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Analysis of monomeric and oligomeric organophosphorus flame retardants in fish muscle tissues using liquid chromatographyeelectrospray ionization tandem mass spectrometry:Application to Nile tilapia(Oreochromis niloticus)from an e-waste processing area in northern Vietnam

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Emerging Contaminants 2016年第2期2卷 89-97页

作者： Hidenori Matsukami Go Suzuki nguyen minh tue Le Huu Tuyen Pham Hung Viet Shin Takahashi Shinsuke Tanabe Hidetaka Takigami Center for Material Cycles and Waste Management Research National Institute for Environmental Studies(NIES)16-2 OnogawaTsukuba305-8506Japan Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwa277-8563Japan Center for Marine Environmental Studies(CMES) Ehime University2-5 Bunkyo-choMatsuyama790-8577Japan Centre for Environmental Technology and Sustainable Development(CETASD) VNU Hanoi University of Science334 Nguyen TraiHanoiViet Nam Center of Advanced Technology for the Environment(CATE) Faculty of AgricultureEhime University3-5-7 TarumiMatsuyama790e8566Japan

Using electrospray ionization tandem mass spectrometry combined with liquid chromatography(LC),a novel analytical method was developed to quantify eight monomeric organophosphorus flame retardants(m-PFRs)and three oligomeric organophosphorus flame retardants(o-PFRs)in fish muscle *** optimization and validation experiments indicate that the developed method can determine accurately the concentrations of analytes in fish muscle *** recoveries of analytes in fish muscle samples were in the range of 74-105%.The coefficients of variation of the concentrations of analytes in fish muscle samples were 0.6-8.9%.The concentrations of analytes in procedural blanks were below the limit of quantification(LOQ)***,the developed method was applied to the analysis of m-PFRs and o-PFRs in the muscle samples of tilapias collected from an electronic waste(ewaste)processing area in northern *** concentrations of m-PFRs such as tris(2-chloroethyl)phosphate(TCEP),tris(2-chloroisopropyl)phosphate(TCIPP),and triphenyl phosphate(TPHP)were dominant among the investigated *** respective concentrations of TCEP,TCIPP,and TPHP were up to 160,300,and 230 ng g^-1 lipid weight,respectively,whereas those of o-PFRs were up to 10 ng g^-1 lipid *** results of this study indicate lower accumulation potential of o-PFRs compared with m-PFRs for the first time.

关键词： Monomeric organophosphorus flame retardants Oligomeric organophosphorus flame retardants Liquid chromatographyeelectrospray ionization tandem mass spectrometry Fish muscle tissue e-waste

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Hazardous metals emissions from e-waste-processing sites in a village in northern Vietnam

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Emerging Contaminants 2018年第1期4卷 11-21页

作者： Natsuyo Uchida Hidenori Matsukami Masayuki Someya nguyen minh tue Le Huu Tuyen Pham Hung Viet Shin Takahashi Shinsuke Tanabe Go Suzuki Center for Material Cycles and Waste Management Research National Institute for Environmental Studies(NIES)16-2 OnogawaTsukubaIbaraki305-8506Japan Tokyo Metropolitan Research Institute for Environmental Protection 1-7-5 Shinsuna KotoTokyo136-0075Japan Center for Marine Environmental Studies(CMES) Ehime University2-5 Bunkyo-choMatsuyama790-8577Japan Center for Environmental Technology and Sustainable Development(CETASD) Hanoi University of Science334 Nguyen TraiHanoiViet Nam Center of Advanced Technology for the Environment Graduate School of AgricultureEhime University3-5-7 TarumiMatsuyama790-8566Japan

Inappropriate e-waste-processing operation is a serious issue in developing countries since the early 2000'*** research was conducted to clarify its influences and diffuse toxic substances in the environment at e-waste-processing sites in a village in northern Vietnam from 2012 to *** investigated surface soil samples collected from e-waste-processing sites,open burning sites,and rice paddy *** samples and water samples were also collected from a river that runs through the *** hazardous metal concentration in soil and river sediment samples indicated that 7 elements(Ca,Cu,Mo,Ni,Pb,Sn,and Zn)had high concentrations as a result of *** notably,Pb and Cu had high concentrations in soil samples(Pb:26e2200 mg/kg,Cu:22e3000 mg/kg).The results of a multivariate analysis indicated that these 7 elements were closely correlated with *** of hazardous metals showed an upward trend where e-waste-processing occurred during the 3-year study period,although it was not significant statistically at *** burning activity had a great influence on Cu accumulation,and maximum Cu concentrations increased from 340 mg/kg in 2012e3000 mg/kg in 2014 in soil samples from open-burning *** were large differences in the dominant hazardous metal depending on the type of e-waste-processing workshop because hazardous metal composition was influenced by the types of e-waste and the processing *** is necessary to avoid e-waste processing in open-air environment to control emissions of hazardous ***,open burning should be prohibited.

关键词： E-waste-processing Open burning Soil pollution Hazardous metal

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Comprehensive evaluation of dioxins and dioxin-like compounds in surface soils and river sediments from e-waste-processing sites in a village in northern Vietnam:Heading towards the environmentally sound management of e-waste

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Emerging Contaminants 2016年第2期2卷 98-108页

作者： Go Suzuki Masayuki Someya Hidenori Matsukami nguyen minh tue Natsuyo Uchida Le Huu Tuyen Pham Hung Viet Shin Takahashi Shinsuke Tanabe Abraham Brouwer Hidetaka Takigami Center for Material Cycles and Waste Management Research National Institute for Environmental Studies(NIES)Tsukuba 305-8506Japan Tokyo Metropolitan Research Institute for Environmental Protection 1-7-5 Shinsuna KotoTokyo 136-0075Japan Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwa 277-8563Japan Center for Marine Environmental Studies Ehime UniversityMatsuyama 790-8577Japan Research Centre for Environmental Technology and Sustainable Development(CETASD) VNU Hanoi University of Science334 Nguyen TraiHanoiViet Nam Center of Advanced Technology for the Environment Faculty of AgricultureEhime University3-5-7 TarumiMatsuyama 790-8566Japan BioDetection Systems 1098 XH AmsterdamThe Netherlands

The management of electronic waste(e-waste),which can be a source of both useful materials and toxic substances,depending on the processing method,is important for promoting material *** this study,we used the dioxin-responsive chemical-activated luciferase gene expression(DR-CALUX)assay combined with gas chromatographyehigh-resolution mass spectrometry to evaluate the levels of dioxin-like compounds in surface soils and river sediments collected in and around an e-waste-processing village in northern *** WHO-TEQs(Toxic equivalents)of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs),coplanar polychlorinated biphenyls(Co-PCBs),and polybrominated dibenzo-pdioxins and dibenzofurans(PBDD/Fs)in soils collected in January 2012 ranged from 0.29 to 310 pg/g(median 2.9 pg/g,n=32),and the WHO-TEQs in sediments ranged from 0.96 to 58 pg/g(median 4.4 pg/g,n=8).Dioxin-like activities(CALUX-TEQs[2,3,7,8-TCDD equivalent])in soils collected in January 2012,2013,and 2014 ranged from<30 to 4300 pg/g(median<30 pg/g,n=96),and the activities in sediments ranged from<30 to 4000 pg/g(median 33 pg/g,n=24).Dioxin-like compounds accumulated in samples collected around e-waste-processing areas such as open-burning sites and e-waste-processing workshops,and the compounds may be transported from their sources to surrounding areas over the course of several *** of the CALUX-TEQs,but not WHO-TEQs,values were higher than the maximum acceptable WHO-TEQs promulgated by various authorities,indicating that all dioxin-like compounds should be evaluated in samples collected from e-waste-processing *** findings suggest that open burning and open storage of e-waste should be prohibited and that wastewater treatment should be implemented at each workshop to reduce contamination by dioxin-like compounds from e-waste.

关键词： Dioxin Brominated dioxin E-waste Open burning CALUX

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Occurrence of emerging flame retardants from e-waste recycling activities in the northern part of Vietnam

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Emerging Contaminants 2016年第2期2卷 58-65页

作者： Masayuki Someya Go Suzuki Alin C.Ionas nguyen minh tue Fuchao Xu Hidenori Matsukami Adrian Covaci Le Huu Tuyen Pham Hung Viet Shin Takahashi Shinsuke Tanabe Hidetaka Takigami Tokyo Metropolitan Research Institute for Environmental Protection 1-7-5 Shinsuna KotoTokyo 136-0075Japan Center for Material Cycles and Waste Management Research National Institute for Environmental Studies(NIES)16-2 OnogawaTsukuba 305-8506Japan Toxicological Centre University of AntwerpUniversiteitsplein 12610 WilrijkBelgium Center for Marine Environmental Studies Ehime University2-5 Bunkyo-choMatsuyama 790-8577Japan Centre for Environmental Technology and Sustainable Development Hanoi University of Science334 Nguyen TraiHanoiViet Nam

This study investigated the contamination status of 21 emerging flame retardants(FRs)in soils(n=32)and river sediments(n=8)from an e-waste recycling(EWR)site in the northern part of *** analyzed FRs,higher levels of decabromodiphenyl ethane(DBDPE)(NDe4200 ng/g dw),1,2-bis-(2,4,6-tribromophenoxy)ethane(BTBPE)(NDe350 ng/g dw)and Dechlorane Plus isomers(DPs)(NDe65 ng/g dw)were found in soils near EWR workshops and open burning *** highest concentrations of DBDPE(20 ng/g dw),BTBPE(5.7 ng/g dw)and DPs(6.7 ng/g dw)were also detected in sediments collected from the middle of the EWR *** levels decreased concomitantly with increasing distance from the EWR *** results indicate that these FRs were released to the surrounding environment from improper recycling activities,such as manual dismantling of devices and open burning of ***,the estimated daily intakes of those FRs via soil ingestion were approximately ten times higher for children than *** our knowledge,this is a first comprehensive study on characterization of soil and sediment contamination by a series of emerging FRs at an EWR site in Vietnam.

关键词： Emerging flame retardants e-waste Soil Sediment Vietnam

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Consideration of Viscoelasticity in Time Step FEM-Based Restraint Analyses of Hardening Concrete

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Journal of Modern Physics 2013年第10期4卷 9-14页

作者： Dirk Schlicke nguyen Viet tue Institute of Structural Concrete Graz University of Technology Graz Austria

Concrete structures may suffer considerable restraint stresses during their hardening period. This is caused by several deformation impacts, especially temperature field changings due to hydration heat and volume changes due to autogenous shrinkage. Mainly affected are massive concrete members, but also the application of new concrete types or the erection of outstanding constructions requires further investigations in this context. 3D-FEM analyses of hydration heat induced temperature development in combination with the well known shrinkage give sufficient results for the deformation impact. The according elastic restraint stresses can be determined with consideration of the concrete’s rising elastic modulus and the restraint degree of the system. But due to duration of the heat flow process, the height of restraint stresses is strongly dependent from the viscoelasticity of the concrete. The viscoelastic effects consist of many components constituted by changing material properties influencing themselves. In practice, different simplified approaches are available for considering this in calculations. Their implementation in time step analyses is not generally admitted and requires expertise. In contrast, present research develops material models needing specific input parameters for every use case. This contribution focuses on a practicable approach considering the superposition of the viscoelastic behaviour of every stress increment in time step FEM analysis. The differentiation between the pure viscoelastic material behaviour (as it is given in the codes for idealistic conditions like creep or relaxation) and the according viscoelastic system response (addicted to the systems variable restraint degree) allows the transfer of this model into practice. As one application example of this approach, the compatibility check and the FEM-based recalculation of the monitoring program of a massive power plant slab will be presented.

关键词： Viscoelasticity Hardening Mass Concrete FEM Restraint Analysis Time Dependant Material Properties Hydration Heat Evolution of Stiffness Quantification of Restraint Stresses In-Situ Measurements Recalculation of Measurement Data

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Comparative Analysis on Fruit Qualities of Longan Varieties form Vietnam

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Agricultural Science & Technology 2011年第10期12卷 1461-1463页

作者：张晓芳罗心平刘光华黄家雄张惠云 nguyen Dinh tue TRAN Mihn Hoa 云南省农业科学院热带亚热带经济作物研究所云南保山678025 越南农业科学院北部山区农林研究所

[Objective] The aim was to screen longan varieties suitable for local production in Vietnam.[Method] The fruit botanical characteristics and quality characteristics of longan varieties introduced into Northern Mountainous Agriculture and Forestry Science Institute of Vietnam Academy of Agriculture Sciences were compared and analyzed.[Result] Two varieties with good general qualities including PMP6 and PHS1-1 which were suitable to be cultivated in the local area were *** addition,Phu Dong was the available processed germplasm resource.[Conclusion] This research will provide reference for longan production and breeding in Northern Mountainous.

关键词： Vietnam longan Comparative analysis of fruit qualities Variety selection

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Comparison of HIV Testing among Children and Adults with Tuberculosis, Vietnam

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Journal of Tuberculosis Research 2017年第4期5卷 292-297页

作者： Tyson Volkmann Binh nguyen Ebelechukwu G. Anyalechi Kimberly N. Chapman Hedges Ho Van Anh Pham Quang tue nguyen Viet Nhung Eleanor S. Click Division of Global HIV and TB Centers for Disease Control and Prevention Atlanta USA Division of Tuberculosis Elimination Centers for Disease Control and Prevention Atlanta USA Vietnam National Tuberculosis Program Hanoi Vietnam

HIV testing among persons with tuberculosis (TB) results in high-yield identification of persons infected with HIV. To evaluate differences in HIV testing among children versus adults with TB in Vietnam, we collected and analyzed age-disaggregated facility and aggregated provincial data from the National Tuberculosis Program. HIV testing was incompletely documented for >70% of children, whereas adult testing data were >90% complete. Standardized training of personnel for universal HIV testing and documentation for children with TB could improve HIV case-detection and permit linking of children with HIV to antiretroviral treatment to prevent morbidity and mortality.

关键词： Surveillance Operational Research Childhood TB Pediatric

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Comparative Analysis on Fruit Qualities of 7 Litchi Varieties from Vietnam

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Agricultural Science & Technology 2010年第8期11卷 110-113页

作者：张晓芳刘光华罗心平黄家雄吕玉兰娄予强 nguyen Dinh tue Tran Mihn Hoa 云南省农业科学院热带亚热带经济作物研究所云南保山678025 越南农业科学院北部山区农林研究所

[Objective] The aim was to screen litchi varieties suitable for local production in Vietnam. [Method] The fruit botanical and quality characteristics of the seven litchi varieties introduced into Northern Mountainous Agriculture and Forestry Science Institute of Vietnam Academy of Agriculture Sciences were compared and analyzed. [Result] Three varieties with good general qualities including Lai Phu Ho,Thach Binh and Hung Long which were suitable to be cultivated in the local area were selected. In addition,Phu Dong was the available,early-maturing germplasm resource. [Conclusion] This research will provide reference for litchi production and breeding in northern mountainous area.

关键词： Vietnam litchi Comparative analysis of fruit qualities Variety selection

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