• Title, Summary, Keyword: chemical components

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창원시 대산면 취수 부지의 지하수와 낙동강의 수리화학적 특성 비교

  • Ham Se-Yeong;Jeong Jae-Yeol;Lee Jeong-Hwan;Kim Hyeong-Su;Ryu Sang-Hun;Kim Tae-Won;Kim Mun-Su
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.307-311
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    • 2006
  • Chemical analyses were conducted for Nakdong River water and riverbank filtrate in Daesan-Myeon area, Changwon City in 2005. Chemical components show different trends in wet season (June, July, August and September) and dry season (the other months). The patterns of chemical variation are classified into four types. Chemical components belonging Type I, as Na and $HCO_3$, show decrease in concentration during wet season and increase in concentration during dry season for both Nakdong River water and the riverbank filtrate. Chemical components belonging Type II, as Mg and $SO_4$, show decrease in concentration during wet season and increase in concentration during dry season for Nakdong River water while show the opposite trend for the riverbank filtrate. Chemical components belonging Type III, as Cl and $NO_3$, show increase in concentration from the start of wet season and high concentration during dry season for both Nakdong River water and the riverbank filtrate. Chemical components belonging Type IV, as Fe, show increase in concentration during wet season and decrease in concentration during dry season for both Nakdong River water and the riverbank filtrate.

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Three-Dimensional Visualization for Chemical Components within Rice Particle With a Microslicer-Infrared Microscope System

  • Do, Gab-Soo;Kudoh, Ken-Ichi;Furushiro, Naomichi;Koyama, Ryo;Higuchi, Toshiro;Sagara, Yasuyuki
    • Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
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    • pp.1531-1531
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    • 2001
  • A novel technique has been developed to observe the three-dimensional (3-D) distribution of chemical components in biological materials using both automatic sectioning microtome and infrared microscope. The 3-D image was reconstructed based on the relationship between the content and the absorbancy of specified wavelength for chemical components. By using the automatic sectioning microtome, the kernel of rice sample fixed in paraffin was sequentially sliced with the thickness of $5\;\mutextrm{m}$ after pasting the sliced sectional specimens on an adhesive tape. The chemical components of the specimens, which are placed on the X-Y controlling stage with positioning accuracy of ${\pm}10\;\mutextrm{m}$, were analyzed by the infrared microscope. The 3-D images demonstrated that the zonal protein about $200\mutextrm{m}$ in width was observed mainly at the outer parts of a rice particle, and carbohydrates entirely. These images can be observed by choosing arbitrary observation angle. The result indicated that the developed technique could be applied 3-D information to investigate intrinsic chemical components but also residual pesticides as well as bacteria contamination for agricultural produce.

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A Quantitative Resolution of Overlapped Chromatographic Fractions by Target Transformation Factor Analysis

  • Ihn Chong Lee;Seungwon Kim;Chul Lee;Sang Won Choi
    • Bulletin of the Korean Chemical Society
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    • v.12 no.3
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    • pp.304-309
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    • 1991
  • Target transformation factor analysis is applied to analyze the components of unresolved fraction in the elution curve of La, Pr and Gd which is obtained using the chelate agent- impregnated resin and 0.7 M hydrochloric acid as an eluent. We determined the number of components contributing to the unresolved fractions and verified the presence of suspected components.

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Characteristics of Mineral and Thermal Waters in South Korea (II) (한국 온천수의 수질적 특성(II))

  • 임정웅
    • Journal of the Korean Professional Engineers Association
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    • v.33 no.1
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    • pp.75-82
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    • 2000
  • 299 chemical analyses are used to study the characteristics of mineral and thermal waters in South Korea. Even though the concentration of chemical components in thermal waters are generally very low, mineral waters having components more than 1,000 ppm of dissolved total solid(TDS) are reached up to 1975 of total analyses data, In Germany, Japan or some other countries, mineral and thermal waters are defined not only by water temperature, but also by chemical components. The principle of Law in Japan is also almost same with the German regulations. However, the Law for thermal spring In Korea permit thermal water to be qualifiled only by water temperature. For including chemical characters into the regulations or Law of thermal spring, the limit values of TDS and other 9 micro components related to mineral and thermal waters was selected through this study.

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Studies on the Change of Chemical Components of Flue-cured Tobacco with Maturity (황색종 잎담배의 숙도에 따른 화학성분의 변화연구)

  • Hwang, Geon-Jung;Kim, Jeong-Hwan;Kim, Chan-Ho
    • Journal of the Korean Society of Tobacco Science
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    • v.3 no.1
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    • pp.20-24
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    • 1981
  • This experiment was carried out to determine the relationships between maturity and content of the chemical components in flue-cured tobacco. The results were as follows : 1) Among the chemical components, the contents of total nitrogen, ammonia nitrogen, total alkaloids, nicotine, total volatile base, petroleum-ether extract, crude fiber, crude ash, water soluble ash, and chlorine decreased significantly, and those of total sugar, reducing sugar, and starch increased as leaf maturity progressed until the stage of ripeness, but, afterwards, a reverse tendency appeared. 2) There was a significant relationship between maturity and the contents of chemical components, such as total nitrogen, protein nitrogen, ammonia nitrogen, total volatile base, and the correlation coefficients of them were -0.743, -0.789, -0.797, and -0.642, respectively.

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Chemical components of aqueous humor in Korean native cattle and Holstein-friesian cattle (한우 및 젖소 전방수의 화학조성)

  • Shin, Ho-chul
    • Korean Journal of Veterinary Research
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    • v.36 no.3
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    • pp.743-745
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    • 1996
  • Chemical components of bovine aqueous humor were analyzed. Significant levels of protein, urea nitrogen, creatinine, cholesterol, calcium and electrolytes including sodium, potassium and chloride were detected. The composition of bovine aqueous humor is similar to that of cerebrospinal fluids, rather than that of plasma. It was also found that there is no significant difference in most components between aqueous humor of Korean native cattle and that of Holstein-Friesian cattle.

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Effects of Organic Matters Decomposed by Microbial Activity on Yield of Leaf Lettuce Under Protected Cultivation (미생물 유기질비료의 시용이 상추의 수량에 미치는 영향)

  • 김경제;김석균
    • Korean Journal of Organic Agriculture
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    • v.8 no.1
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    • pp.131-137
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    • 1999
  • This study was conducted to investigate the effects of microbial fertilizers on the yields of Leaf lettuce, chemical components of soil, and the microbial floras. Six micriobial fertilizers, MPK+Husk+Palma, Husk+Palma, MPK+Compost, Compost, Bio livestock cattle system(BLCS) cattle dropping, and Tomi, were used. All of the microbial fertilizers were tend to increase yields of Leaf lettuce, especially MPK+Husk+Palma treatment was most effective. In a chemical components of soil, concentrations of K, Mg were increased with Tomi treatment, however, the other concentrations of soil chemical components were not different. In a microbial floras of soil, Tomi, Husk+Palma, and MPK+Husk+Palma treated plots increased in numbers of total bacteria and bacillus. Tomi treated plot increased in numbers of actinomycetes and fungi, also. The other microbial floras of soil were not different, however. The microbial fertilizers may affect the useful microbial floras, therefore, it would be increase yield of Leaf lettuce treated with them.

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The Changes in the Chemical Components and Antioxidant Activities in Ecklonia Cava According to the Drying Methods (건조방법에 따른 해조류(감태)의 주요성분 및 항산화 활성의 변화)

  • 김진아;이종미
    • Journal of the Korean Home Economics Association
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    • v.42 no.5
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    • pp.193-203
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    • 2004
  • This study examined the changes in the chemical components and antioxidant activity of Ecklonia cava according to the drying methods. As chemical components, the concentrations of minerals(K, Ca, Na, Mg, Fe, Cu, Mn and Zn), vitamins(vitamin C, ${\beta}$-carotene and ${\alpha}$-tocopherol) and the total polyphenols were analyzed. In additions, the antioxidant activity was determined by measuring the free radical(DPPH radical, superoxide anion radical, hydroxyl radical and hydrogen peroxide) scavenging activity and the linoleic acid peroxidation inhibitory activity. The mineral content was not affected by the drying methods. However, more vitamins were lost and the total polyphenol concentration was reduced as a result of sun-drying than by the other drying methods used. More of the total polyphenol was preserved by freezing-drying than by any of the other drying methods, which meant that there was a higher antioxidant activity after freeze drying.

Conversion of biomass components to methyl levulinate over an ultra-high performance fiber catalyst in impellers of the agitation system

  • Shi, Xian-Lei;Hu, Qianqian;Chen, Yongju;Wang, Feng;Duan, Peigao
    • Journal of Industrial and Engineering Chemistry
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    • v.65
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    • pp.264-271
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    • 2018
  • An ultra-high performance fiber, serving as a novel material for heterogeneous-acid catalyst for the conversion of biomass components to methyl levulinate, is presented. The catalyst was prepared conveniently from commercially available polyphenylene sulfide fiber by sulfonation, and characterized detailedly by elemental analysis, FTIR spectroscopy, SEM and mechanical strength at different stages. Moreover, the catalyst exhibited higher activity for biomass components transforming into methyl levulinate (52-96%), and prominent ability to be reused with good recyclability and stability. Furthermore, the effective large-scale process with fiber catalyst in impellers of the agitation system is very attractive for the industrial applications.

Interaction effect of Chemical Mixtures (혼합물에서 화학물질간의 상호작용 효과)

  • Leem Jong Han;Shin Joo-Youn;Kim Yong-Kyu
    • Journal of The Korean Society of Clinical Toxicology
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    • v.3 no.1
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    • pp.11-16
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    • 2005
  • Chemical mixtures of components, each of which are present at less than guidance concentrations, may be hazardous due to additivity, interactions, or both. Toxicological interactions may increase the health hazard above what would be expected from an assessment of each component singly, or all components additively. So chemical mixture are a particular issue in public health. There are several approach to assess whether there are additivity or interaction in assessing toxicological effects, such as, components-based approach, physiologically-based pharmacokinetic /pharmacodynamic(PBPK/PD) models, hazard index method, and weight-of evidence method. If we consider interaction or additivity effects in assessing the health effects of chemcial mixtures, we can get more accurate information about toxicological effects and dose-response relationship in chemical mixtures.

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