检索结果-南通市图书馆

Evaluation of water management on arsenic methylation and volatilization in arsenic-contaminated soils strengthened by bioaugmentation and biostimulation

引用

Journal of Environmental Sciences 2024年第3期137卷 515-526页

作者： Peng Chen Yi Liu guo-xin sun State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China University of Chinese Academy of Sciences Beijing 100049China

Arsenic(As) fate in paddy fields has been one of the most significant current issues due to the strong As accumulation potential of rice plants under fooded conditions. However,no attempt was done to explore As methylation and volatilization under non-fooded conditions. Herein, we investigated the effects of water management on As methylation and volatilization in three arsenic-contaminated soils enhanced by biostimulation with strawderived organic matter and bioaugmentation with genetic engineered Pseudomonas putida KT2440(GE P. putida). Under fooded conditions, the application of biochar(BC), rice straw(RS)and their combination(BC+RS) increased total As in porewater. However, these effects were greatly attenuated under non-fooded conditions. Compared with RS amendment alone, the combination of GE P. putida and RS further promoted the As methylation and volatilization,and the promotion percentage under non-fooded conditions were significantly higher than that under fooded conditions. The combined GE P. putida and RS showed the highest efficiency in As methylation(88 μg/L) and volatilization(415.4 μg/(kg·year)) in the non-fooded soil with moderate As contamination. Finally, stepwise multiple linear regression analysis presented that methylated As, DOC and p H in porewater were the most important factors contributing to As volatilization. Overall, our findings suggest that combination of bioaugmentation with GE P. putida and biostimulation with RS/BC+RS is a potential strategy for bioremediation of arsenic-contaminated soils by enhancing As methylation and volatilization under non-fooded conditions.

关键词： Arsenic methylation Arsenic volatilization Water management Straw incorporation Bioaugmentation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extraction study of rare earth elements with N,N'-dibutyl–N,N'-di(1-methylheptyl)-diglycolamide from hydrochloric acid

引用

Nuclear Science and Techniques 2016年第3期27卷 186-193页

作者： guo-Jing sun Jin-Hong Yang Hong-Xiao Yang guo-xin sun Yu Cui School of Chemistry and Chemical Engineering University of Jinan

A novel,unsymmetrical diglycolamide,N,N'-dibutyl-N,N'-di(1-methylheptyl)-diglycolamide(DBD1MHDGA),was *** extraction of rare earth elements(REEs) from a hydrochloric acid medium with DBD1 MHDGA was *** results of the extraction experiments indicated that the distribution ratios of RE(Ⅲ) ions increase with an increase in HC1 concentration,atomic number,and extractant *** calculated thermodynamic data show that the extraction process is an exothermic *** organic phase loaded rare earth ions were characterized by infrared *** composition of the extracted complex was determined.

关键词：稀土元素盐酸介质萃取剂庚基红外光谱表征盐酸浓度稀土离子分配比例

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Solvent extraction of U(Ⅵ) by N,N-dimethyl-N',N'-dioctylsuccinylamide and N,N-dimethyl-N',N'-didecylsuccinylamide in cyclohexane

引用

Nuclear Science and Techniques 2016年第3期27卷 68-73页

作者： Yu Cui Xiao-Feng Yang Cheng Yang Ye-xin Li guo-Zhu Chen guo-xin sun School of Chemistry and Chemical Engineering University of Jinan

The extraction of uranyl nitrate by novel extractants of N,N-dimethyl-N',N'-dioctylsuccinylamide(DMDOSA)and N,N-dimethyl-N',N'-didecylsuccinylamide(DMDDSA) from aqueous nitric/nitrate solutions was *** was found both the concentration of HNO_3 and extractants had an effect on the U(Ⅵ) extraction *** extraction mechanism was established,and stoichiometry of the main extracted species was confirmed to be UO_2(NO_3)_2·2DMDOSA and UO_2(NO_3)_2·2DMDDSA,*** of the extraction reactions are *** spectral study of the U(Ⅵ) extracted species was also made.

关键词：溶剂萃取二甲基环己烷 ftir光谱硝酸铀酰化学计量比 O3浓度萃取反应

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Responses of soil ammonia oxidizers to a short-term severe mercury stress

引用

Journal of Environmental Sciences 2015年第12期27卷 8-13页

作者： Zhi-Feng Zhou Yu-Rong Liu guo-xin sun Yuan-Ming Zheng College of Resources and Environment Southwest University State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

The responses of soil ammonia-oxidizing archaea（AOA） and ammonia-oxidizing bacteria（AOB） to mercury（Hg） stress were investigated through a short-term incubation *** with four different concentrations of Hg（CK,Hg25,Hg50,and Hg100,denoting 0,25,50,and 100 mg Hg/kg dry soil,respectively）,samples were harvested after 3,7,and 28 day *** showed that the soil potential nitrification rate（PNR） was significantly inhibited by Hg stress during the ***,lower abundances of AOA（the highest in CK： 9.20 × 10~7 copies/g dry soil; the lowest in Hg50： 2.68 × 10~7 copies/g dry soil） and AOB（the highest in CK： 2.68 × 10~7 copies/g dry soil; the lowest in Hg50：7.49 × 10~6 copies/g dry soil） were observed only at day 28 of incubation（P 〈 0.05）.Moreover,only the community structure of soil AOB obviously shifted under Hg stress as seen through DGGE profiles,which revealed that 2-3 distinct AOB bands emerged in the Hg treatments at day *** summary,soil PNR might be a very useful parameter to assess acute Hg stress on soil ecosystems,and the community structure of soil AOB might be a realistic biological indicator for the assessment of heavy metal stress on soil ecosystems in the future.

关键词： Mercury (Hg) Potential nitrification rate (PNR) Amonia oxidizers Abundance Community structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extraction of lanthanide ions with N,N,N′,N′-tetrabutyl-3-oxadiglycolamide from nitric acid media

引用

Nuclear Science and Techniques 2017年第6期28卷 190-195页

作者： Xiu-Jing Peng Yu Cui Ji-Fei Ma Yulan Li guo-xin sun School of Chemistry and Chemical Engineering University of Jinan Shanghai Institute of Applied Physics Chinese Academy of Sciences

Extractability and extraction mechanism of lanthanide ions were investigated by using a new extractant,N,Nn,N′,N′-tetrabutyl-3-oxa-diglycolamide(TBDGA),in toluene from nitric acid *** effects of HNO_3 and TBDGA concentrations,and temperature,on extraction of lanthanide ions were *** of the main extracted species were HNO_3·TBDGA and M(NO_3)_3-3TBDGA(M = Er,Dy,Tb,Gd,La,Ce,Nd,Sm and Eu).The extracted species for metal ions were established to be ionic *** this complex,nitrate anion was not coordinated to the central *** extraction pattern increased gradually across the lanthanide ions series,showing enhanced affinity of TBDGA toward heavy lanthanide *** parameters were investigated for the exothermic extraction reaction.

关键词： Lanthanide ions Extraction N,N,N,N-tetrabutyl-3-oxa-diglycolamide Nitric acid Toluene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid evaluation of arsenic contamination in paddy soils using field portable X-ray fluorescence spectrometry

引用

Journal of Environmental Sciences 2018年第2期30卷 345-351页

作者： Jian-Hong Liang Pan-Pan Liu Zheng Chen guo-xin sun Hong Li Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification Institute of Karst Geology Chinese Academy of Geological Sciences Guilin 541004 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Department of Environmental Science Xi' an Jiaotong-Liverpool University Suzhou 215123 China College of Urban Construction and Environmental Engineering Chongqing University Chongqing 400045 China

Arsenic（As） in paddy fields is deteriorating food security and human health through rice ingestion. Rice is the dominant food source of arsenic exposure to half of the world’s population. Therefore, an in situ effective method for As risk evaluation in paddy soil is strongly needed to avoid As exposure through rice ingestion. Herein, we developed a rapid analytical methodology for determination of As in plant tissues using field portable X-ray fluorescence spectrometry（FP-XRF）. This method was applied to rice roots in order to evaluate the As contamination in paddy soils. The results showed that rice roots with iron plaques were superior to rhizosphere soils for generating FP-XRF signals, especially for field sites with As concentrations lower than the soil detection limit of FP-XRF（30.0 mg/kg）.Moreover, the strong linear relationships of As concentrations between the rice roots and corresponding leaves and grains proved that the rice root, rather than the soil, is a better predictor of As concentrations in rice grains. The research provides an efficient As monitoring method for As contaminated paddy fields by using wetland plant roots with iron plaques and XRF-based analytical techniques.

关键词： XRF Arsenic Risk evaluation Rice roots Rhizosphere soils Iron plaque

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Separation of hafnium from zirconium in hydrochloric acid solution with di(2-ethylhexyl)phosphoric acid by solvent extraction

引用

Nuclear Science and Techniques 2019年第2期30卷 53-59页

作者： Tao Yang guo-xin sun Yuan Qian Ji-Fei Ma Yu-Lan Li School of Chemistry and Chemical Engineering University of Jinan Shanghai Institute of Applied Physics Chinese Academy of Sciences

The preparation of nuclear-grade zirconium and hafnium is very important for nuclear power. The separation of hafnium from zirconium in a hydrochloric acid solution by solvent extraction was investigated with di(2-ethylhexyl)phosphoric acid(D2 EHPA). The effects of hydrochloric acid concentration, extractant concentration,diluents, and temperature on the distribution coefficient of hafnium and zirconium were studied. The species extracted were ZrOA_2·2 HA and HfOA_2-2 HA. In this process, the separation factors varied with different diluents and followed the order octane > hexane > toluene > chloroform.A high separation factor value of 4.16 was obtained under the conditions of a solution containing 0.05 mol/L HCl and0.01 mol/L D2 EHPA for the separation of hafnium from zirconium. The extraction reaction was endothermic.

关键词： Zirconium Hafnium D2EHPA Solvent extraction Separation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Mn-porphyrinic metal–organic framework immobilizing glucose oxidase for combined photodynamic/chemodynamic/starvation therapy

引用

Tungsten 2025年第1期7卷 183-194页

作者： xin-Ran sun Hao-Ming Yuan guo-Da Zhang Chao Wang Shu-Juan sun Peng-Fei Shi Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers School of Chemistry and Chemical Engineering Linyi University

The combination of photodynamic therapy（PDT） and chemodynamic therapy（CDT） in tumor treatment has attracted considerable ***,tumor hypoxia and glutathione（GSH） overproduction in the tumor tissue restricted the progress of their ***,a Mn-porphyrinic metal-organic framework（Mn-TCPP） was constructed by the one-pot method and further used for immobilizing glucose oxidase（GOx） to obtain GOx@*** would rapidly exhaust endogenous glucose into hydrogen peroxide（H2O2） and gluconic acid,thus shutting off the energy supply of tumor cells for starvation ***-TCPP catalyzed H2O2to produce oxygen,regulating the hypoxic tumor microenvironment and in turn improving1O2generation under laser ***,Mn-TCPP can reduce reactive oxygen species consumption owing to the redox reaction between Mn3+and GSH,thus greatly enhancing ***,benefiting from GOx-mediated starvation therapy,Mn2+produced by Mn3+reduction can react with sufficient intracellular H2O2to generate ·OH with high cytotoxicity through a Fenton-like *** treatment by GOx@Mn-TCPP under laser irradiation in vitro,the cell viability of 4T1 and A549 tumor cells reached to 20%,reflecting GOx@Mn-TCPP could give full play to the advantages of PDT/CDT/starvation *** results in vivo demonstrated that GOx@Mn-TCPP mediated synergistic cascade therapy could significantly inhibit tumor growth and improve the therapeutic effect.

关键词： Chemodynamic therapy Immobilizing enzyme Metal–organic frameworks Photodynamic therapy Starvation therapy

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ZrO_2超细粉的烧结及相关过程研究

引用

无机材料学报 1993年第2期8卷 163-169页

作者：郭新孙尧卿崔昆华中理工大学

本文研究了 ZrO_2超细粉的烧结过程,并提出了相应的烧结模型.研究的结果表明,粉末团聚体内的粉末晶体之间发生优先烧结,根据热力学分析,这种优先烧结是通过同类型表面相互结合而实现的,它对于正常的烧结过程没有干扰作用,而粉末团聚体... 详细信息

本文研究了 ZrO_2超细粉的烧结过程,并提出了相应的烧结模型.研究的结果表明,粉末团聚体内的粉末晶体之间发生优先烧结,根据热力学分析,这种优先烧结是通过同类型表面相互结合而实现的,它对于正常的烧结过程没有干扰作用,而粉末团聚体之间的烧结对试样的致密化具有重大影响.同时,本文也讨论了试样表面气孔优先排除及试样表面平坦化这两个相关过程,根据热力学分析,认为这两个过程的作用机理可能是表面扩散及蒸发/凝结.

关键词：超细粉烧结氧化锆

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ZrO_2基固体电解质的时效特性研究

引用

无机材料学报 1993年第3期8卷 295-302页

作者：郭新孙尧卿崔昆华中理工大学

本文用交流阻抗法测量了 ZrO_2材料在940℃、时效222h 的过程中电阻率的变化,并用 XRD、EPMA、EDAX 及 TEM 分析了产生这种变化的原因.研究的结果表明,在时效的初期,ZrO_2晶粒中析出一种微细相,使得晶粒电阻率变大;在时效的后期,ZrO_2... 详细信息

本文用交流阻抗法测量了 ZrO_2材料在940℃、时效222h 的过程中电阻率的变化,并用 XRD、EPMA、EDAX 及 TEM 分析了产生这种变化的原因.研究的结果表明,在时效的初期,ZrO_2晶粒中析出一种微细相,使得晶粒电阻率变大;在时效的后期,ZrO_2晶界相发生相变,又使其晶界电阻率增大.1.5AYZ 试样在500℃时测量的电阻率值的时效动力学方程可表示为:ρ(t)=1962+0.81t^(1.1)(Ω·cm)

关键词：时效电阻率氧化锆固体电解质

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：