• YAKHAK HOEJI
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• v.39 no.2
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• pp.148-152
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• 1995

For comparison between the compromised experimental condition and the best conditions for each element by flame atomic absorption spectrometer, the absorbances were measured with changing the burner height and HCL current. The optimum absorbance for simultaneous analysis of 6 elements was observed at 1 mA of HCL current and at 4 mm of burner height except Cr and Co. The stability of flame atomic absorption spectrometer on each element was found to be better than 5%. To investigated the accuracy of this instrument, POSCO RM-07 as a real sample was analysed at these compromised experimental conditions and found to be better than 0.04%.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2002.05a
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• pp.41-47
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• 2002

A model of simultaneous heat and mass transfer process in absorption of refrigerant vapor into a lithium bromide solution of water-cooled vertical plate absorber was developed. The model can predict temperature and concentration profiles as well as the absorption heat and mass fluxes, the total heat and mass transfer rates and the heat and mass transfer coefficients. Besides, the effect of operating condition on absorption mass flux has been investigated, with the result that the absorption mass flux is increased as the inlet cooling water temperature decreases, the system pressure increases and the inlet solution concentration increases. And among the effects of operating parameters on absorption mass flux, the effect of inlet solution concentration is dominant.

• 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.

• Journal of the Korean Society of Combustion
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• v.17 no.1
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• pp.12-21
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• 2012

Simultaneous measurements of oxygen concentration and temperature using diode laser in the combustion environment are successfully accomplished. A single DFB type diode laser of 760 nm line centre frequency is used and the scanned-wavelength direct absorption spectroscopy method and wavelength modulation spectroscopy method are applied to measure absorption signals below 793 K temperature region. The experimental results show that oxygen concentration are measured within 1% accuracy and temperature are measured within 5% accuracy. This new method of simultaneous measurements of concentration and temperature with a single diode laser shows a great promise.

• Journal of Advanced Marine Engineering and Technology
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• v.28 no.4
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• pp.593-602
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• 2004

This paper is a study on the model of simultaneous heat and mass transfer process in the absorption of refrigerant vapor into a lithium bromide solution of water-cooled vertical plate absorber. The model can predict temperature and concentration profiles as well as the effect of Reynolds number on them. Also. the variations of the absorption heat and mass fluxes. and the heat and mass transfer coefficients have been investigated. The numerical result shows that the interface temperature and concentration decrease as film Reynolds number does. The absorption heat and mass fluxes, and the heat and mass transfer coefficients get their maximum values adjacent to the inlet solution. Analyses on a constant wall temperature condition have been also carried out to exam the reliability of the present numerical method by comparing to previous investigations.

• Korean Chemical Engineering Research
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• v.47 no.5
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• pp.639-645
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• 2009

In this study, alkanolamine was used to achieve high absorption rates for $CO_2$ as suggested at several literatures. The absorption rates of aqueous AMP and MEA solutions with $CO_2$, $SO_2$, $NO_2$ were measured using a stirredcell reactor. The reaction rate constants were determined from the measured absorption rates. The performances were evaluated under various operating conditions. As a result, the reactions with $SO_2$, $NO_2$ into aqueous AMP and MEA solutions were classified as an instantaneous reaction respectively. The absorption rates increased with increase of the reaction temperature and the concentration of absorbents. The simultaneous absorption rate of $CO_2/SO_2/NO_2$ into 3, 5, 10 wt.% MEA at various pressure of $CO_2/SO_2/NO_2$, was more increased 14~20% than AMP solution. We investigated the effect of $SO_2$ and $NO_2$ on the simultaneous absorption of $CO_2/SO_2/NO_2$ from a flue gas. The performances were evaluated under various operating conditions in order to investigate the absorption characteristic.

• Journal of the Korea Organic Resources Recycling Association
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• v.32 no.3
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• pp.43-56
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• 2024

In this study, we investigate wet absorption process and the performance and regeneration of Fe(II)EDTA^2- absorbents, electrodeposition of the reducing agent for recovery of metal powder and re-absorption performance using regenerated absorbed for the simultaneous removal of nitrogen oxides (NO) and sulfur oxides (SO₂) emitted from flue gas. As a result of a simultaneous absorption experiment of NO and SO₂ under the presence of oxygen, the antagonistic effects of SO₂ and O₂ in the absorption solution resulted in the regeneration of Fe(III)EDTA^- and Fe(II)EDTA-NO^2- to Fe(II)EDTA^2-, inducing the maintained neutral pH and maintained NO₂ absorption, thereby greatly improving the simultaneous absorption performance of NO and SO₂. In addition, after regenerating the Fe(II)EDTA^2- absorbent with Zn metal powder as a reducing agent, electrodeposition was performed to recover the remaining reducing agent. During the electrodeposition process, the high Zn recovery efficiency (approximately 57.50%) was observed at an applied voltage of 4 V, and the total absorption amount of NO was also significantly improved.

• Journal of Environmental Health Sciences
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• v.21 no.3
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• pp.87-95
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• 1995

A rapid and selective co-extraction systems of copper and zinc-thiocyanate complex into various types of alkylamine for the simultaneous determination of two metal ions by atomic absorption spectrometry and ion chromatograph have been proposed. The quantitative extractions of Cu(II) and Zn(II) at 0.1 M-thiocyanate and 0.1 M-HCI were achieved with Aliquat 336-$CHCl_3$. The detection limits of Cu and Zn were 2 ppb and 0.9 ppb respectively.

• International Journal of Air-Conditioning and Refrigeration
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• v.14 no.4
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• pp.131-137
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• 2006

The absorber in which heat and mass transfer phenomena occur simultaneously is one of the most critical components in the absorption system. It has the most significant influence on the performance and the size of the absorption system. During the absorption process, heat and mass transfer resistances exist in both liquid and vapor regions, so that the heat transfer mode should be carefully selected to reduce them. The objective of this paper is to review the previous papers analysing mathematical models of simultaneous heat and mass transfer phenomena during the absorption process. The most conventional working fluids ($H_2O$LiBr and $NH_3/H_2O$) are considered and the most common absorption modes (falling film and bubble mode) are dealt with in this review.

• Journal of the Korean Society of Food Science and Nutrition
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• v.11 no.4
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• pp.43-46
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• 1982

The purpose of this paper was to study the effect of surfactants on the absorption and the bioavailability of ascorbic acid in the small intestine of rats and rabbits absorption of ascorbic acid in small intestine of rats was increased with tween 80 and span 80.The blood level of ascorbic acid in rabbits was elevated by combined with low concentration of surfactants but high concentration of surfactants. The bioavailability of ascorbic acid was increased by simultaneous administration of surfactants.