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음철헌,김본경,강동영,이승호 한국분석과학회 2012 분석과학 Vol.25 No.6
Asian dust particles are known to have sizes ranging from a few nanometers up to about a few micrometers. The environmental and health effects depend on the size of the dust particles. The smaller, the farther they are transported, and the deeper they penetrate into the human respiratory system. Sedimentation field-flow fractionation (SdFFF) provides separation of nano to microparticles using a combination of centrifugal force and parabolic laminar flow in a channel. In this study, the steric mode of SdFFF (Sd/StFFF) was tested for size-based separation and characterization of Asian dust particles. Various SdFFF experimental parameters including flow rate, stop-flow time and field strength of the centrifugal field were optimized for the size analysis of Asian dust. The Sd/StFFF calibration curve showed a good linearity with R2 value of 0.9983, and results showed an excellent capability of Sd/StFFF for a size-based separation of micron-sized particles.The optical microscopy (OM) was also used to study the size and the shape of the dust particles. The size distributions of the samples collected during a thick dust period were shifted towards larger sizes than those of the samples collected during thin dust periods. It was also observed that size distribution of the sample collected during dry period shifts further towards larger sizes than that of the samples collected during raining period, suggesting the sizes of the dust particle decrease during raining periods as the components adsorbed on the surface of the dust particles were removed by the rain water. Results show Sd/StFFFis a useful tool for size characterization of environmental particles such as the Asian dust.
5,7-dihalo-8-hydroxyquinoline-XAD-7 침윤수지에 의한 금속이온의 흡착 및 회수에 관한 연구
이택혁,음철헌 培材大學校 1985 論文集 Vol.7 No.-
The Amberlite XAD-7 resin impergnated with 8-Hydroxyquinoline derivatives(DCHQ, DBHQ, DIHQ) has been studied to be applied to the selective and quantitative adsorption and recovery of some metal ions such as Cu(Ⅱ), Ni(Ⅱ) and Zn(Ⅱ) from the various aqueous solution. Distribution coefficient and impregnated capacity of DXHQ on XAD-7 resin was as follows : DCHQ < DBHQ < DIHQ. In considering acidity of DXHQ, the order increases as follows DCHQ < DBHQ < DIHQ. The impregnation capacities of XAD-7 resin for DXHQ were 9.06×10??mmol DCHQ/g, XAD-7, 1.5×10??mmol DBHQ/g, XAD-7, 1.81×10??mmol DIHQ/g, XAD-7 respectively. The DCHQ-impregnated-XAD-7 resin was stable in pH range from 4.0 to 8.0, DBHQ and DIHQ-impregnated-XAD-7 resin were stable in pH range from 3.0 to 7.0. Amounts of adsorbed metal ions were consistent in mole ratio in forming metal complex, The adsorbed metal ion was quantitatively recovered by HCI solution. Stability of M-DXHQ on XAD-7 resin increases as the electronegativity of the substituent decrease M-DCHQ-XAD-7<M-DBHQ-XAD-7<M-DIHQ-XAD-7.