|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of dissolved organic matter on adsorption and desorption of mercury by soils显示文摘Effects of dissolved organic matter (DOM) on adsorption and desorption of Hg were investigated in two kinds of soils, Xanthi-Udic Ferralosols (XUF) and Typic Purpli-Udic Cambosols (TPUC). The DOM was obtained from humus soil (DOMH), rice straw (DOMR), and pig manure (DOMP). The presence of DOM obviously reduced Hg maximum adsorption capacity with up to 40% decreases over the control, being an order of DOMH (250.00 mg/kg)< DOMR (303.03 mg/kg) < DOMP (322.58 mg/kg) < CK (control 416.67 mg/kg) for the XUF and DOMH (270.27 mg/kg) < DOMR (312.50 mg/kg) < DOMP (324.23 mg/kg) < CK (476.11 mg/kg) for the TPUC, respectively. The inhibition of DOM on Hg adsorption was slightly weaker in XUF than in TPUC. Meanwhile, the DOM promoted Hg desorption from the soils. The kinetic models, the Two-constant equation and Elovich equation, were applicable to describe the adsorption and desorption processes of Hg in soils. The speed of Hg adsorption was consistently slowed down by the existence of DOM. | YANG, Yongkui LIANG, Li WANG, Dingyong | 2008 | Journal of Environmental Sciences2008，20，9： | 23 |
| 2 | Dynamics of total culturable bacteria and its relationship with methylmercury in the soils of the water level fluctuation zone of the Three Gorges Reservoir显示文摘Field investigations were conducted to study the temporal and spatial distribution characteristics of total culturable bacteria(TCB)and its relationship with methylmercury(MeHg)in the soils of the water level fluctuation zone of the Three Gorges Reservoir.Different altitudes(170–180,170–175,165–170 and 160–165 m)in Zhenxi(Site 1),Shibaozhai(Site 2)and Tujing(Site 3),Chongqing,China were chosen as sampling sites.Results indicated that TCB did not have significant difference in the top(0–10 cm)and sub(10–20 cm)soil of the non-inundated area(175–180 m),but showing a significant difference in the water level fluctuation zone(\175 m,suggesting that water level fluctuation had an important effect on TCB.Moreover,TCB in soils of various altitudes of Site 1 and 2had significant difference,while for Site 3,this difference was not significant.And the difference of TCB in Site 2was much greater than that in Site 1.These results suggested that there were significant differences for TCB in soils of mainstream and tributaries.In addition,TCB in soils of 10–20 cm had significant or highly significant positive correlations with MeHg level(r C 0.762,P B 0.048),thus we assumed that there may be some aerobic microorganisms playing dominant roles in mercury methylation. | Yuping Xiang Hongxia Du Hong Shen Cheng Zhang Dingyong Wang | 2014 | Chinese Science Bulletin2014，59，24： | 10 |
| 3 | Mercury in some chemical fertilizers and the effect of calcium superphosphate on mercury uptake by corn seedlings (Zea mays L.)显示文摘Mercury (Hg) contents in ten chemical fertilizers were determined, and the effect of calcium superphosphate (CSP) on the uptake and translocation of Hg in corn seedlings was investigated by pot experiments. CSP was applied at the levels of 0, 66.7, and 133.4 mg P2O5/kg to Hg-treated (2 mg/kg) and untreated soils. CSP had the highest Hg content (5.1 mg/kg), followed by the NPK compound fertilizer 15-5-5 (15% N, 5% P2O5, 5% K2O) (1.2 mg/kg), then by nitrogen fertilizers (except for ammonia sulfate) and potassium fertilizers. Application of CSP did not obviously iuence the biomass of corn roots, but it significantly increased the biomass of corn shoots in Hg-treated soil. Application of CSP at the levels of 66.7 and 133.4 mg P2O5/kg did not obviously iuence the uptake of Hg by corn seedlings on soils without Hg treatment, but it decreased the Hg uptake of corn seedlings significantly on Hg-treated soils. The transfer coefficient of Hg in corn seedlings improved slightly on soils without Hg treatment, but decreased slightly on Hg-treated soils with the application of CSP. These results implied that CSP could ameliorate Hg toxicity to corn seedlings by inhibiting the uptake and the translocation of Hg in plants on Hg-polluted soils. | Xiulan Zhao | 2010 | Journal of Environmental Sciences2010，22，8： | 5 |
| 4 | A simulation study of mercury release fluxes from soils in wet–dry rotation environment显示文摘A simulative mesocosm study was conducted to evaluate the influence of wet–dry rotation on mercury(Hg) flux from soil/water to air and the distribution of Hg species in water as well as Hg chemical fractions in soil. Three types of soil were employed including two kinds of paddy soil, Typic Purpli-Udic Cambosols(TPUC) and Xanthi-Udic Ferralosols(XUF), as well as the Alluvial Soil(AS) from Three Gorge reservoir area in Chongqing, China. The results showed that Hg fluxes in wetting periods were significantly higher than that in drying periods. It might be due to the formation of a layer of stable air over the water surface in which some redox reactions promote evasion processes over the water surface. This result indicated that more Hg would be evaporated from the Three Gorge reservoir and paddy soil field during the flooding season. Hg fluxes were positively correlated with air temperature and solar irradiation, while negatively correlated with air humidity and the electronic conductivity of water. Hg fluxes from AS and TPUC were significantly higher than that from XUF, which might be due to the higher organic matter(OM) contents in XUF than TPUC and AS. The reduction processes of oxidized Hg were restrained due to the strong binding of Hg to OM, resulting in the decrease in Hg flux from the soil. | Peng Liang Cheng Zhang Yongkui Yang Dingyong Wang | 2014 | Journal of Environmental Sciences2014，26，7： | 3 |
| 5 | Effect of dissolved organic matter on mercury release from water body显示文摘Dissolved organic matter(DOM) plays an important role in the process of mercury release from water body.In this study,the influence of DOM from different sources(DOMR,DOMS and DOMH,extracted from rice straw,compost and humic soil respectively) on mercury reduction was investigated.The molecular weight distribution and chemical composition of DOM from each source were determined using ultrafiltration membrane technique and elemental analysis respectively.The result showed that mercury release from DOM-added samples was much lower than the control;the lowest mercury release flux was observed in the treatment of DOMH,25.02% of the control,followed by DOMS and DOMR,62.46% and 64.95% of the control,respectively.The higher saturation degree and lower molecular weight of DOMH was responsible for the highest inhibition degree on the mercury release.The link between DOMH,concentration and mercury flux was also estimated and the result showed that mercury flux was increased with DOMH at lower concentration,while decreased with DOMH at higher concentration.Different mechanism dominated the influence of DOM on mercury release with variation of DOM concentration. | Yutao Zhang Xi Chen Yongkui Yang Dingyong Wang Xiao Liu | 2011 | Journal of Environmental Sciences2011，23，6： | 3 |
| 6 | Photodegradation of methylmercury in the water body of the Three Gorges Reservoir显示文摘Biogeochemical cycling of mercury in the young Three Gorges Reservoir(TGR), China, is strongly considered. Although methylmercury(MMHg) photodegradation(PD) is an important process involved in mercury cycling in this zone, little is known about this process. In situ incubation experiments were therefore performed to quantify the effect of different wavelength radiations and environmental factors on the PD process of MMHg in the water bodies of TGR. It was found that the effect of solar radiation on MMHg PD was highly dependent on wavelength and water depth. All PD-rate constants resulting from each wavelength range decreased rapidly with water depth. For surface water, UV-A radiation(320?400 nm) was the key driver, accounting for 49%?62% of MMHg PD. For the entire water column, both photosynthetically active radiation(PAR, 400?700 nm) and UV-A were responsible for MMHg PD. MMHg PD fluxes peaked in summer(7.5?18 ng m?2 d?1), followed by spring(3.3?8.0 ng m?2 d?1), autumn(1.0?2.7 ng m?2 d?1), and winter(0.060?0.15 ng m?2 d?1). The annual fluxes of MMHg PD were estimated to be 1.1?2.8 μg m?2 a?1. Filtering the reservoir water and amending it with chemicals(i.e., Cl?, NO3?, and dissolved organic matter(DOM)) showed significant effects on MMHg PD rate constants. Stepwise regression analysis showed that intensity of solar radiation, suspended particulate matter(SPM), DOM, Cl?, and NO3? were involved in the PD process. Path analysis clarified the relationship between MMHg PD rate constants and environmental variables, as well as the comparative strength of direct and indirect relationships among variables. The results are of great importance for understanding MMHg cycling characteristics in TGR and also facilitate the understanding of the underlying process, MMHg PD, in natural waters. | Rongguo Sun Dingyong Wang Wen Mao Shibo Zhao Cheng Zhang Xiang Zhang | 2015 | Science China Chemistry2015，58，6： | 3 |
| 7 | Mercury bioaccumulation in fish in an artificial lake used to carry out cage culture显示文摘As a global toxic pollutant,mercury(Hg)bioaccumulation within food chain could be influenced by human disturbance.Ten typical fish species were collected from Changshou Lake,an artificial lake used to carry out cage fish culture,to investigate the C/N isotopic compositions and Hg bioaccumulation in fish.The results showed that the total Hg(THg)and methylmercury(MeHg)levels in fish muscles((56.03±43.96)and(32.35±29.57)ng/g,wet weight),comparable with those in most studies in China,were significantly lower than the international marketing limit(0.5 mg/kg).Past human input for cage culture in this lake led to abnormal^(15)N enrichment in food chain,as the quantitative trophic levels based onδ^(15)N were different with that classified by feeding behaviors.This phenomenon subsequently demonstrated that it should be considered thoughtfully with respect to the application of the traditional method for understanding Hg bioaccumulation power by the slope of log_(10)[Hg]withδ^(15)N regression in specific water body(i.e.,Changshou Lake).In addition,no significant linear correlation between Hg and body weight or length of some fish species was observed,suggesting that the fish growth in the eutrophic environment was disproportionate with Hg bioaccumulation,and fish length or weight was not the main factor affecting Hg transfer with food web.The occurrence of human disturbance in aquatic system presents a challenge to a better understanding of the Hg bioaccumulation and biomagnification within the food chain. | Yongmin Wang Qing Xie Qinqin Xu Jinping Xue Cheng Zhang Dingyong Wang | 2019 | Journal of Environmental Sciences2019，31，4： | 2 |
| 8 | Evidence for charge and spin density waves in single crystals of La_(3)Ni_(2)O_(7) and La_(3)Ni_(2)O_(6)显示文摘Charge and spin orders are intimately related to superconductivity in copper oxide superconductors.Elucidation of the competing orders in various nickel oxide compounds is crucial,given the fact that superconductivity has been discovered in Nd_(0.8)Sr_(0.2)NiO_(2)films.Herein,we report structural,electronic transport,magnetic,and thermodynamic characterizations of single crystals of La_(3)Ni_(2)O_(7)and La_(3)Ni_(2)O_(6).La_(3)Ni_(2)O_(7)is metallic with mixed Ni^(2+)and Ni^(3+)valent states.Resistivity measurements yield two transition-like kinks at~110 and 153 K.The kink at 153 K is further revealed from magnetization and specific heat measurements,indicative of the formation of charge and spin density waves.La_(3)Ni_(2)O_(6)single crystals obtained from the topochemical reduction of La_(3)Ni_(2)O_(7)are insulating and show an anomaly at~176 K on magnetic susceptibility.The transition-like behaviors of La_(3)Ni_(2)O_(7)and La_(3)Ni_(2)O_(6)are analogous to those observed in La_(4)Ni_(3)O_(10) and La_(4)Ni_(3)O_(8),suggesting that charge and spin density waves are a common feature in the ternary La-Ni-O system with mixed-valent states of nickel. | Zengjia Liu Hualei Sun Mengwu Huo Xiaoyan Ma Yi Ji Enkui Yi Lisi Li Hui Liu Jia Yu Ziyou Zhang Zhiqiang Chen Feixiang Liang Hongliang Dong Hanjie Guo Dingyong Zhong Bing Shen Shiliang Li Meng Wang | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，1： | 2 |
| 9 | Linking the electron donation capacity to the molecular composition of soil dissolved organic matter from the Three Gorges Reservoir areas,China显示文摘Soil dissolved organic matter(DOM)plays an essential role in the Three Gorges Reservoir(TGR)as a linkage between terrestrial and aquatic systems.In particular,the reducing capacities of soil DOM influence the geochemistry of contaminants such as mercury(Hg).However,few studies have investigated the molecular information of soil DOM and its relationship with relevant geochemic al reactivities,including redox properties.We collected samples from eight sites in the TGR areas and studied the link between the molecular characteristics of DOM and their electron donation capacities(EDCs)toward Hg(II).The average kinetic rate and EDC of soil DOM in TGR areas were(0.004±0.001)hr-1 and(2.88±1.39)nmol e-/mg DOMbulk,respectively.Results suggest that higher EDCs and relatively rapid kinetics were related to the greater electron donating components of ligninderived and perhaps pyrogenic DOM,which are the aromatic constituents that influenced the reducing capacities of DOM in the present study.Molecular details revealed that even the typical autochthonous markers are important for the EDCs of DOM as well,in contrast to what is generally assumed.More studies identifying specific DOM molecular components involved in the abiotic reduction of Hg(II)are required to further understand the relations between DOM sources and their redox roles in the environmental fate of contaminants. | Tao Jiang Joeri Kaal Jiang Liu Jian Liang Yaoling Zhang Dingyong Wang | 2020 | Journal of Environmental Sciences2020，32，4： | 2 |
| 10 | Water level fluctuations influence microbial communities and mercury methylation in soils in the Three Gorges Reservoir,China显示文摘Reservoirs tend to have enhanced methylmercury(MeHg) concentrations compared to natural lakes and rivers, and water level fluctuations can promote MeHg production. Until now, little research has been conducted on the effects of microorganisms in soils for the formation of MeHg during different drying and flooding alternating conditions in the Three Gorges Reservoir(TGR). This study aimed to understand how water level fluctuations affect soil microbial composition and mercury concentrations, and if such microbial variations are related to Hg methylation. The results showed that MeHg concentrations and the ratios of MeHg to THg(MeHg%) in soils were higher in the seasonally drying and flooding alternating areas(DFAs, 175–155 m) than those in the non-inundated(NIAs, > 175 m) and inundated areas(IAs, < 145 m). However, MeHg% in all samples was less than 1%, indicating that the Hg methylation activity in the soils of the TGR was under a low level. 454 highthroughput sequencing of 16 S rRNA gene amplicons showed that soil bacterial abundance and diversity were relatively higher in DFA compared to those in NIA and IA, and microbial community composition varied in these three areas. At the family level, those groups in Deltaproteobacteria and Methanomicrobia that might have many Hg methylators were also showed a higher relative abundance in DFA, which might be the reason for the higher MeHg production in these areas. Overall, our results suggested that seasonally water level fluctuations can enhance the microbial abundance and diversity, as well as MeHg production in the TGR. | Yuping Xiang Yongmin Wang Cheng Zhang Hong Shen Dingyong Wang | 2018 | Journal of Environmental Sciences2018，30，6： | 2 |
| 11 | Refining mercury emission estimations to the atmosphere from iron and steel production显示文摘Due to its long-range transport in the atmosphere,mercury is a pollutant of global concern with health risks to humans and ecosystems worldwide(Li et al.,2012;Lindqvist et al.,1991;Liu et al.,2012a;Tang et al.,2016;Wang et al.,2015;Shao et al.,2016).Atmospheric mercury,mainly from emission from various natural and anthropogenic sources | Yongmin Wang Guangliang Liu Dingyong Wang Yong Cai | 2016 | Journal of Environmental Sciences2016，28，5： | 2 |
| 12 | Photodegradation of methylmercury in Jialing River of Chongqing, China显示文摘Photodegradation(PD) of methylmercury(MMHg) is a key process of mercury(Hg) cycling i water systems, maintaining MMHg at a low level in water systems. However, we posses little knowledge of this important process in the Jialing River of Chongqing, China. In sit incubation experiments were thus performed to measure temporal patterns and influencin factors of MMHg PD in this river. The results showed that MMHg underwent a ne demethylation process under solar radiation in the water column, which predominantl occurred in surface waters. For surface water, the highest PD rate constants were observed i spring(12 × 10-3± 1.5 × 10^(-3)m^2/E), followed by summer(9.0 × 10^(-3)± 1.2 × 10^(-3)m^2/E), autum(1.4 × 10^(-3)± 0.12 × 10^(-3)m^2/E), and winter(0.78 × 10^(-3)± 0.11 × 10^(-3)m^2/E). UV-A radiatio(320–400 nm), UV-B radiation(280–320 nm), and photosynthetically active radiation(PAR400–700 nm) accounted for 43%–64%, 14%–31%, and 16%–45% of MMHg PD, respectively. PD rat constants varied substantially with the treatments that filtered the river water and amended with chemicals(i.e., Cl-, NO_3^-, dissolved organic matter(DOM), Fe(III)), which reveals tha suspended particulate matter and water components are important factors in affecting the PD process. For the entire water column, the PD rate constant determined for each wavelengt range decreased rapidly with water depth. UV-A, UV-B, and PAR contributed 27%–46%, 6.2%12%, and 42%–65% to the PD process, respectively. PD flux was estimated to be 4.7 μg/(m^2·yea in the study site. Our results are very important to understand the cycling characteristics o MMHg in the Jialing River of Chongqing, China. | Rongguo Sun Dingyong Wang Wen Mao Shibo Zhao Cheng Zhang | 2015 | Journal of Environmental Sciences2015，27，6： | 2 |
| 13 | Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2显示文摘Vanadium dichalcogenides have attracted increasing interests for the charge density wave phenomena and possible ferromagnetism.Here,we report on the multiphase behavior and gap opening in monolayer VTe2 grown by molecular beam epitaxy.Scanning tunneling microscopy(STM)and spectroscopy study revealed the(4×4)metallic and gapped(2√3×2√3)charge-density wave(CDW)phases with an energy gap of≈40 meV.Through the in-plane condensation of vanadium atoms,the typical star-of-David clusters and truncated triangle-shaped clusters are formed in the(4×4)and(2√3×2√3)phases respectively,resulting in different surface morphologies and electronic structures as confirmed by density functional theory(DFT)calculations with on-site Coulomb repulsion.The CDW-driven reorganization of the atomic structure weakens the ferromagnetic superexchange coupling and strengthens the antiferromagnetic exchange coupling on the contrary,suppressing the long-range magnetic order in monolayer VTe2.The electron correlation is found to be important to explain the gap opening in the(2√3×2√3)phase. | Meizhuang Liu Changwei Wu Zizhao Liu Zhiqiang Wang Dao-Xin Yao Dingyong Zhong | 2020 | Nano Research2020，13，6： | 2 |
| 14 | Mercury fluxes from air/surface interfaces in paddy field and dry land显示文摘 | Jinshan Zhu Dingyong Wang Xiao Liu Yutong Zhang | 2010 | Applied Geochemistry2010，，2： | 1 |
| 15 | Roles of chloride ion in photo-reduction/oxidation of mercury显示文摘Photo-reduction of divalent mercury(Hg(II)) in aquatic systems plays a key role in global biogeochemistry cycling of mercury(Hg) in the Earth's surface environment. The mechanisms of this process with various Clconcentrations([Cl-]) under different pH values and irradiation wavelength ranges are still unclear. In this work,photo-reduction and photo-oxidation experiments of Hg with different [Cl-] and pH values under various light conditions were conducted. The results show that photoreduction rate constants of Hg(II) decrease with the increasing of [Cl-] in neutral solution under full light spectrum. Photo-reduction rate constants of Hg(II) with Cl-is highly dependent on Hg(II) species, which is determined by [Cl-] and pH value. Irradiation wavelength ranges have significant effects on reaction processes of photo-reduction of Hg(II) and photo-oxidation of Hg(0) in the presence of Cl-. When cut off ultraviolet(UV) radiation(280–400 nm), the reduction rate constants decrease without Cl-, and increase with higher [Cl-], and the photooxidation rates of Hg(0) decrease with or without Cl-.Except Cl-complexation stabilize the reducible Hg ions in solutions, photo-oxidation is an important reason for Cllowering photo-reduction rate of Hg(II). The results are of great importance for understanding the photo-redox characters of Hg(II) with Cl-. | Rongguo Sun Dingyong Wang Wen Mao Shibo Zhao Cheng Zhang | 2014 | Chinese Science Bulletin2014，59，27： | 1 |
| 16 | Wet deposition fluxes of total mercury and methylmercury in core urban areas, Chongqing, China显示文摘 | Yongmin Wang Yulong Peng Dingyong Wang Cheng Zhang | 2014 | Atmospheric Environment2014，，： | 1 |
| 17 | Estimation of mercury emission from different sources to atmosphere in Chongqing, China显示文摘 | Dingyong Wang Lei He Shiqiang Wei Xinbin Feng | 2005 | Science of the Total Environment2005，，2： | 1 |
| 18 | Monitoring of atmospheric heavy metal deposition in Chongqing, China: based on moss bag technique 显示文摘 | Sun Shouqin Wang Dingyong He Ming | 2008 | Environ Monit Assess2008，148，： | 1 |
| 19 | Release flux of mercury from different environmental surfaces in Chongqing, China 显示文摘 | WANG Dingyong HE Lei SHI Xiaojun | 2006 | Chemosphere2006，64，11： | 1 |
| 20 | Abundance and distribution of meiofauna in the Chukchi Sea显示文摘The metazoan meiofauna in the Chukchi Sea were collected from seven shallow water stations(depths ranging 46 to 52 m) and five deep sea stations(depths ranging between 393 and 2 300 m) during the 4th Chinese National Arctic Research Expedition in 2010. The results showed that abundance of meiofauna was higher in shallow water sediments(average of 2 445 ind./(10 cm2)) than in deep sea sediments(407.06 ind./(10 cm2)). A UNIANOVA test for difference between the two different regions was highly significant(F=101.15, p<0.01). Nematodes were numerically dominant, representing(96.6±4.6)% of the total meiofaunal abundance at the shallow water stations and(98.90±1.42)% at deep sea stations. The number of higher taxonomic groups and abundance of meiofauna were higher at Stas CC1, CC4, and R06 near the Bering Strait and the continent, than at the rest of the shallow water and deep sea stations. The primary factors causing the differences were concentrations of nutrients P and Si of bottom seawater(R=0.831, p<0.003), followed by depth(R=-0.655, p<0.05) and sand fractions of sediments(R=0.632, p <0.05). The numbers of meiofauna on the 65 μm and 32 μm sieves were significantly higher than those on the rest of the screens. Differences in numbers of meiofauna retained on screens with different mesh openings were highly significant among all sampling stations(F=31.60, p<0.01). The highest numbers of individuals on screens with 32 μm mesh openings were found at deep sea stations. The number of meiofauna in the top 0–1, 1–2, and 2–4 cm segments constituted 84.4% of the total and was significantly higher than those in the bottom 4–6 and 6–10 cm segments(F=15, p<0.01). | LIN Rongcheng HUANG Dingyong GUO Yuqing CHANG Yu CAO Yinkun WANG Jianjia | 2014 | Acta Oceanologica Sinica2014，33，6： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员