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Derivation of soil Pb/Cd/As thresholds for safety of vegetable planting: A case study for pakchoi in Guangdong Province,China

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Journal of Integrative Agriculture 2019年第1期18卷 179-189页

作者： LI Fu-rong WEN Dian WANG Fu-hua SUN Fang-fang WANG Xu DU Ying-qiong LIU Xiang-xiang WAN Kai Public Monitoring center for agro-product of Guangdong Academy of Agricultural Sciences/Key Laboratory of testing and Evaluation for agro-product safety and quality Ministry of Agriculture/Laboratory of Quality & Safety Risk Assessment for Agro-product (Guangzhou)Ministry of Agriculture

Regional guidelines for soil heavy metals,in conjunction with specific crops,are proposed to better assess soil environmental *** this study,large amounts of soils with different levels of Pb/Cd/As pollution were collected in Guangdong Province,China,to carry out a pot experiment,which was closer to the actual situation and properties of the heavy metal contaminated *** the widely planted vegetable pakchoi as the research object,we analyzed the correlations between the Pb/Cd/As concentrations in pakchoi and the total or available soil Pb/Cd/As concentrations and established their optimal regression *** then,the total and available soil Pb/Cd/As thresholds for pakchoi were calculated according to the allowable Pb/Cd/As limits in pakchoi and were compared with the current soil assessment ***,a lot of paired vegetable-soil samples in field were collected and their pollution situations were assessed by both the current limit thresholds and the calculated ***,it was more consistent to assess the Cd and As pollution situation of the vegetable and soil samples with the calculated soil thresholds than the current soil assessment *** further proved that it was necessary to explore the soil heavy metal thresholds for safety of vegetable in specific regions,which would be more scientific and practical to guide safety production of local agricultural products and effective utilization of soil resources.

关键词： heavy metal pollution available content soil threshold correlation analysis vegetable

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Analysis of Phospholipids in Crucian Carp(Carassius auratus) Muscle by Offline HPLC-MALDI-TOF MS

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Chemical Research in Chinese Universities 2011年第3期27卷 371-374页

作者： LI Guo-chen WANG Yan-hong WU Ren-an WANG Shi-cheng inspection and testing center of agro-product safety and environment quality Institute of Applied EcologyChinese Academy of SciencesShenyang 110016P.R.China National Chromatographic Research&Analysis center Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China

The interest in the analysis of phospholipids(PLs), especially phosphatidylcholine(PC), has been increasing due to the importance of them in biochemistry as well as in industry. A method was reported based on the offline combination of MALDI-TOF MS and normal-phase HPLC for analyzing PLs extracted from crucian carp. Total PLs of crucian carp were extracted and then separated by HPLC before the collected subfractions were analyzed by MALDI-TOF MS. The mass spectra obtained show peaks of H+, Na+ and K+ adducts of PC molecules. It is shown that the prior separation of PLs by HPLC is highly necessary to remove the signal suppressing and to avoid the possible overlapping. With this method, 9 possible PC molecules in crucian carp and the corresponding fatty acid compositions were given from the well-resolved mass spectra.

关键词： Phospholipid Phosphatidylcholine Phosphatidylethanolamine Sphingomyelin HPLC MALDI Crucian Carp

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Time effects of rice straw and engineered bacteria on reduction of exogenous Cu mobility in three typical Chinese soils

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Pedosphere 2022年第5期32卷 665-672页

作者： Hanzhi SHI Dian WEN Yongdong HUANG Shoujun XU Tenghaobo DENG Furong LI Zhichao WU Xu WANG Peihua ZHAO Fuhua WANG Ruiying DU Institute of quality Standard and Monitoring Technology for agro-products Guangdong Academy of Agricultural SciencesGuangzhou 510640(China) Key Laboratory of testing and Evaluation for agro-product safety and quality Ministry of Agriculture and Rural AffairsGuangzhou 510640(China) Guangdong Provincial Key Laboratory of quality&safety Risk Assessment for agro-products Guangzhou 510640(China)

Globally,copper(Cu)accumulation in soils is a major environmental *** organic waste and some bacterial species can readily absorb metals in an eco-friendly manner,and thus are commonly used in metal-contaminated soil *** study investigates the change in Cu fractions during the aging process and the time effects of rice straw(RS)and engineered bacteria(EB)(Pseudomonas putida X4/pIME)on reduction of Cu *** typical Chinese soils(red,cinnamon,and black soils)were incubated with RS or RS+EB in the presence of exogenous Cu for 24 *** soil physicochemical properties,reactive soil components,Cu fractions,and Cu mobility were determined over *** Cu mobility factor(MF)values were the lowest in the black soil(6.4-9.2)because of its high organic carbon and clay *** additions of both RS and RS+EB accelerated Cu stabilization during the aging process in all three *** Cu MF values decreased with time during the initial 20 months;however,the MF values increased thereafter in all soils,which might be due to the reduction of humic substances and amorphous iron oxides and the increase in iron oxides complexed on the organic *** reduction rates of Cu MF were similar after 16,24,and more than 24 months in the red,cinnamon,and black soils,respectively,indicating that RS and RS+EB could limit Cu mobility at different times in various *** RS treatment showed the greatest efficiency in reducing Cu mobility in the red,cinnamon,and black soils after 12,12,and 8 months of incubation,*** RS+EB treatment was more efficient than the RS treatment in the red soil during the initial 8 months of the incubation *** study provides theoretical support for Cu risk assessments and RS supplementation for Cu remediation in different soils.

关键词： aging Cu distribution mobility factor sequential extraction soil incubation

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Characterization and biodegradation kinetics of a new cold-adapted carbamazepine-degrading bacterium, Pseudomonas sp. CBZ-4

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Journal of environmental Sciences 2013年第11期25卷 2281-2290页

作者： Ang Li Rui Cai Di Cui Tian Qiu Changlong Pang Jixian Yang Fang Ma Nanqi Ren State Key Laboratory of Urban Water Resource and environment Harbin Institute of Technology National Supervision and inspection center of environmental Protection Equipment quality Yixing Urban Supervision andInspection Administration of Product Quality

Carbamazepine is frequently detected in waters and hardly eliminated during conventional wastewater treatment processes due to its complicated chemical structure and resistance to biodegradation. A carbamazepine-degrading bacterium named CBZ-4 was isolated at a low temperature （10℃） from activated sludge in a municipal wastewater treatment plant. Strain CBZ-4, which can use carbamazepine as its sole source of carbon and energy, was identified as Pseudomonas sp. by the 16S rRNA gene sequence. The composition and percentage of fatty acids, which can reveal the cold-adaptation mechanism of strain CBZ-4, were determined. Strain CBZ-4 can effectively degrade carbamazepine at optimal conditions： pH 7.0, 10℃, 150 r/min rotation speed, and 13% inoculation volume. The average removal rate of carbamazepine was 46.6% after 144 hr of incubation. The biodegradation kinetics of carbamazepine by CBZ-4 was fitted via the Monod model. Vmax and Ks were found to be 0.0094 hr^-1 and 32.5 mg/L, respectively.

关键词： carbamazepine low temperatures biodegradation kinetics Pseudomonas sp.

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Interaction Between Ustilaginoidea virens and Rice and Its Sustainable Control

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Rice science 2024年第3期31卷 269-284页

作者： ZHANG Fengmin CAO Zhenzhen ZHENG Xin HE Yuntao CHEN Mingxue LIN Xiaoyan Rice product quality inspection&Supervision testing center of Ministry of Agriculture and Rural Affairs China National Rice Research InstituteHangzhou 310006China

Ustilaginoidea virens is a common rice pathogen that can easily lead to a decline in rice quality and the production of toxins pose potential risks to human *** this review,we present a comprehensive literature review of research since the discovery of rice false *** provide a comprehensive and,at times,critical overview of the main results and findings from related research,and propose future research ***,we delve into the interaction between *** and rice,including the regulation of transcription factors,the process of *** infecting rice panicles,and the plant immune response caused by rice *** that,we discuss the identification and characterization of mycotoxins produced by the pathogenic fungus,as well as strategies for disease *** emphasize the importance of comprehensive agricultural prevention and control methods for the sustainable management of *** knowledge will update our understanding of the interaction between *** and rice plants,offering a valuable perspective for those interested in ***.

关键词： rice false smut flower-specific infection mycotoxin food safety plant disease

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Oxidation of diclofenac by birnessite: Identification of products and proposed transformation pathway

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Journal of environmental Sciences 2020年第12期32卷 169-178页

作者： Yue Zhao Fei Liu Min Wang Xiaopeng Qin Institute of quality Standards and testing Technology for agro-products Key Laboratory of Agro-Product Quality and SafetyChinese Academy of Agricultural SciencesBeijing 100081China School of Water Resources and environment and Beijing Key Laboratory of Water Resources and Environmental EngineeringChina University of Geosciences(Beijing)Beijing 100083China Department of Technology Assessment Technical Centre for SoilAgricultural and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China

Diclofenac(DCF), a widely used non-steroidal anti-inflammatory, reacted readily with birnessite under mild conditions, and the pseudo first order kinetic constants achieved 8.84 × 10^-2 hr^-1. Five products of DCF including an iminoquinone product(2,5-iminoquinone-diclofenac) and four dimer products were observed and identified by tandem mass spectrometry during the reaction. Meanwhile, 2,5-iminoquinone-diclofenac was identified to be the major product, accounting for 83.09% of the transformed DCF. According to the results of spectroscopic Mn(III) trapping experiments and X-ray Photoelectron Spectroscopy, Mn(IV) contained in birnessite solid was consumed and mainly converted into Mn(III) during reaction process, which proved that the removal of DCF by birnessite was through oxidation. Based on the identified products of DCF and the changes of Mn valence state in birnessite solid, a tentative transformation pathway of DCF was proposed.

关键词： Birnessite Diclofenac Oxidation mechanism Transformation pathway Emerging contaminants

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Technical progress of China’s national remote sensing mapping:from mapping western China to national dynamic mapping

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Geo-Spatial Information Science 2021年第1期24卷 121-133,I0013页

作者： Jixian Zhang Haiyan Gu Wei Hou Chunquan Cheng National quality inspection and testing center for Surveying and Mapping products State BeijingChina Chinese Academy of Surveying and Mapping BeijingChina

Remote sensing mapping is an important research direction in the development of geographic surveying and *** order to successfully implement the project of Mapping Western China(MWC),a technical mapping system has been *** this project,many problems have been solved through technological innovation,such as block adjustment with scarce control points,large-scale aerial/satellite image mapping,and intelligent interpretation of multi-source *** softwares were developed,*** for aerial/satellite image mapping in a large area,FeatureStation for the integration of multi-source data in the complex terrain areas,and an airborne multi-band and multi-polarization interferometric data acquisition system for SAR *** the first time,full coverage of 1:50,000 topographic data of China’s land territory has been produced,which means the geospatial framework of digital China is basically *** the implementation of other key national plans and projects(*** geographic conditions monitoring and national remote sensing mapping),the focus has changed from MWC to national dynamic ***,a dynamic mapping system is *** data acquisition capability has developed from a single source to multiple sources and multiple *** mapping capability has developed into dynamic mapping,and the capability for database update shows the characteristics of *** national geographic condition monitoring creates a multi-scale index system for statistical analysis for various needs.A multi-level and multi-dimensional technical system for statistical computing and decision-making service is developed for the transformation from dynamic monitoring to information *** this paper,we give a brief introduction about the recent development of remote sensing mapping in China with respect to data acquisition,map production,and information *** purpose of this paper is to motivate the establishment

关键词： Remote sensing mapping mapping western China national dynamic monitoring data acquisition image interpretation information service

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Effect of stress profile on microstructure evolution of cold-drawn commercially pure aluminum wire analyzed by finite element simulation

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Journal of Materials Science & Technology 2018年第7期34卷 1214-1221页

作者： Y.K.Zhu Q.Y.Chen Q.Wang H.Y.Yu R.Li J.P.Hou Z.J.Zhang G.P.Zhang Z.F.Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences National quality Supervision & inspection center of Electrical Equipment safety Performance Zhejiang Huadian Equipment Testing Institute

The evolution of microstructure in the drawing process of commercially pure aluminum wire （CPAW） does not only depend on the nature of materials, but also on the stress profile. In this study, the effect of stress profile on the texture evolution of the CPAW was systematically investigated by combining the numerical simulation and the microstructure observation. The results show that the tensile stress at the wire center promotes the formation of 〈111〉 texture, whereas the shear stress nearby the rim makes little contribution to the texture formation. Therefore, the 〈111 〉 texture at the wire center is stronger than that in the surface layer, which also results in a higher microhardness at the center of the CPAW under axial loading.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Commercially pure aluminum wire Cold drawing Texture Finite element simulation Stress profile

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A quantitative research on the level of disturbance to secondary signal ports of electronic voltage transformers under the operation of gas‐insulated switchgear

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High Voltage 2022年第1期7卷 165-175页

作者： Qi Wang Chao Fu Fanwu Chu Yue Tong Xiaozhou Wang Guoxiong Ye Xiong Wu Power Industry Electrical Equipment quality inspection and testing center China Electric Power Research InstituteWuhanChina

The collectors of electronic transformers has the problem of electromagnetic in-compatibility under the operation of disconnecting switches,which limits their wide application in smart *** evaluate the maximum level of disturbance that collectors are able to withstand in the stochastic process of switching operation,this work in-troduces a quantitative approach based on limited test measurements,which can quantify the level of disturbance in the signal acquisition ports of electronic voltage transformers(EVT)in different gas‐insulated switchgears(GIS).Based on large numbers of experi-mental statistical data of the true type simulation experimental platform,the Spearman rank correlation coefficient is used to prove that the amplitude of the disturbance voltage pulse at the secondary side port and the breakdown voltage between the primary side fracture approximately satisfy a linear ***,the quantile regression model is used to quantify and verify the maximum disturbance level of the secondary side ***,a solution is proposed to tackle the difficulty in obtaining the breakdown voltage at breaks in the GIS substation field applicatvion,under which the quantified maximum disturbance voltage deviation of secondary ports is only−4.34%by *** research work can further explore the practical value of the measured data in a few tests under GIS substation field conditions and provide references for the sub-sequent revision of EVT‐related standards.

关键词： disturbance operation electronic

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Simultaneous identification and quantification of tetrodotoxin in fresh pufferfish and pufferfish-based products using immunoaffinity columns and liquid chromatography/quadrupole-linear ion trap mass spectrometry

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Chinese Journal of Oceanology and Limnology 2017年第4期35卷 883-893页

作者：郭萌萌吴海燕江涛谭志军赵春霞郑关超李兆新翟毓秀 Key Laboratory of testing and Evaluation for Aquatic product safety and quality Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery Sciences National center for quality Supervision and Test of Aquatic products Key Laboratory of Food safety Risk Assessment Ministry of HealthChina National Center for Food Safety Risk Assessment

In this study, we established a comprehensive method for simultaneous identification and quantification of tetrodotoxin （TTX） in fresh pufferfish tissues and pufferfish-based products using liquid chromatography/quadrupole-linear ion trap mass spectrometry （LC-QqLIT-MS）. TTX was extracted by 1% acetic acid-methanol, and most of the lipids were then removed by freezing lipid precipitation, followed by purification and concentration using immunoaffinity columns （IACs）. Matrix effects were substantially reduced due to the high specificity of the IACs, and thus, background interference was avoided. Quantitation analysis was therefore performed using an external calibration curve with standards prepared in mobile phase. The method was evaluated by fortifying samples at 1, 10, and 100 ng/g, respectively, and the recoveries ranged from 75.8%--107%, with a relative standard deviation of less than 15%. The TTX calibration curves were linear over the range of 1-1 000 ~tg/L, with a detection limit of 0.3 ng/g and a quantification limit of 1 ng/g. Using this method, samples can be further analyzed using an information- dependent acquisition （IDA） experiment, in the positive mode, from a single liquid chromatography-tandem mass spectrometry injection, which can provide an extra level of confirmation by matching the full product ion spectra acquired for a standard sample with those from an enhanced product ion （EPI） library. The scheduled multiple reaction monitoring method enabled TTX to be screened for, and TTX was positively identified using the IDA and EPI spectra. This method was successfully applied to analyze a total of 206 samples of fresh pufferfish tissues and pufferfish-based products. The results from this study show that the proposed method can be used to quantify and identify TTX in a single run with excellent sensitivity and reproducibility, and is suitable for the analysis of complex matrix pufferfish samples.

关键词： tetrodotoxin fresh pufferfish pufferfish-based product immunoaffinity column liquidchromatography/quadrupole-linear ion trap mass spectrometry

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