Metal bioaccumulation in fishes and macro zooplankton in some lakes in Ha Noi - Pham Thi HongMetal accumulated differently in liver, gill, and muscle. Among the fish’s organs, liver had highest metal concentration. The Zn accumulation in muscle significantly correlated to water temperature. There were no correlation between tropic status and the metal accumulation in fish’s organs. A variation of metal concentrations in macro zooplankto...
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Modification of oxidized activated carbon surface by fe and mn for arsenic removal from aquerous solution - Pham Thi Hai ThinhIn order to improving adsorption properties of AC for arsenic, manganese and iron were impregnated on oxidized activated carbon. From this research, the effect of pH is significant on adsorption capacities of As (III) and As (V). The OAC-Fe, OAC-Mn gives more adsorption capacity of all types of arsenic species than that of AC-Fe, AC-Mn. OAC-Mn a...
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Investigation and ecological risk assessment of pb, as and hg in sediment of Tam Giang-Cau hai lagoon, Thua Thien Hue province - Duong Van HieuContamination of heavy metals in the sediment is an important problem for the lagoons. Basing on the investigation results from Sam Chuon lagoon, concentration of heavy metals was met the criteria standard of Viet Nam for the sediment, except for Hg at some stations. However, calculation of risk indices showed that Sam Chuon lagoon are polluted ...
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Study of copper removal in water by ion exchange material - Pham Thi Hang HaiFTIR spectrum showed that PS and PSW after being modified by H2SO4 contained –SO3H functional group, and the appearance of –SO3H in PSW is more remarkable comparing to PS. PSW-S, shows a much higher adsorption efficiency of Cu (II) comparing to PS-S (74.13 and 9.61% respectively). The set of optimal conditions for the 8 mm-diameter ion exchange ...
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Phosphate removal from aqueous solution by using modified sludge from water treatment plant - Dang Thi Thanh LocSludge modified by humic acid (in a weight ratio of 10:1) and heated at 600 °C showed a great chemically and physically activated adsorbent. SEM image indicated that the porous structural aspects of the MS suitable for removing P from aqueous solution. The optimum adsorption conditions for the adsorption of MS are 10 mg/L initial P concentration...
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Acute toxicity of the ethanol extract and ethyl acetate fraction of eupatorium fortunei to daphnia magna - Pham Thanh NgaThe present work indicated that the ethanol extract and its ethyl acetate fraction of Eupatorium fortunei Turcz had the different acute toxicity to D. magna after 24 and 48 hours of exposure. The ethanol extract was less toxic to D. magna with LC50-24h and LC50-48h of 247 and 183 mg.L-1, respectively. In terms of ethyl acetate fraction, the valu...
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Energy consumption and air emission inventory for transportation sectors of Viet Nam - Pham Thi HueAs calculated in Vietnam 2016, total energy consumption and CO2 emission of N3, N27÷N35, N36 are 15.90 Mtoe and 44.20 Mt, respectively. The results show the biggest contribution of transport activities in term of energy consumption and air emissions of Vietnamese economy. The study also evidences that among transportation service sectors, the r...
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A comparison of the cytotoxic activity of extracts from fruiting bodies and mycelial biomass of cordyceps neovolkiana (dl004) fungus - Nguyen Chi DungOur research showed that the mycelial biomass extracts of Cordyceps neovolkiana fungus have tronger cytotoxic activity against MCF-7 and Jurkat T cells than the fruit bodies in three extracts: EtOH, PE and EA. This result was helpful and useful to the development of C.neovolkiana cultivation process for efficient production of functional foods o...
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Effects of substituents on ch bond dissociation enthalpies of ent-Kaurane diterpenoids: a dft study - Ngo Dang Truong HaiIn this study, the BDE thermochemical parameter characterizing for HAT antioxidant mechanism of seven ent-kaurane diterpenoids extracted from Croton tonkinensis Gagnep. has been calculated using density functional theory (DFT) method. The obtained results reveal that BDEs calculated at M05-2X/6-31+G(d) vary from 83.8 to 90.9 kcal/mol. These stud...
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Mechanical properties and flame resistance of composite based on high density polyethylene/ethylene vinyl acetate blend and novel organically modified waste gypsum - Tran Huu TrungGypsum filler was successfully modified by EBS using melt-mixing method at 155 oC for 30 minutes. Stretching vibration of H-O-H shifted from 1,623 cm-1 to 1,629 cm-1 could be assigned to the hydrogen bonds between –OH groups of gypsum and amide groups of EBS. By adding 5 wt.% APP and 3 wt% ZB into HDPE/EVA/Gyp composite, the material reached V2 ...
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