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Two selenium tolerant Lysinibacillus sp. strains are capable of reducing selenite to elemental Se efficiently under aerobic conditions

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Journal of Environmental Sciences 2019年第3期31卷 238-249页

作者： Ju Zhang Yue Wang Zongyuan Shao Jing Li Shuting Zan Shoubiao Zhou Ruyi Yang College of Environmental Science and engineering Anhui Normal University anhui provincial engineering laboratory of water and soil pollution control and remediation Anhui Normal University Institute of Functional Food Anhui Normal University

Microbes play important roles in the transport and transformation of selenium(Se) in the environment, thereby influencing plant resistance to Se and Se accumulation in plant. The objectives are to characterize the bacteria with high Se tolerance and reduction capacity and explore the significance of microbial origins on their Se tolerance, reduction rate and efficiency. Two bacterial strains were isolated from a naturally occurred Se-rich soil at tea orchard in southern anhui Province, China. The reduction kinetics of selenite was investigated and the reducing product was characterized using scanning electron microscopy and transmission electron microscopy-energy dispersive spectroscopy. The bacteria were identified as Lysinibacillus xylanilyticus and Lysinibacillus macrolides,respectively, using morphological, physiological and molecular methods. The results showed that the minimal inhibitory concentrations(MICs) of selenite for L. xylanilyticus and L. macrolides were 120 and 220 mmol/L, respectively, while MICs of selenate for *** and L. macrolides were 800 and 700 mmol/L, respectively. Both strains aerobically reduced selenite with an initial concentration of 1.0 mmol/L to elemental Se nanoparticles(SeNPs) completely within 36 hr. Biogenic SeNPs were observed both inside and outside the cells suggesting either an intra-or extracellular reduction process. Our study implied that the microbes from Se-rich environments were more tolerant to Se and generally quicker and more efficient than those from Se-free habitats in the reduction of Se oxyanions. The bacterial strains with high Se reduction capacity and the biological synthesized Se NPs would have potential applications in agriculture, food, environment and medicine.

关键词： Selenium tolerant bacteria Selenite reduction Nanoparticles Reduction rate Reduction efficiency Sources

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Toxicity of lead pollution to the collembolan Folsomia candida in Ferri-Udic Cambosols

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Pedosphere 2021年第4期31卷 627-637页

作者： Ying DING Zhu LI Xin KE Longhua WU Shengpeng ZUO Key laboratory of soil Environment and pollution remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) College of Environmental Science and engineering Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and RemediationAnhui Normal UniversityWuhu 241003(China) Institute of Plant Physiology and Ecology Shanghai Institute for Biological SciencesChinese Academy of SciencesShanghai 200032(China)

Toxic effect of lead(Pb) pollution on Collembola in soils has seldom been studied in depth, which is especially true for growth responses since the juveniles are very small and numerous. A single species test was conducted using the collembolan Folsomia candida as the indicator species, and soil Pb pollution(at Pb concentrations of 0, 300, 600, 1 200, 2 400, and 4 800 mg kg^(-1)) was simulated by mixing Pb(NO_(3))_(2) with a natural unpolluted soil. Adult survival, reproduction, body length, and body Pb concentration were determined. Adult survival and reproduction started to decrease at soil Pb concentrations of 1 200 and 600 mg kg^(-1), respectively. Lead concentrations in adult and juvenile bodies increased with increasing Pb concentration in soil. The percentage and individual abundances based on body length analysis showed that the larger adults(2.1–2.6 mm, P soil Pb concentration than the intermediate(1.9–2.1 mm, P soil Pb concentration than the intermediate(0.6–1.0 mm, P soil Pb concentration, suggesting that larger individuals were more sensitive to soil Pb pollution. Therefore, body length features, especially the percentage and abundance of larger individuals, would be potential bio-indicators of soil Pb pollution and possibly other types of soil pollution.

关键词： bio-indicators body length Collembola large individuals soil Pb pollution

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Diphenylarsinic acid sorption batch experiments and mechanisms in soils using EXAFS spectroscopy

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Frontiers of Environmental Science & engineering 2020年第4期14卷 31-42页

作者： Meng Zhu Yongming Luo Ruyi Yang Shoubiao Zhou Juqin Zhang Mengvun Zhang Peter Christie Elizabeth L.Rylott College of Environmental Science and engineering.anhui Normal University Wuhu 241002China Key laboratory of soil Environment and pollution remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Key laboratory of Coastal Environmental Processes and Ecological remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China anhui provincial engineering laboratory of water and soil pollution control and remediation Anhui Normal UniversityWuhu 241002China Centre for Novel Agricultural Products Department of BiologyUniversity of YorkYork YO105DDUK

Diphenylarsinic acid(DPAA)is a phenyl arsenic compound derived from chemical warfare *** and microscopic work on DPAA sorption will provide useful information in predicting the partitioning and mobility of DPAA in the soil-water ***,batch experiments and extended X-ray absorption fine structure(EXAFS)spectroscopy were used to investigate the sorption mechanisms of *** DPAA sorption data from 11 soil types was found to fit the Freundlich equation,and the sorption capacity,Kf,was significantly and positively correlated with oxalateextractable *** Kf values of eight of the 11 untreated soils(1.51113.04)significantly decreased upon removal of amorphous metal(hydr)oxides(0.51-13.37).When both amorphous and crystalline metal(hydr)oxides were removed from the untreated soils,the values either decreased or slightly increased(0.65-3.09).Subsequent removal of soil organic matter from these amorphous and crystalline metal(hydr)oxide-depleted samples led to ftirther decreases in A^f to 0.021.38,with only one exception(Sulfic Aquic-Orthic Halosols).These findings strongly suggest that ligand exchange reactions with amorphous metal(hydr)oxides contribute most to DPAA sorption on *** data provide further evidence that DPAA primarily formed bidentate binuclear(~C)and monodentate mononuclear(1 V)coring-sharing complexes with As-Fe distances of 3.34 and 3.66 A,respectively,on Fe(hydr)*** of these results with earlier studies suggests that 2C and 1 F complexes of DPAA may be favored under low and high surface coverages,respectively,with the formation of 1 V bonds possibly conserving the sorption sites or decreasing the steric hindrance derived from phenyl substituents.

关键词： Diphenylarsinic acid EXAFS Fe(hydr)oxide soil organic matter Sorption mechanism

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Sorption mechanisms of diphenylarsinic acid on natural magnetite and siderite:Evidence from sorption kinetics,sequential extraction and extended X-ray absorption fine-structure spectroscopy analysis

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Frontiers of Environmental Science & engineering 2022年第9期16卷 39-52页

作者： Meng Zhu Yuhuan He Xiaobao Wei Haoran Qi Yunpeng Zhang Yijun Zhang Ruyi Yang Yongming Luo School of Ecology and Environment Anhui Normal UniversityWuhu 241002China Key laboratory of soil Environment and pollution remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Key laboratory of Coastal Environmental Processes and Ecological remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China anhui provincial engineering laboratory of water and soil pollution control and remediation Anhui Normal UniversityWuhu 241002China Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt Anhui Normal UniversityWuhu 241002China

Diphenylarsinic acid(DPAA)is both the prime starting material and major metabolite of chemical weapons(CWs).Because of its toxicity and the widespread distribution of abandoned CWs in burial site,DPAA sorption by natural Fe minerals is of considerable *** we report the first study on DPAA sorption by natural magnetite and siderite using macroscopic sorption kinetics,sequential extraction procedure(SEP)and microscopic extended X-ray absorption fine-structure spectroscopy(EXAFS).Our results show that the sorption pseudo-equilibrated in 60 minutes and that close to 50%and 20%–30%removal can be achieved for magnetite and siderite,respectively,at the initial DPAA concentrations of 4–100 mg/*** sorption followed pseudo-secondary and intra-particle diffusion kinetics models,and the whole process was mainly governed by intra-particle diffusion and chemical *** and EXAFS results revealed that DPAA mainly formed inner-sphere complexes on magnetite(>80%),while on siderite it simultaneously resulted in outer-sphere and inner-sphere *** analysis further confirmed the formation of inner-sphere bidentate binuclear corner-sharing complexes(^(2)C)for *** of these results with previous studies suggests that phenyl groups are likely to impact the sorption capacity and structure of DPAA by increasing steric hindrance or affecting the way the central arsenic(As)atom maintains charge *** results improve our knowledge of DPAA interactions with Fe minerals,which will help to develop remediation technology and predict the fate of DPAA in soil-water environments.

关键词： Diphenylarsinic acid(DPAA) Sorption Magnetite Siderite Sequential extraction EXAFS

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Mechanistic insights into the synergetic remediation and amendment effects of zeolite/biochar composite on heavy metal-polluted red soil

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Frontiers of Environmental Science & engineering 2024年第9期18卷 105-114页

作者： Jing Li Dazhong Yang Wensong Zou Xuezhen Feng Ranhao Wang Renji Zheng Siyuan Luo Zheting Chu Hong Chen State Environmental Protection Key laboratory of Integrated Surface water-Groundwater pollution control Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution ControlSchool of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Red soil,the most critical soil resource in tropical/subtropical regions worldwide,faces tremendous threats,including nutrient deficiency,acidification,and heavy metal *** is a great demand for multifunctional eco-materials capable of modifying this ***,we used widely distributed soil and biomass to develop a zeolite/biochar composite for synergistic red soil remediation and *** the composite material,the Pb^(2+) and Cd^(2+) remediation efficiencies reached 92.8%and 92.9%,respectively,in stems under optimal ***,the acidity and nutrient deficiency conditions of red soil significantly *** atomic-scale interaction mechanism during the remediation and amendment process was elucidated with complementary characterization methods,which revealed that in the zeolite/biochar composite material,zeolite contributes to longterm heavy metal remediation ***,biochar is responsible for soil quality amendment and short-term heavy metal ***,for the first time,single-atom heavy metal ions were observed on biochar during the remediation process,indicating the broad distribution of single atoms in the natural environment.

关键词： Red soil Heavy metal pollution Zeolite/biochar composite soil remediation soil amendment

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Experimental determination of sediment transport capacity of rill flow over sandified loess slope

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International soil and water Conservation Research 2023年第2期11卷 301-310页

作者： Ren Feng Jiacun Chen Zhenyue Xie Dingqiang Li Zaijian Yuan National-Regional Joint engineering Research Center for soil pollution control and remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou510650China Meizhou International Institute of soil and water Conservation Meizhou514000China

Rill erosion is affected by the sand particle content in soil,especially in the wind and water erosion transition region of the Loess *** sediment transport capacity(STC)is a key parameter in rill erosion research,assessing the impact of aeolian sand intrusion on the STC of rill flow is of importance for a better understanding of rill *** study aimed to assess the effect of aeolian sand intrusion on the STC on sandified loess slopes,with typical slopes and flow discharges,using a flume system which consisting of a sediment-feeding and a sediment-supply/settlement *** sediment feeding flume was jointed by 10°higher than that of the sediment measurement flume *** flow discharges(2,4,and 8 L min^(-1))and four slope gradients(5°,10°,15°,and 25°)were used to represent the natural hydrological conditions under three intrusion rates(SIR)of aeolian sands(10%,20%,and 50%).The results show that STC increased with slope gradient and flow discharge,and the relationship between the STC and the SIR was significantly affected by the slope gradient;the STCs decreased with the SIR on a slope of 5°but increased with the SIR on steep slopes of 15°-25°,implying a significant impact of slope gradient on the relationship between SIR and *** SIR of 50%resulted in the highest sediment concentration nearly 1200 kg m^(-3)on slopes of 25°.On sandified loess slopes of 10%,20%,and 50%SIR,the STC were about 30%,46%,and 57%higher than on loess slopes,indicating an increased erosion rate by sand particle intrusion into loess *** results highlight the impact of sand intrusion on STC of rill flow and provide deeper insights into the soil loss process on the sandified loess slope.

关键词： Sand intrusion Loess soil Rill flow Transport capacity

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Effects of typical microplastics on metabolites chemistry in dominant benthic animals

Effects of typical microplastics on metabolites chemistry in...

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中国第九届植物化感作用学术研讨会

作者： HONG Wenxiu ZUO Shengpeng WANG Hao QIN Xiaohui anhui provincial engineering laboratory of water and soil pollution control and remediation College of Environmental Science and EngineeringAnhui Normal University

Microplastics(MPs) refer to plastic fragments or granules with a particle size of less than 5 *** a novel type of pollutants in the environment,microplastics has caused many attentions in eco-toxicology and *** this paper,three types of representative microplastics low-density polyethylene(LDPE),polycaprolactam(PA6),and polyvinyl chloride(PVC) were assessed for their toxicity on growth and metabolic chemistry of Limnodrilus hoffmeisteri and Chironomid spp..In the exposure of 24 h,48 h and 28 d,PA6 displayer stronger toxic effects than LDPE and *** microplastic concentration showed a significant dose-and time-dependant relationship with the mortality,body length and biomass of the *** *** more sensitive to the microplastics compared with ***6 and PVC can induce the oxidative stress response and damage the antioxidant system of aquatic benthic organisms,and but it did not occur for ***,LDPE and PVC displayed significant effects on chemicals categories and contents in *** microplastics reduced the release of fatty acids in *** *** introduction of exterior pollutants will alter chemical interaction between organism in the aquatic *** it is so necessary and crucial to reasonably evaluate the eco-environment effects of these novel pollutants in our living circumstances.

关键词： Microplastics Chironomid spp. Limnodrilus hoffmeisteri toxic effects metabolites chemistry

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Attenuation of Metal Bioavailability in Acidic Multi-Metal Contaminated soil Treated with Fly Ash and Steel Slag

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Pedosphere 2012年第4期22卷 544-553页

作者： QIU Hao GU Hai-Hong HE Er-Kai WANG Shi-Zhong QIU Rong-Liang School of Environmental Science and engineering Sun Yat-sen UniversityGuangzhou 510275(China) Guangdong provincial Key Lab of Environmental pollution control and remediation Technology Guangzhou 510275(China)

A pot experiment was conducted with multi-metal （Pb, Cd, Cu, and Zn） contaminated acidic soil to investigate changes in available metal burden resulting from the application of industrial wastes （fly ash and steel slag）. The efficiency of amendments- induced metal stabilization was evaluated by diffusive gradients in thin films （DGT）, sequential extraction, and plant uptake. The stability of remediation was assessed by an acidification test and by chemical equilibrium modeling. Addition of fly ash （20 g kg-1） and steel slag （3 g kg-1） resulted in similar increase in soil pH. Both amendments significantly decreased the concentrations of metals measured with DGT （CDGT） and the metal uptake by Oryza sativa L. Significant correlations were found between CDGT and the concentration of a combination of metal fractions （exchangeable, bound to carbonates, and bound to Fe/Mn oxides）, unraveling the labile species that participate in the flux of metal resupply. The capability of metal resupply, as reflected by the R （ratio of CDGT to pore water metal concentration） values, significantly decreased in the amended soils. The CDGT correlated well with the plant uptake, suggesting that DGT is a good indicator for bioavailability. Acidification raised the extractable metal concentration in amended soil but the concentration did not return to the pre-amendment level. Equilibrium modeling indicated that the soil amendments induced the precipitation of several Fe, A1 and Ca minerals, which may play a positive role in metal stabilization. Chemical stabilization with alkaline amendments could be an effective and stable soil remediation strategy for attenuating metal bioavailability and reducing plant metal uptake.

关键词： acidification chemical stabilization diffusive gradients in thin films (DGT) heavy metal remediation

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Characterization of Strain Pseudomonas sp. Q1 in Microbial Fuel Cell for Treatment of Quinoline-Contaminated water

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Pedosphere 2012年第4期22卷 528-535页

作者： ZHANG Cui-Ping CHEN Shah-Shan LIU Guang-Li ZHANG Ren-Duo XIE Jian South China Sea Marine engineering and Environment Institute SOAGuangzhou 510300(China) School of Environmental Science and engineering Sun Yat-sen UniversityGuangzhou 510275(China) Guangdong provincial Key laboratory of Environmental pollution control and remediation Technology Guangzhou 510275(China)

To find new strain in the microbial fuel cell (MFC) for quinoline removal from wastewater and soil, a facultative anaerobic bacterium strain was isolated from the anode of MFC, utilizing quinoline as the carbon source and electron donor. Based on the 16S rRNA sequence analysis, the bacterium strain was Gram-negative and identified as Pseudomonas sp. Q1 according to its morphology and physiochemical properties. The strain was inoculated into a double-chambered MFC using various quinoline concentrations (0, 50, 75, 86, 100, 150, 200 and 300 mg L-1 ) combining with 300 mg L-1 glucose as the fuel. Results showed that electricity was generated from the MFC, in which quinoline was degraded simultaneously. The values of Coulombic efficiency (CE) increased with the increase of quinoline concentrations from 0 to 100 mg L-1 then decreased with the increase of quinoline concentration from 100 to 300 mg L-1 , and the maximum CE 36.7% was obtained at the quinoline concentration of 100 mg L-1 . The cyclic voltammetry analysis suggested that the mechanism of electron transfer was through excreting mediators produced by the strain Q1. The MFC should be a potential method for the treatment of quinoline-contaminated water and soil.

关键词： bacterium strain biodegradation electron transfer power generation glucose

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Crucial role of iron plaque on thallium uptake by rice plant

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Waste Disposal and Sustainable Energy 2023年第1期5卷 89-96页

作者： Xiaoyin Zhang Wenhuan Yuan Juan Liu Haoran Li Han Cai Haiyao Hu Dongyi Ren Yuhua Zhang Yuxiang Shen Jin Wang School of Environmental Science and engineering and Key laboratory of waters Quality&Conservation in the Pearl River Delta Ministry of EducationGuangzhou UniversityGuangzhou510006China Guangdong provincial Key laboratory of Radionuclides pollution control and Resources Guangzhou510006China

Iron plaque is a Fe-containing oxide film produced by the oxidation of Fe(II)in the rice root system under the combined action of oxygen infiltration and other *** to its special surface structure and physio-chemical properties,the iron plaque has a strong absorption capacity for a variety of heavy metal *** study aimed to first investigate the effects of Fe species on the geochemical fractionation of Tl in typical paddy soil systems affected by industrial activities,followed by pot culture experiments to probe the effects of Fe species on the uptake and translocation of Tl in rice *** results of field work preliminarily showed that iron at different valences affected the conversion of the Tl geochemical fraction in the *** Tl exerted significant positive correlation relationships with Fe2+and negative correlation relationships with Fe3+,while reducible Tl only displayed a positive correlation with Fe3+.Further analysis by pot culture experiments revealed that the contents of Fe were significantly positively correlated with Tl contents in Fe plaque(R2=0.529).In contrast,the water-soluble Tl contents in the soil were significantly negatively correlated with the contents of Fe(R2=–0.90,psoil–rice plant system,which provides new scientific support for the remediation of typical Tl-contaminated rice fields.

关键词： Iron oxide Thallium pollution Iron plaque Rice

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