• 제목/요약/키워드: sea-salt

검색결과 523건 처리시간 0.027초

서울시 부유분진중 해염입자에 의한 입자상 nitrate농도 (Concentration of Particulate Nitrate Originated from Sea Salt in Seoul Ambient Air)

  • 천만영;이영재;김희강
    • 한국대기환경학회지
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    • 제10권3호
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    • pp.191-196
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    • 1994
  • Concentration of particulate nitrate originated from sea salt in ambient air was determined from February to October 1993. Sampling was carried out using a two-stage Anderson air sampler at the top of a five-story building located at Kon-Kuk University in Seoul. Concentration of NaNO$_3$, which originated from sea salt was highest in spring time and lowest in summer the and the concentration range was between 0.10 and 0.66 $\mu\textrm{g}$/㎥. NaNO$_3$/TSP ratio was very low 0.05~0.39%) indicating that the portion of NaNO$_3$ in TSP was negligible.

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Low-Z Electron Probe X-ray Microanalysis 분석법을 이용한 해안인근 지역의 대기입자 분석 (Characterization of Individual Atmospheric Particles, Collected in Susan, Korea, Using Low-Z Electron Probe X-ray Microanalysis)

  • 김혜경;노철언
    • 한국대기환경학회지
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    • 제19권5호
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    • pp.503-513
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    • 2003
  • A single particle analytical technique, called low-Z electron probe X-ray microanalysis (low-Z EPMA) was applied to characterize atmospheric particles collected in Busan, Korea, over a daytime period in Dec. 2001. The ability to quantitatively analyze the low-Z elements, such as C, N, and 0, in microscopic volume enables the low-Z EPMA to specify the chemical composition of individual atmospheric particle. Various types of atmospheric particles such as organics, carbon-rich, aluminosilicates, silicon oxide, calcium carbonate, iron oxide, sodium chloride, sodium nitrate, ammonium sulfate, and titanium oxide were identified. In the sample collected in Busan, sodium nitrate particles produced as a result of the reaction between sea salt and nitrogen oxides in the atmosphere were most abundantly encountered both in the coarse and fine fractions. On the contrary, original sea salt particles were rarely observed. The fact that most of the carbonaceous particles were distributed in the fine fraction implies that their origin is anthropogenic.

Salt and Sand Transport from Aral Sea Basin

  • 이귀주
    • 한국해양공학회지
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    • 제19권3호
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    • pp.47-53
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    • 2005
  • Model for dust and salt transportation from the dried bottom of the Aral Sea is suggested. Theoretical analysis is based on the turbulent diffusion equation for the averaged function of passive impurity concentration. One-layer model of the atmospheric boundary layer is assumed. Impurity precipitation rates are calculated as the functions of the particle size and the distance source of particles. Analytical solutions for the point and two-dimensional sources of impurities are found. Model calculations for salt and sand transport from the Aral Sea basin are made on the basis of 2D source model with a constant intensity.

포천지역에서 측정한 $PM_{10}$중 2차 생성입자에 관한 연구 (The Study on Secondary Pollutants of $PM_{10}$ in Pocheon)

  • 박태술
    • 환경위생공학
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    • 제20권4호통권58호
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    • pp.9-20
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    • 2005
  • The purpose of the study was characteristics of secondary pollutants of $PM_{10}$ collected in pocheon between August 2002 and June 2003. The ambient concentrations of $PM_{10}$ mass, 9 water-soluble anions and cations, and 13 bulk composition trace elements were determined from filter samples collected by $PM_{10}$ high volume air sampler(UV-15H, Graseby-Anderson Co., USA). During this period average $PM_{10}$ mass concentration was $83.8{\mu}g/m^3(49.8{\mu}g/m^3\~111.6{\mu}g/m^3)$ in Pocheon. Mechanism for transformation of secondary pollutants by soluble ion components is divided into two categories; $NaNO_3$ type by the reaction of sea salt and $HNO_3$ in the atmosphere, and nitrate salt or phosphate salt type such as $(NH_4)_2SO_4,\;NH_4NaSO_4,\;and\;(NH_4)_2SO_4(2NH_4O_3)$.

콘크리트 밀실화에 의한 염해대책 및 방청효과에 관한 실험적 연구 (제2보, 철근의 부식 현황을 중심으로) (An Experimental Study on the Effect of Corrosion Protection by Tighting Concrete Used Fly-ash and Silica Fume (Part2, In the case of Steel Bar s Corrosion))

  • 이상수;김진만;남상일;김문한;김무한
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1994년도 봄 학술발표회 논문집
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    • pp.148-151
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    • 1994
  • Up to now, sea sand without complete removal of salt is being used in the construction works because there is little satisfactory counterplan for the substitute aggregate. In the case that such sea sand is used in the reinforced concrete, the residual salt gives rise to deterioration phenmenon and iron corrosion, reducing durability of the ferro-concrete structures. The paper, an experimental study on the effect of corrosion protection by tighting concrete used SF and FA, is to investigate general steel bar's corrosion and to develop concrete using sea sand economically after it is analyzed and examinated ratio of the corrosion area affected by the autoclave cycle. As a test results, as for corrosion area ratio, it is very effective to use admixrutes such as SF and FA which decrease corrosion area remarkably with increasing the amounts of admixtures. Accordingly the use of admixtures is advantageous for tightening concrete and has an effect of salt damage prevention and rust protection in concrete used sea sand.

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Chemical Transformation of Individual Asian Dust Particles Estimated by the Novel Double Detector System of Micro-PIXE

  • Ma, Chang-Jin
    • Asian Journal of Atmospheric Environment
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    • 제4권2호
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    • pp.106-114
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    • 2010
  • By the application of novel double detector system of micro-PIXE that can detect light elements (Z<14), we made an attempt to provide a thorough discussion on the aging processes of Asian dust (hereafter called "AD") particle by reaction with sea-slat. The elemental spectra and maps obtained from the microbeam radiation of micro-PIXE to individual AD particles were useful for fractionating AD particles into both internally and externally mixed particles. A spatial distribution of elements in a minute domain of single particle obtained by scanning the microbeam irradiation enabled us not only to estimate the chemical mixing state of individual AD particles but also to presume their aging processes in both ambient air and cloud. By calculating the normalized micro-PIXE net count of elements, it was possible to classify individual AD particles into three distinct groups (i.e., (1) Aging type 1: AD particle coated by the gaseous Cl evaporated by the reaction between artificial acids and sea salt; (2) Aging type 2: AD particle mixed with sea salt but no additional reaction with artificial acids; and (3) Non-aged type) A relatively high transformation rate (63.3-75.9%) was shown in large particles (greater than $5.1\;{\mu}m$ in diameter).

조선시대(朝鮮時代) 자고(煮?) 생산과정(生産過程) - 동해안(東海岸)(영해(寧海))을 중심(中心)으로 - (Salt Production on the Young-Hea of Eastern Coast in Yi-dynasty)

  • 최성기
    • 한국식생활문화학회지
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    • 제1권3호
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    • pp.279-294
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    • 1986
  • In order to survey the traditional salt production at the eastern coast, Young-Hae, in Yi-dynasty, data of salt production were collected through interviewing with whom had received the skill from ancestors and analyzed the data. The results obtained were as follows. Salt-producer take the salt water containing much salt and then he transported the salt-water by having water buckets an back in with using the water-toting device (Mul ji ge). Finally he carried out the irrigation (Mul dae gi) to a ditch (Dorang). It is noteworthy that the East-sea salt production method was not selecting a method of salt-pond style with a bank for salt production but using the salt water transportation fashion without a bank for that. Judging from these facts, we could conclude that traditional salt production method was handed down into the Yi-dynasty from ancient times.

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소금의 종류별 미네랄 함량과 외형구조 비교연구 (Comparison of Mineral Content and External Structure of Various Salts)

  • 박건영;하정옥
    • 한국식품영양과학회지
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    • 제27권3호
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    • pp.413-418
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    • 1998
  • There are several types of salts that classifed into raw salts(Chunil salt, Saeng salt), purified salts (NaCl reagent grade, Hanju salt) and processed salts(Gueun salt, Saeng kum, Bamboo salt) in Korea. Their major element is NaCl but raw salt from sea water contains other minerals such as K, Mg and S. Mineral contents of the various kinds of salt analyzed with ICP-AES and AAS were different, especially on the contents of K, Mg and Ca. Chunil salt was abundant in Ca(1,037ppm), K(3,707ppm), Mg(10,266ppm) and S(7,459ppm), and salt water from the Chunil salt contained small amounts of Pb, Al, Cr and Hg. Processed salts contained high levels of Ca, K, Mg and Fe. Especially, high levels of K, P, Fe and Ge were detected in bamboo salt. Purified salts showed regular crystal form and raw salts exhibited irregular crystal form under the SEM. The processed salts were not crystal form, but fused and irregular round form.

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오존을 이용한 유기물 및 세균의 제거 특성에 관한 연구 (A Study on the Removal Characteristics of Organic matter and Bacteria with the Use of Ozone)

  • 이관영;박상현
    • 한국산업융합학회 논문집
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    • 제10권1호
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    • pp.15-20
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    • 2007
  • The aim of this study is to measure the removal characteristics of organic matter and bacteria with the use of ozone to reduce the problems caused by bacteria and organic matter which appear in sea-water is summer season. When the total input of ozone was $1.4mg/{\ell}O_3$, the removal rate of bacteria and E-coli from sea-water proved to be 100%. With the same input of ozone, on the other hand, the removal rate of COD turned to be relatively low, 50%, which was to the fact that sea-water consists of salt matter which is a kind of COD matter. This result supports the idea that we can keep using ozone steadily in the future to remove organic matters and bacteria from sea-water because ozone destructs relatively less salt matter in sea-water. Also, the treatment effect rate of SS, turbidity and organic matters such as $NH_3$-N, $NO_3$-N etc, was very high. As a result, we assume that the treatment of organic matter in sea-water with ozone is very effective

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애자류의 염해대책에 관한 기초연구 (A basic study on preventing insulators from salt accident)

  • 김원섭
    • 전기의세계
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    • 제18권1호
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    • pp.11-14
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    • 1969
  • This paper shows experimentally one method of preventing porcelain insulators from salt accident likely to be caused in the region of sea coast. In this experiment some results that, if a conductor barrier is inserted into the flash over discharge path which is wetted by salt dissolved water, the flash over voltage found to be raised up, were gotten. This results may be actually applied to suspension insulator or bushing to prevent them from salt accidents.

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