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Effects of fulvic acid and humic acid from different sources on Hg methylation in soil and accumulation in rice

Journal of Environmental Sciences 2022年第9期34卷 93-105页

作者： Shu Ran tianrong he Xian Zhou Deliang Yin Key Laboratory of Karst Georesources and Environment(Guizhou University) Ministry of EducationGuiyang 550025China College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China Guizhou Karst Environmental Ecosystems Observation and Research Station Ministry of EducationGuiyang 550025China

Humus is often used as an organic modifier to reduce the bioaccumulation of heavy metals in plants, but the effects of different humus components from different sources on the fate of mercury(Hg) in paddy fields are still unclear. here, fulvic acid(FA) and humic acid(HA) extracted from composted straw(CS), composted cow dung(CCD), peat soil(PM) and lignite coal(LC) were used to understand their effects on the methylation and bioaccumulation of Hg in paddy soil by pot experiments. Amendments of both FA and HA largely increased the abundance of Hg-methylating microbes and low-molecular-weight organic matters(e.g, cysteine) in paddy soil. They were also found to change the aromaticity, molecular size and Chromophoric DOM concentration of DOM, and resulted in heterogeneous effects on migration and transformation of Hg. All the FA-amended treatments increased the mobility and methylation of Hg in soil and its absorption in roots. Nevertheless, FA from different sources have heterogeneous effects on transport of Hg between rice tissues. FA-CCD and FA-PM promoted the translocation of Me Hg from roots to rice grains by 32.95% and 41.12%, while FA-CS and FA-LC significantly inhibited the translocation of inorganic Hg(IHg) by 52.65% and 66.06% and of Me Hg by 46.65% and 36.23%, respectively. In contrast, all HA-amended treatments reduced the mobility of soil Hg, but promoted Hg methylation in soil. Among which, HA-CCD and HA-PM promoted the translocation of Me Hg in rice tissues by 88.95% and 64.10%, while its accumulation in rice grains by 28.43% and 28.69%, respectively. In general, the application of some FA and HA as organic modifiers to reduce Hg bioaccumulation in rice is not feasible.

关键词： Humic acid Fulvic acid Methylmercury Accumulation Rice

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Effects of soil properties on production and bioaccumulation of methylmercury in rice paddies at a mercury mining area,China

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Journal of Environmental Sciences 2018年第6期30卷 194-205页

作者： Deliang Yin tianrong he Runsheng Yin Lingxia Zeng The Key Laboratory of Karst Environment and Geohazard Prevention Guizhou University Guiyang 550003 China College of Resources and Environments Southwest University Chongqing 400715 China State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Department of Civil and Environmental Engineering Environmental Chemistry and Technology Program University of Wisconsin-Madison Madison WI 53706 USA

Rice paddy soil is recognized as the hotspot of mercury（Hg） methylation, which is mainly a biotic process mediated by many abiotic factors. In this study, effects of key soil properties on the production and bioaccumulation of Hg and methylmercury（MeHg） in Hg-contaminated rice paddies were investigated. Rice and soil samples were collected from the active Hg smelting site and abandoned Hg mining sites（a total of 124 paddy fields） in the Wanshan Mercury Mine, China. Total Hg（THg） and MeHg in soils and rice grains, together with sulfur（S）,selenium（Se）, organic matter（OM）, nitrogen（N）, phosphorus（P）, mineral compositions（e.g., SiO2, Al2O3 and Fe2O3） and pH in soils were quantified. The results showed that long-term Hg mining activities had resulted in THg and MeHg contaminations in soil-rice system. The newly-deposited atmospheric Hg was more readily methylated relative to the native Hg already in soils, which could be responsible for the elevated MeHg levels in soils and rice grains around the active artificial Hg smelting site. The MeHg concentrations in soils and rice grains showed a significantly negative relationship with soil N/Hg, S/Hg and OM/Hg ratio possibly due to the formation of low-bioavailability Hg–S（N）–OM complexes in rhizosphere. The Hg–Se antagonism undoubtedly occurred in soil-rice system, while its role in bioaccumulation of MeHg in the MeHg-contaminated rice paddies was minor. However, other soil properties showed less influence on the production and bioaccumulation of MeHg in rice paddies located at the Wanshan Mercury Mine zone.

关键词： Rice paddy Physicochemical property Mercury mining area Mercury Methylmercury Bioaccumulation factors

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Effects of sulfate-reducing bacteria on methylmercury at the sediment–water interface

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Journal of Environmental Sciences 2016年第8期28卷 214-219页

作者： Lingxia Zeng Guangjun Luo tianrong he Yanna Guo Xiaoli Qian Key Laboratory of Karst Environment and Geohazard Prevention Guizhou University Guiyan9 550003 China Power China Guiyang Engineering Corporation Limited Guiyang 550081 China The School of Resources and Environment Engineering Guizhou University Guiyang 550003 China

Sediment cores（containing sediment and overlying water） from Baihua Reservoir（SW China）were cultured under different redox conditions with different microbial activities, to understand the effects of sulfate-reducing bacteria（SRB） on mercury（Hg） methylation at sediment–water interfaces. Concentrations of dissolved methyl mercury（DMe Hg） in the overlying water of the control cores with bioactivity maintained（BAC） and cores with only sulfate-reducing bacteria inhibited（SRBI） and bacteria fully inhibited（BACI） were measured at the anaerobic stage followed by the aerobic stage. For the BAC and SRBI cores, DMe Hg concentrations in waters were much higher at the anaerobic stage than those at the aerobic stage, and they were negatively correlated to the dissolved oxygen concentrations（r =- 0.5311 and r =- 0.4977 for BAC and SRBI, respectively）. The water DMe Hg concentrations of the SRBI cores were 50% lower than those of the BAC cores, indicating that the SRB is of great importance in Hg methylation in sediment–water systems, but there should be other microbes such as iron-reducing bacteria and those containing specific gene cluster（hgc AB）, besides SRB,causing Hg methylation in the sediment–water system.

关键词： Methyl mercury Sediment–water interface Microbial activity Redox condition Sulfate-reducing bacteria

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The impact of sulfate reduction on the distribution of methylmercury in reservoirs in the city of Guiyang

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Chinese Journal Of Geochemistry 2013年第1期32卷 104-109页

作者： he tianrong LI Ting Yang Ruidong LUO Guangjun LANG Xiaofang An Yanling YAN Haiyu Key Laboratory of Karst Environment and Geohazard Prevention Guizhou University State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences

In this paper, the relationship between sulfate reduction potential and mercury methylation potential was studied in the Aha, Baihua and Hongfeng reservoirs from Guiyang City. The methylmercury (MeHg) concentrations of lake water in the Aha Reservoir were greatly elevated as compared to those of the Hongfeng and Baihua reservoirs, which was correlated with its distinctly high SRB abundance, SO42-, and S2- concentrations. Among the three reservoirs, however, the highest MeHg was observed in in the top several centimenters of pore water profile in the Hongfeng Reservoir where the lowest S2- in pore water occurred. The distributions of MeHg in lake water and pore water showed the highest methylation potential occurred at water-sediment surface for the Aha Reservoir and the in the top several centimenters of sediments for the Hongfeng Reservoir. It is guessed that the highest mercury methylation only occurs at the sites with certain sulfide concentrations.

关键词：硫酸盐还原菌阿哈水库甲基汞贵阳市红枫湖甲基化水浓度孔隙水

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Application of Induced Pluripotent Stem Cells Derived from Human Periodontal Ligament Cells in Bone Regeneration

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Wuhan University Journal of Natural Sciences 2020年第5期25卷 404-410页

作者： he tianrong YAN Qi WU Xinyu SHI Bin LIN Yi Shengli Clinical College of Fiyian Medical University Fujian Provincial HospitalFuzhou 350001FujianChina School of Stomatology Wuhan UniversityWuhan 430072HubeiChina

The purpose of this study was to primarily culture human periodontal ligament cells(hPDLCs)and to reprogram hPDLCs with exogenous genes via a lentivirus-mediated transfection *** induced pluripotent stem cells derived from h PDLCs(hPDLC-iPSCs)were *** red staining was used to observe the formation of mineralized nodules and real-time Polymerase Chain Reaction(PCR)was used to detect the expression of osteogenic *** the in vivo experiment,nude mouse skull defect models were established and cell sheets were made to repair the bone *** reprogrammed cells were positive for alkaline phosphatase(ALP)staining and embryonic stem cells(ESCs)-specific proteins,and could form *** osteogenic induction,alizarin red staining showed that the number of mineralized nodules in the h PDLC-i PSCs group was more and the osteogenic related factors ALP,osteocalcin(OCN),Col-I and Runx2 were also expressed higher in *** hPDLC-iPSC cell sheets were all successfully *** analysis showed that the h PDLC-i PSC cell sheet got new bone *** results demonstrated that hPDLC-iPSCs were successfully generated from human periodontal ligament fibroblasts and hPDLC-iPSC cell sheets provided new options for bone tissue engineering.

关键词： induced pluripotent stem cells(iPSCs) osteogenesis cell sheet bone defect periodontal tissue regeneration

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Distribution and speciation of mercury in the Hongfeng Reservoir,Guizhou Province, China

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Chinese Journal Of Geochemistry 2008年第1期27卷 97-103页

作者： he tianrong FENG Xinbin GUO Yanna QIU Guangle YAN Haiyu MENG Bo State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Graduate School of the Chinese Academy Sciences Beijing 100039 China

The water, pore water, sediment, and fish samples were collected from the Hongfeng Reservoir in No- vember 2003 and February 2004 in accordance with trace metal protocols. The average concentrations of total mer- cury (THg), dissolved mercury (DHg), reactive mercury, dissolved gaseous mercury, total methylmercury, and dis- solved methylmercury in the water columns were 8.00, 5.70, 0.63, 0.05, 0.16, and 0.07 ng/L, respectively. THg and DHg in the water columns, THg in pore water and THg in lake sediments of the Hongfeng Reservoir showed the level of mercury in the Hongfeng Reservoir was higher than in other natural waters in the world due to the loading of a lot of waste water with relatively high concentrations of mercury, whereas methylmercury concentrations in fish (wet weight) varied from 1.73–51.00 ng/g, much lower than in most remote lakes and reservoirs reported in northern Europe and North America. Methylmercury distributions in pore water and sediments showed methylation oc- curred mainly in the upper several centimeters of sediment cores in the Hongfeng Reservoir. The concentrations of dissolved organic carbon, total suspended particles, total Hg, and methylmercury were higher at Houwu than those at Daba in November 2003. It is suggested that other pollutants such as N and P from fishing farm and other waste water at Houwu,which resulted in deterioration of water quality, affected the concentrations and distributions of mercury species in the reservoir.

关键词：水银物种生物环境中国化合物

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Enrichment characteristics and risk assessment of Hg in bird feathers from Caohai wetland in Guizhou Province,China

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Acta Geochimica 2018年第4期37卷 526-536页

作者： Fengcheng Peng tianrong he Zhenji Li Mengyu Chen Xiaoli Qian Lingxia Zeng Yiyuan Xu Key Laboratory of Karst Environment and Geohazard Prevention Guizhou University Area Management Bureau of Guizhou Caohai National Nature Reserve The School of Resources and Environment Engineering Guizhou University

Based on the analysis of the enrichment char- acteristics of Hg and MeHg in bird feathers from Caohai National Nature Reserve in Guizhou, the risks of Hg pol- lution to the birds from Caohai wetland have been evalu- ated. The total Hg content of bird feathers ranges from 40 to 5058 ng/*** an average of 924 ng/g. The content of MeHg is significantly correlated with total Hg （r = 0.68,p 〈 0.01）, and the content are among 0.75 and 113 ng/g. The total Hg content in the birds feathers is significantly dependent on their feeding habits, which is mainly in accordance with the following rule： carnivorous birds 〉 omnivorous birds that are mainly carnivo- rous 〉 omnivorous birds that are mainly herbivorous. There are also differences in the Hg enrichment ability in the different parts of bird feathers, and the total Hg and MeHg content in the wing feathers are significantly higher than that in the other parts of feathers. The bioaccumula- tion coefficients of aqueous Hg and MeHg by bird feathers are 0.9 × 10︿4-112.13× 10︿4 （mean value is 20.47 ×10︿4）and 0.47 × 10︿4-70.4 × 10︿4 （mean value is 9.52 × 10︿4）, respectively. Although the whole Hg level in Caohai bird feathers is not too high, the Hg content in some carnivorous birds exceeds over or approaches the abnormal threshold when birds are breeding （5μg/g）, which indicates that the birds in Caohai wetland are faced with some risks of ecological Hg pollution.

关键词： Caohai wetland Total Hg Methyl Hg Birdfeathers

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Elevated methylmercury production in mercury-contaminated soil and its bioaccumulation in rice:key roles of algal decomposition

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Frontiers of Environmental Science & Engineering 2023年第12期17卷 31-45页

作者： Di Liu Yan Wang tianrong he Deliang Yin Shouyang he Xian Zhou Yiyuan Xu Enxin Liu Key Laboratory of Karst Georesources and Environment(Ministry of Education) Guizhou UniversityGuiyang 550025China College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China Guizhou Karst Environmental Ecosystems Observation and Research Station Ministry of EducationGuiyang 550025China

Algal-derived organic matter(AOM)regulates methylmercury(MeHg)fate in aquatic ecosystems,whereas its role in MeHg production and bioaccumulation in Hg-contaminated paddies is *** and microcosm experiments were thus performed to understand the response characteristics of MeHg concentrations in soil and rice in different rice-growing periods to algal *** to the control,algal decomposition significantly increased soil water-soluble cysteine concentrations during the rice-tillering and grain-filling periods(Phe molecular weight of soil-dissolved organic matter(SDOM)during the rice-tillering period(Phe grain-filling *** to the control,AOM input increased the abundance of potential Hg and non-Hg methylators in ***,it also greatly increased soil MeHg concentrations by 25.6%-80.2%and 12.6%-66.1%during the rice-tillering and grain-filling periods,with an average of 42.25%and 38.42%,respectively,which were significantly related to the elevated cysteine in soil and the decrease in SDOM molecular weight(Phe early stage(within 10 days of microcosm experiments),the MeHg concentrations in decayed algal particles showed a great decrease(Phe MeHg concentrations and bioaccumulation factors in rice grains,by 72.30%and 16.77%,***,algal decomposition in Hg-contaminated paddies is a non-negligible factor promoting MeHg accumulation in soil-rice systems.

关键词： Mercury Methylmercury Algae Organic matter Rice(Oryza sativa L.)

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Spatial and temporal distributions of mercury species and controlling factors in Hongfeng Reservoir, Guizhou, China

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Chinese Journal Of Geochemistry 2006年第B08期25卷 147-148页

作者： tianrong he Xinbin FENG Guangle QIU Weiyang BAI Zhonggen LI Julia LU State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Science Guiyang 550002 China Department of Chemistry and Biology Ryerson University 350 Victoria St. Toronto ON Canada

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Regulate electric double layer for one-step synthesize and modulate the morphology of(oxy)hydroxides

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Nano Research 2024年第5期17卷 3675-3683页

作者： Jiaxin Liu Yue Shi Yanli Gu Zheng Lv Liang Zhao Yu Yang tianrong Zhan Jianping Lai Lei Wang State Key Laboratory Base of Eco-Chemical Engineering International Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

FeOOH have received considerable attention due to their natural abundance and *** the significant progress achieved,the one-step synthesis of integrated FeOOH is still a major ***,the current research on FeOOH catalyst still suffers from the unclear mechanism of controlling ***,density functional theory(DFT)calculations and X-ray photoelectron spectroscopy(XPS)demonstrated the strong electron-capturing and hydrogen absorption ability of Co in FeOOH,which further promotes the formation and stabilization of *** used a one-step electrodeposition method to synthesize Co introduced FeOOH integrated electrocatalyst and propose to introduce ions with different valence states to regulate the morphology of FeOOH by precise modulation of electric double layer(EDL)composition and *** prepared Co-FeOOH-K^(+)has a larger electrochemically active surface area(ECSA)(325 cm^(2))and turnover frequency(TOF)value(0.75 s^(-1)).In the electrochemical experiments of an alkaline anion exchange membrane electrolyzer,Co-FeOOH-K^(+)shows better oxygen evolution performance than commercial RuO_(2) under industrial production conditions and has good industrial application prospects.

关键词： integrated(oxy)hydroxides electrodeposition electric double layer(EDL) oxygen evolution reaction(OER) morphology regulation

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