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Nano Research 2025年第1期18卷 195-207页

作者： Chun Zhu Yifei Yang Yike Jing Zhen Zeng Xuesong Yi Wei Sun Fei Yang key laboratory of Agro-Forestry environmental Processes and ecological Regulation of Hainan Province School of Environmental Science and EngineeringHainan UniversityHaikou 570228China

Electrochemical nitrate reduction reaction(NO3RR)to ammonia is a promising approach to address excess Ncontamination in aqueous environment but suffers from a limited ammonia yield and selectivity due to the low concentration and sluggish *** work reports a three-dimensional porous electrode with binary Co_(2)Cu_(1)hydroxy phosphate embedded into the surface of Ni_(3)Co_(1)oxy/hydroxides(CoCu-PH@NiCo/Ni,“PH”means phosphate-hydroxide),which delivers a yield of 4.13 mg·h^(-1)·cm^(-2)with a high Faraday efficiency of 92.6%under a low nitrate concentration of 40 mM and provide an impressive *** embedded structure of the as-prepared catalyst exhibits unique metal coordination ligands and valence states different from the unitary *** electrochemical in situ infrared spectra and theoretical calculations revealed that the Co sites with the ability to dissociate water molecular to form adsorbed OH*can effectively provide the required protons for the deoxygenation and hydrogenation steps during NO3-conversion,thereby,effectively reducing the energy barrier of the key transition states in the NO3RR process to improve the intrinsic *** demonstrate that the rational design of binary components with the appropriate ability to activate water molecules as well as the threedimensional porous skeletal structure are expected to promote effectively the low-concentration nitrates conversion to ammonia.

关键词： nitrate reduction hydroxy phosphate surface embedded water dissociation active hydroxy adsorbed

Probabilistic ecological risk assessment of cadmium in the Bohai Sea using native saltwater species

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Acta Oceanologica Sinica 2014年第12期33卷 212-221页

作者： MU Jingli WANG Juying WANG Ying CONG Yi ZHANG Zhifeng key laboratory for ecological environment in coastal areas State Oceanic Administration National Marine environmental Monitoring Center

Predicted no-effect concentration （PNEC） is often used in ecological risk assessment to determine low-risk concentrations for chemicals. In the present study, the chronic data from native saltwater species were used to calculated PNEC values using four methods： log-normal distribution （ETX 2.0）, log-triangle distribution （US EPA＇s water quality criteria procedure）, burr III distribution （BurrliOZ） and traditional assessment fac-tor （AF）. The PNECs that were calculated using four methods ranged from 0.08 μg/L to 1.8 μg/L. Three of the SSD-derived PNECs range from 0.94 to 1.8 μg/L, about a factor of two apart. To demonstrate the use of SSD-based PNEC values and comprehensively estimate the regional ecological risk for cadmium in surface water of the Bohai Sea, in the Liaodong Bay, Bohai Bay, and Laizhou Bay, China, the dissolved cadmium con-centrations were measured and obtained 753 valid data covering 190 stations from July 2006 to November 2007. Based on three ecological risk assessment approaches, namely hazard quotient （HQ）, probabilistic risk quotient and joint probability curve （JPC）, the potential ecological risk of cadmium in surface water of the Liaodong Bay, Bohai Bay, and Laizahou Bay were estimated. Overall, the ecological risk of cadmium to aquatic ecosystem in the whole Bohai Sea was at acceptable ecological risk level, the order of ecological risk was Liaodong Bay〉Bohai Bay〉Laizhou Bay. However, more concerns should be paid to aquatic ecological risk in the Liaodong Bay which is the home of many steel, metallurgy and petrochemical industrial in China.

关键词： Bohai Sea cadmium PNEC SSD probabilistic ecological risk assessment

A novel method through solid phase extraction combined with gradient elution for concentration and separation of 66(ultra)trace persistent toxic pollutants in Antarctic waters

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Chinese Chemical Letters 2016年第3期27卷 405-411页

作者： Li Zhang Guang-Shui Na Chun-Xiang He Rui-Jing Li Hui Gao Lin-Ke Ge Yan-Jie Wang Yao Yao School of Chemistry and Chemical Engineering Liaoning Normal University key laboratory for ecological environment in coastal areas (SOA) National Marine Environmental Monitoring Center

This study developed a method to perform the simultaneous concentration and selective separation of 66 （ultra） trace persistent toxic substances in Antarctic waters. The substances included 30 polychlorinated biphenyls, 17 organochlorine pesticides, 16 polycyclic aromatic hydrocarbons, 3 hexabromocyclododecanes. Solid phase extraction was performed using a C18 membrane and silica gel column. Gradient elution was conducted using organic solvents with different polarities; as a result, the efficiency of the C18 film is improved and the interferences from impurities and target compounds are eliminated. Extracts were subsequently analyzed through gas chromatography or liquid and gas chromatography coupled to tandem mass spectrometry. Method validation yielded the following values： recoveries of all target analytes in the Antarctic water ranged from 87.3% to 117.6% and reproducibility as percent relative standard deviation was lower than 5%. Quantification limits ranged from 0.004 μg L^-1 to 0.030 μg L^-1. The established method improved the recoveries and reduced the limits of detection. Results indicated the method exhibited good performance in the simultaneous concentration and selective separation of 66 （ultra） trace organic pollutants; Therefore, the proposed sample pretreatment can potentially eliminate the effects of various classes of impurities to some extent.

关键词： Polychlorinated biphenyls(PCBs) Organochlorine pesticides(OCPs) Polycyclic aromatic hydrocarbons(PAHs) Hexabromocyclododecanes(HBCDs) Solid phase extraction(SPE) Gradient elution

Distribution and characteristic of PAHs in snow of Fildes Peninsula

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Journal of environmental Sciences 2011年第9期23卷 1445-1451页

作者： Guangshui Na Chunyang Liu Zhen Wang Linke Ge Xindong Ma Ziwei Yao key laboratory for ecological environment in coastal areas National Marine Environmental Monitoring Center Dalian 116023 China School of Bio- Technology Dalian Polytechnic University Dalian 116034 China

Polycyclic aromatic hydrocarbons （PAHs） investigation in different matrices has been reported largely,whereas reports on snow samples were ***,as the main matrix in the polar region,has an important study *** in snow samples were analyzed to investigate the distribution and contamination status of them in the Antarctic,as well as to provide some references for global migration of *** samples collected in Fildes Peninsula were enriched and separated by solid-phase membrane disks and eluted by methylene dichloride,then quantified by gas chromatography/mass *** types of PAHs were detected except for Benzo（a）*** component analysis method was applied to characterize *** factors （Naphthalene,Fluorene and Phenanthrene） accounted for 60.57%,21.61% and 9.80%,*** results showed that the major PAHs sources maybe the atmospheric transportation,and the combustion of fuel in Fildes *** comparison of concentration and types of PAHs between accumulated snow and fresh snow showed that the main compound concentrations in accumulated snow samples were higher than those in fresh *** risk assessment indicated that the amount of PAHs in the snow samples would not lead to ecological risk.

关键词： PAHs snow Antarctic principal component analysis risk assessment

Phosphorus speciation in sediments of Lake Hongfeng, China

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Chinese Journal of Oceanology and Limnology 2011年第1期29卷 53-62页

作者：蒋翠红胡继伟黄先飞李存雄邓家军张杰刘峰 Guizhou Provincial key laboratory for Information System of Mountainous areas and Protection of ecological environment Guizhou Normal University

This study was conducted to evaluate the distribution characteristics of phosphorus and its species in 14 sediments samples collected from Lake Hongfeng based on sequential extraction. Lake Hongfeng, a major drinking-water source for Guiyang City in southwestern China, is one of the largest artificial reservoirs located in a typical karstic area of the Yunnan-Guizhou Plateau. The results of this study indicate that the average percentages of DP, Al-P, Fe-P, Ca-P and OP in the lake sediments were 0.52, 6.59, 6.09, 42.85 and 40.27, respectively. The concentrations of organic phosphorus (OP) were lower than those of inorganic phosphorus (IP), which consisted mainly of calcium-bound phosphorus (Ca-P). The high concentrations of Ca-P may temporarily control the release of phosphorus from the sediments because it is a relatively stable, inert, and non-bioavailable phosphorus fraction. However, a large number of phosphate solubilizing bacteria can transform insoluble phosphate into bioavailable forms. Moreover, the concentrations of total phosphorus (TP) in the lake sediments were high; thus, the potential for the release of phosphorus from the sediments to the water column and phosphorus bioavailability were still significant. Further statistical analyses of the results revealed significant correlations between phosphorus species in sediments from the lake with two extractable principal component species (PCs) and five selectable cluster levels allowing interpretation of possible origins of phosphorus loading and the release of phosphorus. Furthermore, available remediation measures were briefly assessed for the lake with consideration of its distinctive environmental features.

关键词： Eutrophication karstic environment lake sediments phosphorus speciation sequential extraction procedure

Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis

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Science China Earth Sciences 2018年第3期61卷 285-291页

作者： Chen TU Yongming LUO Ying TENG Peter CHRISTIE key laboratory of coastal environmental Processes and ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of Sciences key laboratory of Soil environment and Pollution Remediation Institute of Soil ScienceChinese Academy of Sciences

Chlorinated persistent organic pollutants, including polychlorinated biphenyls （PCBs）, represent a particularly serious environmental problem and human health risk worldwide. Leguminous plants and their symbiotic bacteria （rhizobia） are important components of the biogeochemical cycling of nitrogen in both agricultural and natural ecosystems. However, there have been relatively few detailed studies of the remediation of PCB-contaminated soils by legume-rhizobia symbionts. Here we report for the first time evidence of the reductive dechlorination of 2,4,4＇-trichlorobiphenyl （PCB 28） by an alfalfa-rhizobium nitrogen fixing symbiont. Alfalfa （Medicago sativa L.） inoculated with wild-type Sinorhizobiurn meliloti had significantly larger biomass and PCB 28 accumulation than alfalfa inoculated with the nitrogenase negative mutant rhizobium SmY. Dechlorination products of PCB 28, 2,4＇-dichlorobiphenyl （PCB 8）, and the emission of chloride ion （C1-） were also found to decrease significantly in the ineffective nodules infected by the mutant strain SmY. We therefore hypothesize that N2-fixation by the legume-rhizobium symbiont is coupled with the reductive dechlorination of PCBs within the nodules. The combination of these two processes is of great importance to the biogeochemical cycling and bioremediation of organochlorine pollutants in terrestrial ecosystems.

关键词： Biogeochemical cycling Legume-rhizobia symbiosis Microbe-assisted phytoremediation Nitrogen fixation,Polychlorinated biphenyls Soil pollution and remediation Reductive dechlorination

Temporal characteristics of algae-denitrifying bacteria co-occurrence patterns and denitrifier assembly in epiphytic biofilms on submerged macrophytes in Caohai Lake,SW China

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Journal of Oceanology and Limnology 2023年第6期41卷 2276-2291页

作者： Pinhua XIA Guoqing LI Xianfei HUANG Lei SHI Xin DU Tao LIN Guizhou Province key laboratory for Information System of Mountainous areas and Protection of ecological environment Guizhou Normal UniversityGuiyang 550001China

Denitrifying bacteria in epiphytic biofilms play a crucial role in nitrogen cycle in aquatic ***,little is known about the connection between algae and denitrifying bacteria and their assembly processes in epiphytic *** biofilms were collected from submerged macrophytes(Patamogeton lucens and Najas marina L.)in the Caohai Lake,Guizhou,SW China,from July to November 2020 to:(1)investigate the impact of abiotic and biotic variables on denitrifying bacterial communities;(2)investigate the temporal variation of the algae-denitrifying bacteria co-occurrence networks;and(3)determine the contribution of deterministic and stochastic processes to the formation of denitrifying bacterial *** and biotic factors influenced the variation in the denitrifying bacterial community,as shown in the Mantel *** co-occurrence network analysis unveiled intricate interactions among algae to denitrifying *** bacterial community co-occurrence network complexity(larger average degrees representing stronger network complexity)increased continuously from July to September and decreased in October before increasing in *** co-occurrence network complexity of the algae and nirS-encoding denitrifying bacteria tended to increase from July to *** co-occurrence network complexity of the algal and denitrifying bacterial communities was modified by ammonia nitrogen(NH_(4)^(+)-N)and total phosphorus(TP),pH,and water temperature(WT),according to the ordinary least-squares(OLS)*** modified stochasticity ratio(MST)results reveal that deterministic selection dominated the assembly of denitrifying bacterial *** influence of environmental variables to denitrifying bacterial communities,as well as characteristics of algal-bacterial co-occurrence networks and the assembly process of denitrifying bacterial communities,were discovered in epiphytic biofilms in this *** findings could aid in the appropriate un

关键词： denitrifying bacteria epiphytic biofilms co-occurrence networks submerged macrophytes community assembly

Hexabromocyclododecane-induced Genotoxicity in Cultured Human Breast Cells through DNA Damage

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Biomedical and environmental Sciences 2017年第4期30卷 296-300页

作者： LI Rui Jing GAO Hui NA Guang Shui LU Zi Hao YAO Yao YANG Fan key laboratory for ecological environment in coastal areas National Marine Environmental Monitoring Center Dalian 116023LiaoningChina Shanghai Ocean University Shanghai 201306China

To investigate the genotoxicity and reveal the potential toxicological mechanisms of Hexabromocyclododecane （HBCD）, human breast cells HBL-100 were exposed to a sequence of HBCD concentrations （0, 5, 10, and 50 mg/L） for 24 h. With a series of zymology and molecular biology methods, we found that HBCD induced dose-dependent oxidative stress on HBL-100 DNA. As revealed in q RT-PCR, activated prognostic factor ATM down-regulated tumor suppressor gene BRCA1 and prompted DNA repair genes h OGG1 and h MTH1 expression in lower concentrations of HBCD （〈 10 mg/L）. However, DNA repair were inhibited as well as cell proliferation rate by higher concentrations of HBCD （50 mg/L）. The results inferred that the genotoxicity of HBCD was dose-dependent and related to DNA repair pathway.

关键词： DNA HBCD Hexabromocyclododecane-induced Genotoxicity in Cultured Human Breast Cells through DNA Damage

Occurrence and bioaccumulation of polybrominated diphenyl ethers in sediments and paddy ecosystems of Liaohe River Basin, northeast China

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Journal of environmental Sciences 2016年第5期28卷 250-256页

作者： Xindong Ma Haijun Zhang Wenjun Yao Wen Guo Depeng Li Ziwei Yao Jiping Chen State Oceanic Administration key laboratory for ecological environment in coastal areas National Marine Environmental Monitoring Center Dalian Institute of Chemical Physics Chinese Academy of Sciences School of Chemistry Engineering & Light Industry Dalian Polytechnic University

Concentrations of 16 polybrominated diphenyl ether（PBDE） congeners were measured in river sediments, paddy soils and three species of paddy-field organisms（crab, loach and carp） collected from the Liaohe River Basin, northeastern China. The total contents of PBDEs（∑_（16）PBDEs） in sediments and paddy soils were in the ranges of 273.4–3246.3 pg/g dry weight（dw）, and 192.1–1783.8 pg/g dw, respectively. BDE 209 was the dominant congener both in sediments and paddy soils. The concentrations of ∑_（16）PBDEs in sediments were significantly higher than those in the adjacent paddy soils, indicating a potential transport of PBDEs from river to paddy ecosystems via river water irrigation. The biota–soil accumulation factor（BSAF） was calculated as the ratio between the lipid-normalized concentration in paddyfield organisms and the total organic carbon-normalized concentration in paddy soil. The average BSAF values of ∑15PBDEs followed the sequence of crab（3.6）〉 loach（3.3）〉 carp（2.1）. BDE 154 had the highest BSAF value, and a parabolic trend between BSAF values of individual PBDE congeners and their log KOWvalues was observed. In view of the fact that crab had the larger BSAF value and higher lipid content, the ecological risk and health risk for crab cultivation in paddy fields should be of particular concern.

关键词： Polybrominated diphenyl ethers Bioaccumulation Sediment Paddy field Liaohe River Basin

coastal acidification in summer bottom oxygen-depleted waters in northwestern-northern Bohai Sea from June to August in 2011

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Chinese Science Bulletin 2012年第9期57卷 1062-1068页

作者： ZHAI WeiDong ZHAO HuaDe ZHENG Nan XU Yi key laboratory for ecological environment in coastal areas （State Oceanic Administration） National Marine Environmental Monitoring Center Dalian 116023 China State key laboratory of Marine environmental Science Xiamen University Xiamen 361005 China

Dissolved oxygen(DO) and pH in the central part of the Bohai Sea were surveyed in late June and late August,*** the June cruise,the bottom DO was in the range of 215-290 μmol-O2 kg-1(i.e.85%-115% of the saturation level),and the bottom pH was in the range of 7.82-8.04 on the total-hydrogen-ion *** August,however,both the bottom DO and the pH had significantly declined in the northwestern-northern near-shore areas,where the water depth was no more than 35 *** lowest bottom DO was 100-110 μmol-O2 kg-1(only 44%-47% of the June DO values) in the northern near-shore area,where the bottom pH was 7.64-7.68 on the total-hydrogen-ion scale(0.16-0.20 units lower than the June pH value).The largest decreases in DO and in pH were observed in the northwestern near-shore bottom waters,corresponding to declines of 170 μmol-O2 kg-1(as high as 59% of the June DO value) and 0.29 pH units,*** greatest pH decline of 0.29 pH units meant that the total-hydrogen-ion concentration doubled in the bottom waters from June to *** on field measurements of bottom DO/pH combined with a simplified model simulation,we suggest that respiration/remineralization-derived CO2 increased the acidity in the bottom oxygen-depleted waters of northwestern-northern near-shore areas in the Bohai Sea as a result of coastal red tides and/or marine *** aquatic chemistry is suggested to be partially responsible for scallop-breeding failures in the northwestern Bohai Sea in summer 2011.

关键词：渤海中部渤海海域西北部溶解氧底部沿海夏季气耗