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Selenite and selenate amendment into soils affect methylmercury accumulation in rice (Oryza sativa L.)

Selenite and selenate amendment into soils affect methylmerc...

The 17th International Conference on Heavy Metals in the Environment (ICHMET2014)(第十七届国际环境重金属会议)

作者： Yong-Jie Wang Huan Zhong School of Environment State Key Laboratory of Pollution Control and Resource ReuseNanjing UniversityNanjingJiangsu ProvincePeople''s Republic of China

Recent study reported that mercury levels in field-collected brown rice tended to decrease with increased soil selenium(Se)*** study temped to validate the possibility of Se application in the mercury contaminated paddy soils to reduce methylmercury(MeHg)accumulation in rice *** contaminated paddy soil was added with selenite(SeIV)or selenate(SeVI)and cultured for rice in *** levels in rice root,stem,flag leaf and harvested rice grain(brown rice and polished white rice)were *** levels in brown rice decreased by 34-38%in SeIV amended *** addition,MeHg levels in white rice correlated negatively with white Se concentrations in rice,root or soil,indicating antagonism of Se on MeHg accumulation in *** results suggested that such effect could be associated with selenium-mercury antagonistic interaction in soil(indicated by the significant decrease of soil MeHg levels under SeIV amendment),root(indicated by the reduced MeHg accumulation in root from soil)as well as within plant(indicated by the decrease in rice MeHg levels).The present study has taken an important first step to reduce mercury accumulation in rice and its consequent risk to the public health in mercury contaminated area by direct fertilization of Se.

关键词： Mercury Selenite Selenate Paddy soil Food safety

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Influences of rice residual burial on speciation and bioavailability of mercury in a rice paddy soil

Influences of rice residual burial on speciation and bioavai...

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The 17th International Conference on Heavy Metals in the Environment (ICHMET2014)(第十七届国际环境重金属会议)

作者： Hui-Ke Zhu Huan Zhong Nanjing University School of EnvironmentState Key Laboratory of Pollution Control and Resource ReuseNanjingJiangsu ProvincePeople''s Republic of China

Rice straw return is being encouraged in China as an economical and environmentally friendly method to get rid of rice residuals,while the effects of rice residual burial on the biogeochemical behaviors of mercury in contaminated soils are relatively *** the present study,rice residuals,including rice root and straw,were added into a mercury contaminated paddy soil to investigate the effects of rice residual burial on speciation and potential bioavailability of soil-bound *** bioavailability of mercury to plants or soil fauna was assessed by CaCl2 or BSA(bovine serum albumin)extraction *** results indicated that potential bioavailability of MeHg in soils was less affected by rice residual ***,concentrations of MeHg in soils increased significantly(2-8 times)after rice residual addition,possibly due to the elevated microbial activities or complexation of HgS by DOM originated from rice residual *** enhanced MeHg levels in soils could subsequently increase the exposure of plants or soil fauna to *** contrast,potential bioavailability of inorganic mercury(IHg)decreased significantly in rice residual added soils,which could be attributed to the immobilization of IHg by particulate organic matter in rice *** thus rice residual burial may decrease the risk of IHg in *** study reported for the first time that rice residual return may play a key role on speciation and bioavailability of mercury in contaminated soils,and should be considered in risk assessment of mercury.

关键词： Rice straw Methylmercury Paddy soil Speciation Bioavailability

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Prediction of methylmercury bioaccumulation in rice grains using (NH4)2S2O3 extraction method

Prediction of methylmercury bioaccumulation in rice grains u...

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The 17th International Conference on Heavy Metals in the Environment (ICHMET2014)(第十七届国际环境重金属会议)

作者： Dai-Wen Zhu Huan Zhong Nanjing University School of EnvironmentState Key Laboratory of Pollution Control and Resource ReuseNanjingJiangsu ProvincePeople''s Republic of China

Chemical extraction methods are being widely used to assess bioavailability of mercury in contaminated soils and predict mercury bioaccumulation in ***,validation of these methods,e.g.,correlating mercury extraction from different soils and its bioaccumulation in corps,has rarely been reported,which hindered application of these methods in risk assessment of mercury in contaminated *** the present study,three common chemical extraction methods(CaCl2,DTPA and(NH4)2S2O3 extractions)were applied to assess phytoavailability of methylmercury(MeHg)in soils of different properties,which were collected from different parts of *** MeHg extractions were correlated with determined MeHg concentrations in rice *** results indicated that single soil parameter(e.g.,soil composition,pH)could not provide a good estimate of MeHg bioavailability to rice plants and could not be used to predict MeHg concentrations in rice for different soil *** may be because that absorption and bioaccumulation of MeHg in rice were controlled by multiple factors *** the three extraction methods,MeHg extraction by(NH4)2S2O3 could best predict bioaccumulation of MeHg in rice grains for different soils(r2=0.661,p<0.01),suggesting that migration of MeHg from binding sites within soils(e.g.,reduced organic sulfur groups)to those on root surface could be the limiting step of MeHg bioaccumulation in ***,MeHg extraction by(NH4)2S2O3,which is simple and fast,could possibly be used to assess bioavailability of MeHg in different soil types and predict MeHg bioaccumulation in rice *** to our knowledge,this is the first study validating MeHg extraction by different chemical extractants with MeHg bioaccumulation in rice grains.

关键词： Chemical extraction Methylmercury Bioaccumulation Bioavailability Rice

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Nitrogen Removal Efficiency and Microbial Community Characterization of Anaerobic Ammonium Oxidation(ANAMMOX) Biofilter

Nitrogen Removal Efficiency and Microbial Community Characte...

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The 1st International Workshop on Urbanization in Watersheds:Ecological and Environmental Responses

作者： Tao-Tao ZENG Dong LI Hui-Ping ZENG Shui-Bo XIE Wen-Xin QIU Jie ZHANG Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology University of South China Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Under anoxic conditions, anaerobic ammonium oxidizing(ANAMMOX) bacteria convert ammonium and nitrite directly to dinitrogen gas(N2). ANAMMOX process could save aeration energy consumption, as well as less biomass production and without organic matter consumption, which was considered to be a promising new and more sustainable technique for nitrogen removal. In this study, an up-flow anaerobic ammonium oxidation(ANAMMOX) biofilter was operated to investigate ANAMMOX efficiency for low strength ammonia(46.5 mg/L) treatment at ambient temperature(20.3-23.2°C). Microbial compositions and functional populations of biofilter upper(140-190 cm), middle(40-140 cm) and lower(0-40 cm) parts were monitored by scanning electron microscopy(SEM), denaturing gradient gel electrophoresis(DGGE), clone and sequence. The results show that a stable performance of biofilter was obtained with an average nitrogen removal rate(NRR) of 2.26kg/(m3?d) and TN removal efficiency of 75.9%. 67 percents of ammonia and nitrite proportional disappeared in the middle part of biofilter. The spherical bacteria, which were similar to ANAMMOX bacteria, predominates in the middle part of biofilter. The number of bacterial DGGE bands was 8, and clone and sequence results showed that they represented Oxalicibacterium sp., Ignavibacterium album, Bacterium rJ15, Candidatus Kuenenia stuttgartiensis, Hippea maritima, Thioprofundum lithotrophica, and Rhodopseudomonas palustris. The types of ANAMMOX bacterium were constant in different parts of biofilter, which were identified as Candidatus Kuenenia stuttgartiensis. AF bioreactor maintained high activity due to ANAMMOX bacteria adaptation to ambient temperature and low matrix influent conditions.

关键词： Anaerobic Ammonium Oxidation(ANAMMOX) Biofilter Microbial Community Nitrogen Removal

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Mercury levels and potential dietary risk from crayfish (Procambarus clarkii) in China

Mercury levels and potential dietary risk from crayfish (Pro...

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The 17th International Conference on Heavy Metals in the Environment (ICHMET2014)(第十七届国际环境重金属会议)

作者： Qian Peng Ben Greenfield Fei Dang Huan Zhong Nanjing University School of EnvironmentState Key Laboratory of Pollution Control and Resource ReuseNanjingJiangsu ProvincePeople''s Republic of China Environmental Health Sciences Division School of Public HealthUniversity of CaliforniaBerkeleyCAUSA State Key Laboratory of Soil Environment and Pollution RemediationInstitute of Soil ScienceChinese Academy of SciencesNanjingJiangsu ProvincePeople''s Republic of China

Red swamp crayfish(Procambarus clarkii)is a common freshwater shellfish product in China,especially in *** China is considered to be one of the largest sources of global Hg emissions,and crayfish have been reported to accumulate Hg,there are few comprehensive studies regarding human Hg exposure due to crayfish consumption in *** study evaluated potential exposure risk for Chinese consumers of *** mercury(T-Hg)and methylmercury(MeHg)concentrations were determined in tail muscle of prepared and cooked *** collected from 25 restaurants throughout *** concentrations(wet weight basis)in 217 individual *** samples were 51.8±29.2ng/g T-Hg and 51.6±28.7 ng/g MeHg,*** concentrations varied between restaurants,mean values were relatively low with all samples below the national limit(500 ng/g).The estimated MeHg exposure risk for the general population in China from consuming crayfish was low,based on calculated hazard quotient(HQ < 0.01)and estimated daily intake(EDI = 0.96 ng/kg/d)of MeHg via crayfish *** results suggest that *** crayfish consumption results in limited contribution to MeHg exposure for Chinese ***,local exposure for subsistence consumers may warrant further consideration.

关键词： Methylmercury Crayfish Acceptable daily intake Dietary exposure China

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Biological uptake of 65Cu-DOC complexes by the green mussel Perna viridis

Biological uptake of 65Cu-DOC complexes by the green mussel ...

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The 17th International Conference on Heavy Metals in the Environment (ICHMET2014)(第十七届国际环境重金属会议)

作者： Huan Zhong Douglas Evans Wen-Xiong Wang Hui-Ke Zhu Nanjing University School of EnvironmentState Key Laboratory of Pollution Control and Resource ReuseNanjingJiangsu ProvincePeople''s Republic of China Environmental and Resource Studies Program(ERS)Trent UniversityPeterboroughOntarioCanada Division of Life ScienceThe Hong Kong University of Science and Technology(HKUST)Clearwater BayKowloonHong Kong

Stable Cu isotope(65Cu)was complexed with various representative dissolved organic carbon(DOC)sources,including coastal seawater DOC,fulvic acid(FA),cyanobacteria spirulina(SP)DOC,histidine(His),cysteine(Cys),and lipophilic diethyldithiocarbamate(DDC)at different *** uptake of these dissolved Cu species by the coastal green mussel Perna viridis was quantified for the first *** the Cu-DOC complexes were taken up in some measure by the mussels,which is in contrast to general expectations,but complexation generally reduced the Cu uptake as compared to that of the inorganic Cu *** DOC-type specific Cu uptake was dependent on some key properties of DOC,e.g.,size,concentrations and strong Cu binding *** of Cu was higher when complexed with small molecules(e.g.,free amino acids)while lower when complexed with large molecules(e.g.,spirulina proteins).Furthermore,DOC type-specific negative relationships were found between DOC levels and Cu *** Cu binding sites(including His and organic sulfur functional groups)within DOC appeared to control the inhibitory effects of DOC on Cu uptake,possibly due to the competitive binding of Cu between the dissolved phase and biological membranes or intracellular Cu binding *** addition,strong Cu binding sites may explain the differences in bioavailability of Cu complexed with different types of *** results highlight the importance of considering the specificity of Cu-DOC complexes when assessing biological exposure to dissolved Cu in natural waters,especially during events,such as phytoplankton bloom periods,that could modify DOC composition and concentrations.

关键词： Stable isotope Copper Dissolved organic matter Bioavailability Mussel

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Nitrogen Removal Efficiency and Microbial Community Characterization of Anaerobic Ammonium Oxidation (ANAMMOX) Biofilter

Nitrogen Removal Efficiency and Microbial Community Characte...

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The 1st International Workshop on Urbanization in Watersheds: Ecological and Environmental Responses(第一届流域城镇化生态与环境响应国际研讨会)

作者： Tao-Tao ZENG Dong LI Hui-Ping ZENG Shui-Bo XIE Wen-Xin QIU Jie ZHANG State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology University of South ChinaHengyang 421001China Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering Design & Research Institute Co.Ltd. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery EngineeringBeijing University of TechnologyBeijing 100124China

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Abiotic association of phthalic acid esters with humic acid of a sludge landfill

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 778-783页

作者： Xiaoli CHAI Yongxia HAO Xin ZHAO Guixiang LIU Ying ZHU Rong JI Jun WU Huanhuan TONG Youcai ZHAO State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China The Academy of Science of Shandong Province Jinan 250013China State Key Laboratory of Pollution Control and Resource Reuse Nanjing UniversityNanjing 210093China

The abiotic association between phthalic acid esters （PAEs） and humic substances （HS） in sludge landfill plays an important role in the fate and stability of PAEs. An equilibrium dialysis combined with 14C-labeling was used to study the abiotic association of two abundant PAEs （diethyl phthalate and di-n-butyl phthalate） with humic acid （HA） isolated from a sludge landfill with different stabilization times and different molecular weights. Ele- mental analysis and Fourier Transform Infrared Spectro- photometer （FTIR） suggested that high KA value of HA was related to the high aromatic content and large molecular weight of HA. The results indicated that the association strength of PAEs with HA depended on both the properties of the PAEs and the characteristics of HA. The KA values of the association were strongly dependent on solution pH, and decreased dramatically as the pH was increased from 3.0 to 9.0. The results suggested that non- specific hydrophobic interaction between PAEs and HA was the main contributor to the association of the PAEs with HA. The interactive hydrogen-bonds between the HA and the PAEs molecules may also be involved in the association.

关键词： abiotic association phthalic acid esters（PAEs） humic acid sludge landfill

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Cd2+ toxicity to a green alga Chlamydomonas reinhardtii as influenced by its adsorption on TiO2 engineered nanoparticles

Cd2+ toxicity to a green alga Chlamydomonas reinhardtii as i...

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The 4th UCAS Postgraduate Symposium(第四届UCAS高校研究生水环境科学研讨会)

作者： Weiwan YANG Aijun MIAO Liuyan YANG State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjingJiangsu Province 210093China

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Accumulation kinetics of arsenate in Daphnia magna under different phosphorus and food density regimes

Accumulation kinetics of arsenate in Daphnia magna under dif...

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The 4th UCAS Postgraduate Symposium(第四届UCAS高校研究生水环境科学研讨会)

作者： Aijun MIAO Ningxin WANG Liuyan YANG Wenxiong WANG State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093Jiangsu ProvinceChina

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