on γ-Al_2O_3was studied using both macroscopic sorption experiments and extended X-ray absorption fine structure(EXAFS)*** suggest that Ni(Ⅱ)reduced the amount of Co(Ⅱ)sorption in a binary-solute system at pH *** is because both Co(Ⅱ)and Ni(Ⅱ)form inner-sphere surface complexes during sorption on γ-Al_2O_3and compete for the surface reactive ***,Co(Ⅱ)exhibited a negligible influence on sorption amount of Ni(Ⅱ)under the same conditions,which suggests Ni(Ⅱ)has a stronger affinity to alumina *** pH 7.5,Co(Ⅱ)and Ni(Ⅱ)sorption density were much higher than that at pH 6.0,but there no mutual competitive effect was *** analysis further revealed that formation of layered double-hydrated precipitates was the dominant sorption mechanism for both Co(Ⅱ)and Ni(Ⅱ)at pH *** this type of sorption does not rely on surface reactive sites,there was no competition between Co(Ⅱ)and Ni(Ⅱ).This finding sheds light on risk assessment and remediation of Ni/Co pollution.

关键词： Co(Ⅱ) Ni(Ⅱ) γ-Al2O3 Competitive sorption EXAFS

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Review of the uncertainty analysis of groundwater numerical simulation

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Chinese Science Bulletin 2013年第25期58卷 3044-3052页

作者： WU JiChun ZENG XianKui key laboratory of surficial geochemistry Ministry of Education Department of Hydrosciences School of Earth Sciences and EngineeringState Key Laboratory of Pollution Control and Resource Reuse Nanjing University

Groundwater system is a complex and open system, which is affected by natural conditions and human activities. Natural hydrological processes is conceptualized through relatively simple flow governing equations in groundwater models. Moreover, observation data is always limited in field hydrogeological conditions. Therefore, the predictive results of groundwater simulation often deviate from true values, which is attribute to the uncertainty of groundwater numerical simulation. According to the process of system simulation, the uncertainty sources of groundwater numerical simulation can be divided into model parameters, conceptual model and observation data uncertainties. In addition, the uncertainty stemmed from boundary conditions is sometimes refered as scenario uncertainty. In this paper, the origination and category of groundwater modeling uncertainty are analyzed. The recent progresses on the methods of groundwater modeling uncertainty analysis are reivewed. Furthermore, the researches on the comprehensive analysis of uncertainty sources, and the predictive uncertainty of model outputs are discussed. Finally, several prospects on the deveolpment of groundwater modeling uncetainty analysis are proposed.

关键词：地下水数值模拟不确定性分析地下水模型水文地质条件定性分析方法开放系统观测数据预测模型

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Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source

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Science China Earth Sciences 2019年第9期62卷 1428-1440页

作者： Wancang ZHAO Lianwen LIU Jun CHEN Junfeng JI Chongqing key laboratory of Karst Environment School of Geographical Sciences Southwest University Chongqing 400715 China ministry of education key laboratory of surficial geochemistry School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China

Mineral dust released from the desert is one of the important components of atmospheric aerosols. Arid and semi-arid deserts, sandy lands in northern China and their adjacent Gobi Desert lands in northern China and neighboring Mongolia(hereinafter referred to as Gobi) are potential sources of mineral dust in Asia. However, there is currently a lack of systematic studies on the characteristics of major elements in the potential mineral dust source area. This study investigates the major elements of 310 surficial sand samples in the stabilized and semi-stabilized dune fields from 12 deserts/sandy land and Gobi in northern China and southern Mongolian Gobi and compiles published data. We identify four regions with distinct geochemical characteristics:(1) Taklimakan, Kumtag and Qaidam deserts in western China;(2) Badain Jaran, Tengger, Hobq, and Mu Us deserts in the central and western regions of northern China;(3) Hulun Buir, Onqin Daga and Horqin sandy lands in northeast China;and(4) Gobi and Gurbantunggut deserts. The spatial distributions of the SiO2 and CaO contents in Chinese deserts are highly variable. The average content of SiO2 generally reflects an increasing trend from west to east, while the average content of CaO shows a decreasing trend from west to east. We demonstrate that the spatial variation of major elements is likely controlled by two key scenarios: the composition of source rocks and the mineral maturity caused by the supply of fresh materials. The SiO2/(Al2O3+K2O+Na2O) ratio of desert sediments is relatively lower in western China and may be caused by high ferricmagnesia and high carbonate minerals;this ratio is relatively higher in the northeast sandy lands and may be linked to a lack of fresh material supply and the presence of high K-feldspar minerals in source rocks. The deserts can be further distinguished by ternary diagrams with SiO2/10-CaO-Al2O3,(K2O+Na2O)-CaO-Fe2O3 and CaO-Na2O-K2O. The comparison of major elements between desert sedimen

关键词： Desert Loess Major elements Eolian Dust Carbonate

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A review of cadmium sorption mechanisms on soil mineral surfaces revealed from synchrotron-based X-ray absorption fine structure spectroscopy:Implications for soil remediation

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Pedosphere 2021年第1期31卷 11-27页

作者： Xinxin MO Matthew G.SIEBECKER Wenxian GOU Ling LI Wei LI key laboratory of surficial geochemistry Ministry of EducationSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Department of Plant and Soil Science Texas Tech UniversityLubbock TX 79409(USA) State key laboratory of Environmental geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

The sorption of cadmium(Cd) is one of the most important chemical processes in soil, affecting its fate and mobility in both soil and water and ultimately controlling its bioavailability. In order to fundamentally understand the sorption/desorption of Cd in soil systems, X-ray absorption fine structure spectroscopy(XAFS) has been applied in numerous studies to provide molecular-level information that can be used to characterize the surface adsorption and precipitation reactions that Cd can undergo. This information greatly improves our current knowledge of the possible chemical reactions of Cd in soil. This paper critically reviews the mechanisms of Cd sorption/desorption at the mineral-water interface based on XAFS studies performed over the past twenty years. An introduction to the basic concepts of sorption processes is provided, followed by a detailed interpretation of XAFS theory and experimental data collection and processing,ending finally with a discussion of the atomic/molecular-scale Cd sorption mechanisms that occur at the soil mineral-water interface. Particular emphasis is placed on literature that discusses Cd adsorption and speciation when associated with iron, manganese, and aluminum oxides and aluminosilicate *** sorption mechanisms by which Cd is sorbed by these minerals have been found, spanning from outer-sphere to inner-sphere to surface precipitation,depending on mineral type, surface loading, and pH. In addition, the application of complementary techniques(e.g.,113 Cd nuclear magnetic resonance(NMR) and molecular dynamics simulation) for probing Cd sorption mechanisms is discussed. This review can help to develop appropriate strategies for the environmental remediation of Cd-contaminated soils.

关键词： aluminosilicate minerals aluminum oxide bioavailability heavy metal iron oxide manganese oxide mineral-water interface molecular-scale sorption mechanisms

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Organic carbon isotope and molecular fossil records of vegetation evolution in central Loess Plateau since 450 kyr

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Science China Earth Sciences 2016年第6期59卷 1206-1215页

作者： ZHOU Bin WALI Guzalnur Francien PETERSE Michael I BIRD key laboratory of surficial geochemistry (ministry of education) School of Earth Sciences and Engineering Nanjing University Utrecht University Department of Earth Sciences College of Science Technology and Engineering and Centre for Tropical Environmental and Sustainability Science James Cook University

Significant uncertainties remain regarding the temporal evolution of natural vegetation during the Quaternary, and drivers of past vegetation change, on the Chinese Loess Plateau （CLP）. This study presents analyses of total organic carbon isotopic composition （TOC） and n-alkane ratios （C31/C27） from the Lingtai loess-palaeosol sequence on the central CLP over the last 450 kyr. The results demonstrate that the vegetation in this region comprised a mix of C3 and C4 plants of herb and woody growth-form. C3 plants dominated for most of the last 450 kyr, but this did not lead to extensive forest. C3 woody plants were more abundant in MIS9 （S3 period） and MIS5 （S 1 period） during warm and humid climate conditions. Herbs increased in the region since 130 kyr, possibly as a result of increased aridity. On the orbital timescales, there was a reduction of C3 herbal plants in MIS 11 （$4） than in M1S 12 （L5）, and in Holocene than in the last glacial period. Our isotope and n-alkane proxy records are in agreement with Artemisia pollen changes in the region, which is/was the dominant species in this area and varying due to different heat and water conditions between glacial and interglacial periods. Though the climate in MIS1 （SO） was similar to that in MIS11 （S4）, a significant increase in woody plants during the Holocene suggests the impact of human activities and ecological effects of changes in fire activity.

关键词： Carbon isotopic composition Leaf wax lipids C3/C4 variations Late Quaternary vegetation change Glacial/interglacial cycles

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A Comparative Study on Hydrodynamics and Hydrochemistry Coupled Simulations of Drainage Pipe Crystallization Blockage in Karst Tunnels

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Journal of Earth Science 2022年第5期33卷 1179-1189页

作者： Dian-Guang Liu Yun Yang Cheng-Jun Mao Jian-Feng Wu Ji-Chun Wu School of Earth Sciences and Engineering Hohai UniversityNanjing211100China key laboratory of surficial geochemistry Ministry of EducationDepartment of HydrosciencesSchool of Earth Sciences and EngineeringNanjing UniversityNanjing210023China

Drainage pipe system is the requisite component of the traffic tunnels in Karst *** reveal the dynamic process of crystallization blockage in drainage pipes,a novel hydrodynamics and hydrochemistry coupled simulation model was developed for calculating the deposition rate of CaCO_(3) fouling in pipeline *** adhering to the pipe walls involve a deformable domain with moving geometric boundaries,and moving mesh and level set methods are proposed for simulation of for tunnel turbulence and crystallization fouling *** simulation results are compared with the experimental results showing similar *** effects of temperature,flow velocity,and solution concentration on crystallization blockage were analyzed by comparative simulation *** simulation results show that:(1)the moving mesh method simulated nozzle shrinkage caused by crystalline deposition,without accounting for geometric topology shape ***,the level set method tracked the moving topology and thus can simulate the process of complete blockage;(2)the flow velocity in the longitudinal pipe generally exceeded that in the transverse pipe,and the CaCO_(3) crystal concentration in the transverse pipe eclipsed that in the longitudinal pipe,which meant crystallization blockages primarily occurred in the transverse pipe;(3)the temperature and concentration correlated positively with the crystallization rate,while the crystal precipitation value decreases with the increasing of inlet flow velocity *** study advances a hydrodynamics and hydrochemistry coupled crystallization blockage model to provide technical support for the early identification of crystallizationinduced pipe blockage in the drainage system in karst tunnel sites.

关键词： karst tunnel crystallization blockage numerical simulation moving mesh level set engineering geology

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