간행물
한국환경과학회지 KCI 등재 Journal of Environmental Science International
- 발행기관 한국환경과학회
- 자료유형 학술지
- 간기 월간
- ISSN 1225-4517 (Print)2287-3503 (Online)
- 수록기간 1992 ~ 2023
- 주제분류 자연과학 > 자연과학일반 자연과학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제5권 제6호 (1996년 12월) 14건
1.
1996.12
서비스 종료(열람 제한)
Industrial ventilation is a crucial engineering measure to protect workers from hazardous airborne contaminants. Designing a ventilation system is not an easy task. To solve this problem, many U. S. computer programs and softwares have been developed. In Korea, asoftware, called as VPMC, was developed by Korea Industrial Safety Corporation. But VPMC could not stand alone since it can be used to design not a hood, but a ventilation system. In this research, therefore, a preprocessing software was developed. It can be used to design general ventilation system, canopy hood, open surface tank hood. The program was written in Microsoft Visual Basic. In near future, this software will be incorporated into a total package software which can be used to design a whole ventilation system.
2.
1996.12
서비스 종료(열람 제한)
For the efficient control of atmospheric quality, it is so important to predict the influence accurately of which the air pollutant emitted into the atmosphere. Atmospheric dispersion model enables to simulate and grasp the atmospheric condition occurred due to the emission of pollutants. The result of model is largely affected by the amount of emission, the characteristics of physical and chemical process, meteorological input data, and the receptor which the concentration is calculated.
The aim of this research, therefore, is to suggest more suitable model in Pusan area than other areas by performing TCM2, CDM2.0 and ISCLT2 models. As the basic work for executing the model, we computed the amount of emission of air pollutants in Pusan at 1992 and analyzed the occurrence frequency of atmospheric stability for recent decade(1985∼1994). CDM2.0 showed the similar result relatively with observed value in the case of full year(1992), fall and winter, and ISCLT2 brought more suitable result in spring for Pusan area.
As the result of this research, in future, it is necessary for us to develop the numerical model considering the topographical characteristics, to select the proper observation site and to increase the observation site for Pusan.
3.
1996.12
서비스 종료(열람 제한)
We identified two characteristic turbulent flow cases, weakening and strengthening, which appear at the downwind side. Observations were made two times, Dec. 2-3. 1995 and Feb. 13-14. 1996 at Pusan National University site located downwind side of Kumjeong mountain. Meteorological observation system, tethersonde, was adopted to present observation. In the case of the west wind which blows perpendicular to Sanghak mountain located westward from the site, the wind speed highly increased in exponential with height. Therefore, the low level wind speed was so weak just like Taylor(1988)`s review. While the wind speed was intensified at 200-400m layer when the northwest wind blows from the continental Siberian high. We suppose it is because of the strong vertical convergence of flow between the surface inversion layer and the upper one, and also the horizontal convergence along the saddle and valley between the two mountains, Kumjeong and Sanghak-because of Bernoulli`s effect. The inversion layer existed at surface-100m and 500-600m level and the strong wind existed at about 200-400m layer.
4.
1996.12
서비스 종료(열람 제한)
To research the cause of the low and the poor visibility phenomena of Kimhae international airport statistically, we analyzed the field routine data for the last five years from 1985 to 1989. The poor visibilities below l㎞, 3㎞, and 5㎞ usually occurred at about 6 o`clock in the morning under the condition of calm or light wind from south to southwest direction, and lasted for from 1 to 3 hours. They were caused by the radiative cooling and the inflow of moisture from the South Sea. The frequency of the low visibility(below 9㎞) recorded 48.1% a year. And the low visibility below 8㎞ with relative humidity below 70% often occurred in the case of southeast, southwest, and northwest wind. And it reveals a peak at 11:00 a.m.. It is supposed to be caused by the pollutants flowing from the neighbouring industrial complex, Sasang, Jangnim and by the photochemical reaction. And, when the industrial complex is built in Sinho, Myongji, Noksan located southwest, and Changyu area located northwest direction from Kimhae international airport, the visibility and the air pollution may become worse and worse by the increased pollutants.
5.
1996.12
서비스 종료(열람 제한)
An one dimensional atmosphere-canopy-soil interaction model is developed to estimate of the heat budget parameter in the atmospheric boundary layer. The canopy model is composed of the three balance equations of energy, temperature, moisture at ground surface and canopy layer with three independent variables of T_f(foliage temperature), T_g(ground temperature), and q_g(ground specific humidity). The model was verified by comparative study with OSUID(Oregon State University One Dimensional Model) proved in HAPEX-MOBILHY experiment. Also we applied this model in two dimensional land-sea breeze circulation.
According to the results of this study, surface characteristics considering canopy acted importantly upon the simulation of meso-scale circulation. The factors which used in the numerical experiment are as follows ; the change for a sort of soll(sand and peat), the change for shielding factor, and the change for a kind of vegetation.
6.
1996.12
서비스 종료(열람 제한)
This study was carried out to investigate the chemical characteristics of rainwater sampled in Cheju City from July 1994 to June 1996. Concentrations of major Ions (Cl^-, SO_4^2-,NO_3^-, Na^+, K^+, Ca^2+, Mg^2+ and NH_4^+) were determined. The pH of rainwater, calculated from the volume weighted H^+ concentration, was found to be 5.61, indicating extensive neutralization of the acidity in the rain. The relative magnitude of average ionic concentrations followed the relation Cl^-> SO_4^2-> Na^+> Ca^2+> NH_4^+> NO_3^-> Mg^2+> K^+. The ions associated with sea salt, namely Na^+ and Cl^-, dominated the total concentration of ions in the rainwater and the SO_4^2- ion accounts for 20% of total concentration. [H^+]/[nss-SO_4^2-+NO_3] ratio and a multiple regression for SO_4^2- and NO_3^- ions against H^+, Ca^2+ and NH_4^suggested that all of SO_4^2+ and NO_3^- in rainwater was not necessarily associated with H_2SO_4, anf HNO_3, but might also occur in combination with NH_4^+ or Ca^2+. The monthly mean concentrations of SO_4^2-, Ca^2+ and NH_4^+ in spring time was higher than those in other seasons. These results may be attributed to the fertilizer application as the local sources and the yellow sand phenomina as a regional-scale sources.
7.
1996.12
서비스 종료(열람 제한)
In order to grasp a characterization of low boiling point chlorinated organic compounds, this study which were carried out at the 8 stations for precipitation samples in the Pusan area during the period from February to September 1995.
As a result, low boiling chlorinated organic compounds were estimated that it was dissolved by a portion of precipitation, and it be able to shift at the surface of the each.
Concentration of low boiling point chlorinated organic compounds in precipitation are increased with increase of temperature, and estimated that air pollution compounds of as a rule in atmosphere.
8.
1996.12
서비스 종료(열람 제한)
The removal effectiveness of various heavy metal ions in boron-rich containing plants has been studied by means of spectroscopic and pH methods. Treatment of the boron-rich containing sample which was collected from cherry and root of cabbage to heavy metal ions is resulted in that an excellent removal effect shows in the case of large ionic size of heavy metal. Stability constants are depended on the variation of pH.
9.
1996.12
서비스 종료(열람 제한)
This study was performed to analyze the variation characteristics of water qulity, correlation analysis of water quality data at each site and among the items of water quality data. Water quality for analysis was monthly values of water temperature, pH, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, suspended solid, T-N and T-P checked in Daecheong Lake from January to December, 1995.
It was analyzed variation of monthly water qulity was well from February to April, water temperature and COD seemed to have high correlationships at all sites. Regression equation is COD = 0.07 Water temperature + 1.23 (R^2 = 0.7616) . Results of the correlation analysis of water quality data showed that DO had higt correlationships between site 1 and site 2, BOD did site 1 and 3, COD did site 1 and 2, SS did site 5 and 6, T-N did 2 and 3, T-P did site 4 and 6. Regression equations for estimate of water quality data are as follows.
DO_1 = 4.46 + 0.59 DO_2 (R^2 = 0.8868), BOD_1 = 0.52 + 0.63 BOD_3 (R^2 = 0.6390)
COD_2 = 0.44 + 0.71 COD_1 (R^2 = 0.9183), SS_6 = 0.89 + 0.70 SS_5 (R^2 = 0.9155)
TN_3 = 0.151 + 0.886 TN_2 (R^2 = 0.9415), TP_4 = 0.004 + 0.758 TP_6 (R^2 = 0.9669)
10.
1996.12
서비스 종료(열람 제한)
The sediment in the highly contaminated Gamjeon brook was collected, mixed with the raw material of the tile, and then the commercial tile was produced using the mixture. The concentrations of the heavy metals in the mixture-before and after the tile was produced-were analyzed and the effects of the acid solution on the produced file were examined.
The production of the tiles was successful and the result of heavy metal analysis showed that the concentration of Fe was the highest and that of Cd was the lowest The amount of heavy metal in the sediment - the raw material of the tile mixture was more than that of the produced tile. The elution concentration of the heavy metal by the acid solution(pH = 4 - 7) was low and the quality of the produced tile was better than the commercial tile. The result of this study suggested that the contaminated sediment was removed to produce good tiles, therefore the water pollution and soil pollution were reduced.
11.
1996.12
서비스 종료(열람 제한)
Cation exchange distribution coefficients of poly(dithiocarbamate) were presented for Cd^2+, Cr^3+, and Pb^2+ in HCl. The distribution coefficients were determined by using the batch method. Based on these distribution data, the separation possibilities of the heavy metal ions were discussed.
The distribution coefficients of three heavy metal ions on dithiocarbamate resin were decreased as HCl concentrations were increased. The selective separation of Cr^3+ and Cd^2+ was possible by using 0.1 M HCl in dithiocarbamate resin and the reproducibility test showed that the average absorptivity of resin was 90% in the case of Cd^2+ ion by the column method.
12.
1996.12
서비스 종료(열람 제한)
The incineration tests of mixed industrial wastes using the stoker type incinerator are carried out to investigate the partitioning characteristics of heavy metals during incineration. The results obtained from this study are as follow.
The partitioning characteristics of heavy metals throughout this incinerator are found that, at given condition of 700℃, the elements with the relatively high boiling point such as Cr, Cu and Pb are partitioned into a bottom ash, a fly ash captured by cyclone, and a flue gas stream, 67∼88%, 2∼19% and 6∼16% of initial amount entering the incinerator, respectively, but the Cd and Hg of 75∼81% is vaporized into the flue gas. It appears that the partitioning characteristics according to the particle size of ash is different between the bottom ash and the fly ash. For bottom ash, the fraction of partitioning into 75㎛ oversized particles is relatively high. For fly ash, the characteristics of distributions with the particle size can not be clearly shown.
13.
1996.12
서비스 종료(열람 제한)
We investigated concentrations of heavy metals(Cr, Cd, Zn, Fe, Pb, Cu, and Mn) and correlations between concentrations of heavy metals in the sediment, soil, weeds, and vegetables on the lower Nakdong river. Concentrations of heavy metals on the lower Milyang river was generally lower than those of other sampling area. In the soil, concentration of Pb is generally larger than that of other heavy metals. Generally, concentrations of heavy metals in the sediment show decreasing tendency as the sampling area moves toward downstream of the river, but those of in the soil and weeds show increasing tendency. There is no significant correlation between concentration of heavy metals in the soil-sediment, soil-vegetables, sediment-weeds, or vegetables-weeds. Only concentrations of Pb in the vegetables and those of in the weeds show very high correlation.
14.
1996.12
서비스 종료(열람 제한)
The toxic effects of aluminium (Al) on growth, chlorophyll content, δ-aminolevulinic acid dehydratase (ALAD) activity and anatomy of root and shoot were investigated in 7-day-old azuki bean (Vigna angularis) seedlings. Significant depressions in root elongation was observed in the low concentrations of Al (50, 100 ㎛) and increasing Al concentrations caused a sharp decline of root and shoot growth. The degree of inhibition was dependent upon Al supply. Exposure to 50 ㎛ Al or more inhibited root elongation within 1 day. In the 50 ㎛ Al treatments, a recovery of root growth was seen after 7 days exposure. In contrast, lateral root initials was little affected by Al exposure. Al toxicity symptoms and growth responses were more well developed in the roots than in the shoots. Analysis of Al localization in root cells by hematoxylin staining showed that Al entered root apices and accumulated in the epidermal and cortical cells immeadiately below the epidermis. There was a good positive correlation between the level of chlorophyll and ALAD activity. Increasing Al concentrations caused a decrease in total chlorophyll contents, accompanied by proportional changes in ALAD activity, suggesting a coordinated reduction of a photosynthetic machinery. Al exerted specific influence on the morphology of root and shoot. At higher concentrations of Al the roots induced drastic anatomical changes. The epidermal cells were disorganized or destructed while the cortical cells exhibited distortion of cell shape and/or disintegration. The diameter of root and transectional area of cortical cells decreased considerably with Al treatment. In the shoot Al also enhanced reduction of diameter of shoot and cell size. Gross anatomy of leaves treated with Al did not differ significantly from the controls, except for fewer and smaller chloroplast. Our results indicate that toxic effect of Al appear to be manifested primarily in roots and secondarily on shoots, and changes in root morphology are related to changes in the root growth patterns. Results are further discussed in relation to the findings in other plant species, and it is concluded that Al causes morphological, structural and, presumably, functional damage to the roots of the species investigated.
