• Title/Summary/Keyword: Atomic Absorption

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Effect of Deuterated Solvents on the Excited State Photophysical Properties of Curcumin

  • Barik, A.;Goel, N.K.;Priyadarsini, K.I.;Mohan, Hari
    • Journal of Photoscience
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    • v.11 no.3
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    • pp.95-99
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    • 2004
  • Optical absorption and emission studies have been carried out to understand the effect of deuterium on the solvent dependent photophysical properties of curcumin in deuterated solvents such as $CDCl_3,\;(CD_3)_2SO,\;(CD_3)_2CO,\;CD_3OD\;and\;CD_3CN$. Optical absorption spectral studies showed that there is no significant shift in absorption maxima compared to the non-deuterated solvent. The fluorescence maxima shows significant shift with polarity of solvent but not much affected by the deuteration. The fluorescence quantum yield of curcumin increased marginally in almost all the deuterated solvents, indicating reduction in the non-radiative pathways. The fluorescence decay was biexponential in all the solvents and the average fluorescence lifetime was not much affected with deuteration, but showed decrease with increasing solvent polarity. Based on these studies, it is concluded that intermolecular hydrogen transfer is only partially responsible for the excited state deactivation of curcumin.

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Graphite Furnace Atomic Absorption Spectrophotometric Determination of Trace Horseradish Peroxidase Using Nanosilver

  • Jiang, Zhi-Liang;Tang, Ya-Fang;Wei, Lin;Liang, Ai-Hui
    • Bulletin of the Korean Chemical Society
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    • v.32 no.8
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    • pp.2732-2736
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    • 2011
  • In pH 4.2 HAc-NaAc buffer solution, horseradish peroxidase (HRP) catalyzed $H_2O_2$ oxidation of nanosilver to form $Ag^+$. After centrifugation, $Ag^+$ in the supernatant can be measured by graphite furnace atomic absorption spectrophotometry (GFAAS) at the silver absorption wavelength of 328.1 nm. When HRP concentration increased, the $Ag^+$ concentration in the supernatant increased, and the absorption value enhanced. The HRP concentration in the range of 0.84-50 $ng{\cdot}mL^{-1}$ was linear to the enhanced absorption value (${\Delta}A$), with a regression equation of ${\Delta}A$=0.012C+0.11, correlation coefficient of 0.9988, and detection limit of 0.41 $ng{\cdot}mL^{-1}$ HRP. The proposed GFAAS method was used to detect HRP in waste water samples, with satisfactory results.

Analytical Application of Glow Discharge Atomic Absorption Spectroscopy (GD-AAS) Using Three Types of Jet Configurations Under Power Mode

  • Hwang, Jun Ho;Lee, Ki Beom;Kim, Min Su;Lee, Seong Ro;Kim, Hasuck;Kim, Hyo Jin;Lee, Gae Ho
    • Analytical Science and Technology
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    • v.8 no.4
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    • pp.443-448
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    • 1995
  • Three anode configurations of six-jet, cone-jet and cylindrical-jet are tested for their analytical performance under power mode operation. The effect of pressure, power and gas flow rate on atomic absorption signals have been studied. The increase of atomic absorption signal of sample element is observed at a fixed pressure in all configurations as the gas flow rate increase up to 300-600 seem, and as the power dissipated in the glow discharge cell increase. The lower the pressure is in the glow discharge cell at a fixed discharge power and argon flow rate, the greater the absorbance of sample element is. The optimum conditions are taken from these data and a calibration curve of Cu in low-alloy steel sample is obtained. In this calibration curve, six-jet configuration shows the best analytical results varies as the sample element.

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Direct analysis of steels with a gas-jet assisted glow discharge lamp for atomic absorption spectrometry (글로우방전을 이용한 철강시료의 직접분석법에 관한 연구)

  • Kim, Hyo Jin;Woo, Jin Chun;Lim, Heoung Bin;Moon, Dae Won;Lee, Kwang Woo
    • Analytical Science and Technology
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    • v.5 no.2
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    • pp.185-190
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    • 1992
  • A gas-jet assisted glow discharge lamp was attached to a conventional atomic absorption spectrophotometer in the place of a flame burner. To evaluate the accuracy of this method, the certified values and the analyzed values of SRM's were compared and atomic absorption sensitivity for five elements were also obtained. Factors affecting the sensitivity and areas for future improvement are discussed.

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Changes of Heavy Metal Concentration in Rat's Tissues and Urine after Cd-administration (카드뮴 투여에 의한 흰쥐 조직 및 소변내 중금속 농도의 변화)

  • Cheon, Gi-Jeong;Kim, Bong-Hui
    • YAKHAK HOEJI
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    • v.40 no.5
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    • pp.501-506
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    • 1996
  • This study was conducted to investigate on the changes of copper and zinc concentration in rat's tissues and urine after cadmium administration with atomic absorption spectroph otometric method. It is found that cadmium appeared to cause a change in the behavior of copper and zinc in vivo system even during 1 month after cadmium treatment.

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X-ray Absorption Near-edge Studies of Au1-xPtx alloys

  • Y.D. Chung;Lim, K.Y.;Lee, Y.S.;C.N.Whang;Park, B.S.;Y.Jeon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2000.02a
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    • pp.164-164
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    • 2000
  • Since Au-Pt alloys have various atomic structures depending upon composition and annealing temperature, it is very interesting to investigate the electronic structures of alloys. We studied the changes of the electronic structure I the Au-Pt alloys by x-ray absorption near edge spectroscopy (XANES). Two kinds of Au-Pt alloy samples were prepared by arc melting methods and ion-beam-mixing technique. The Pt L2, 3-edge and Au L2, 3-edge X-ray absorption spectra (XPS) were measured with the electron yield mode detector at the 3C1 beam line of the Pohang Light Source (PLS). It was found that there was a substantial decrease in the area of the Pt L2, 3 white lines compared with that of pure Pt. The observed decrease in white line area was attributed to an increase in the number of pure Pt. The observed decrease in white line area was attributed to an increase in the number of 5d-electrons at the Pt site upon alloy formation. However, the Au L2, 3 edge spectra for Au-Pt alloys are all similar to that of pure Au. This implies that the 5d hole count of Au is not changed by alloy formation with Pt.

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Optimization of Parameters for Simultaneous Multielemental Analysis by Atomic Absorption Spectrometry (원자흡수분광법에 의한 다원소 동시분석시 조건의 최적화)

  • Kim, Hyo Jin;Kang, Jong Seong
    • Analytical Science and Technology
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    • v.6 no.4
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    • pp.359-362
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    • 1993
  • To find compromise experimental conditions that will allow a group of elements to be run on flame atomic absorption spectrometer without changing the burner height or gas flow rates, measurements were carried out. The optimum absorbance for simultaneous analysis of ten elements was observed at high flow rate of air-$C_2H_2$ as fuel and at 2mm of burner height. At the condition, 73% of mean relative absorbance were achieved.

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Determination of Inorganic Elements in Paddy Soils by Atomic Absorption Spectrophotometry (원자흡광법(原子吸光法)에 의(依)한 답토괴(沓土壞)의 미량원소(微量元素) 정량(定量))

  • Hwang, Jae-Soon
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.10 no.1
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    • pp.107-116
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    • 1981
  • This experiment was attempted to establish the optimal condition, e.g., the effects of pH, interferences of other elements, for the determination of the inorganic elements in the paddy soils by atomic absorption spectrophotometry. Inorganic elements of 100 paddy soils which were sampled in Jeon bug provincial farm land were determined by atomic absorption spectrophotometer in that condition. The results obtained in this experiment are summarized as follows: 1) The optimal pH for determination of inorganic elements in paddy soils is about 7.0. 2) It was investigated that the absorbance of potassium was increased, and that of calcium, magnesium and zinc was decreased by adding of $Fe^{++}$ and $Cu^{++}$ in the sample. 3) It was shown that paddy soils in Jeonbug provincial farm land contain the normal amounts of inorganic elements (K, Ca, Mg, Zn,). But comparing to the results of 1976 year, it was known that the contents of inorganic elements in paddy soils considerably was changed.

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