釜山市 地下商街와 그 地上空氣中 呼吸性 粉塵 및 重金屬 濃度에 관한 比較 硏究

한돈희 인제대학교 1991 仁濟論叢 Vol.7 No.1

This study was performed to analyse the differences of suspended particulates, heavy metals between aboveground and underground at 3 underground-markets, and to assist in controling the indoor air pollution at underground-markets in Pusan. Air sampling was fulfilled at 12 points(6 points aboveground, 6 points underground) from December 11 to 22 in 1990. The results are as follows ; 1. The aboveground levels of total suspended particulates(TSP) and respirable dust were revealed higher than underground, and all were very severe. 2. On the whole, the level of respirable dust was increased in proportion to the level of TSP and the proportions of respirable dust to TSP were 72% aboveground, 78% underground. 3. In general, the levels of heavy metals were not severe.

양질의 방진마스크용 필터 개발을 위한 방향제시

한돈희 인제대학교 1999 仁濟論叢 Vol.14 No.3

Most of manufacturers try to produce the most efficient filter for respirators with the lowest breathing resistance. Filter performance depends on the low penetration, i.e., the high efficiency (%), and pressure drop (mmH2O). This study was performed to suggest the direction for development of good performance of mechanical filters for respirators and filtering facepieces. Two mechanical filters, S and K made in Korea, three filtering facepieces, S made in China, C made in Korea and M made in USA, which were widely used in the workplace were selected and tested efficiency and pressure drop in accordance with flow rate, using with Automated Filter Tester Model 8110 (TSI, USA). It was necessary for mechanical filter S to lower pressure drop without increasing efficiency, but mechanical filter K should be increased efficiency and decreased pressure drop. While filtering facepiece M had the best quality performance of three ones, S and C should get much higher efficiency and lower pressure for better performance.

김해시 영세유기용제 취급사업장의 환기시설 점검과 개선방안

한돈희 인제대학교 김해발전연구소 1997 김해발전연구 Vol.1 No.2

石灰, Fly Ash 및 볏짚재가 土壤에서 무우로 移行 蓄積되는 카드뮴과 납의 含量 減少에 미치는 影響

韓敦熙 인제대학교 1992 仁濟論叢 Vol.8 No.2

Greenhouse pot experiments were conducted to evaluate the effects of lime, fly ash and ash(from rice straw) on the cadmium and lead translocation from soil to radish. The soils with low metal contents(Cd 1.52 ppm and Pb 25.37ppm) were prepared and high metal contents (Cd 8.99 ppm and Pb 50.81ppm) were prepared and amended with 0.25%, 0.5%, 1.0%, 2.0% each of lime, fly ash and ash. Radishes(Raphanus sativus) were cultivated and cropped on the soils during 25, 50 and 75 days after sprout, and then cadmium and lead contents of radishes were analyzed by roots and tops. The results obtained are as follows. 1. Lime and ash were effective in raising the soil pH, but fly ash was not effective. 2. The growth of radishes were not impaired by the cadmium and lead contamination but, impaired by soil pH 7.5 or more. 3. Cadmium was accumulated very strongly in radishes and the greater concentration was found in tops than roots, but lead showed no evidence of accumulation in radishes. 4. In general, when the concentrations of lime and ash in soils increased, the uptake of cadmium and lead by radishes decreased, and lime was more effective than ash, while fly ash revealed no effect of reducing the translocation of cadmium and lead from soils to radishes. 5. The uptake of cadmium by radishes decreased more effectively than lead and the uptake of Cd or Pb by radishes grown in the soils with high metal contents decreased more effectively than low metal con tents. 6. Cadmium and lead contents of radishes were negatively correlated with soil pH values and the relationship in cadmium content was stronger than that in lead content. KEY WORDS : Cadmium, Lead, Translocation, Reduction, Lime, Fly Ash, Ash, Radish

가스흡착력의 원리에 의한 CS₂의 활성탄관 파과현상에 미치는 시료채취속도의 영향

李鎭憲,洪仁錫,韓敦熙 인제대학교 1994 仁濟論叢 Vol.10 No.2

The purpose of this study was to determined the effects of flow rates on breakthrough in charcoal tubes. Firstly the charcoal tubes were contaminated with CS2, and then the effects of them were examinated by using the principle of Gas Adsorption Kinetics. The results obtained were as follows. 1) As the flow rates were increased, k'-values were increased, τ-values were decreased, and k'-values were constant as 3.527±0.558. 2) 10% breakthrough times of 0.05, 0.1 and 0.2LPM were 149, 90 and 34 min, respectively. 3) As the probability of breakthrough were increased, the effects of sampling flow rate against the breakthrough time were proportionally increased.

Part one: Research in Korea : Evaluation of Particulate Filtering Respirators Using Inward Leakage Testing in Korea

( Don Hee Han ),( Hee Sook Kang ),( Young Sik Kim ),( Jang Hoon Seo ) 한국환경보건학회(구-한국환경위생학회) 2004 Current Challenges and Advances in Environmental H Vol.- No.-

Determination of Parathion Metabolite, p-Nitrophenol in Urine of Parathion Factory Workers

Han, Don-Hee,Jung, Dong-Gyun,Shin, Ho-Sang Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5

Parathion is an organophosphate pesticide being legally applied for the purpose of agriculture and is being manufactured in Korea. A gas chromatography/mass spectrometric method was developed for the determination of parathion urinary metabolite, p-nitrophenol. p-Nitrophenol was extracted from weak acidic urine, and then measured by gas chromatography-mass spectrometry (selected ion monitoring). The recovery of pnitrophenol in the overall procedure was 88.2%. The detection limit of the assay was 1.0 $\mu$ g/L based upon assayed urine of 2.0 mL. The method was applied to the determination of p-nitrophenol in urine of workers of a parathion industry. Spot urines of workers of a parathion industry were sampled at the end of shift and pnitrophenol was analyzed using above developed method. p-Nitrophenol could be detected in all of the urine samples at concentrations varying from 3.0 to 681 $\mu$ g/L.

화학공장 인근 주민의 개인보호장구 지급에 관한 경제성 분석

한돈희(Don-Hee Han),장영재(Young-Jae Chang),박민수(Min Soo Park) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.5

Objectives: To protect the health and safety of residents during chemical accidents, the governmental authorities need to provide personal protective equipment (PPE) to citizens who desire it. This study aims to investigate residents’awareness of PPE and perform an economic analysis on providing PPE to residents near chemical plants prior to the establishment of a related law. Methods: This study was carried out through a questionnaire completed by 600 residents composed of items such as residents’awareness of PPE, what type of PPE they need, and how to purchase PPE. Economic analysis (cost-benefit analysis) was conducted on providing PPE to residents near chemical plants on basis of the Gumi City hydrogen fluoride accident of 2012. Results: The results of the questionnaire showed that most residents recognized the need for PPE preparedness for chemical accidents, in particular, for respirators. The level of expense that respondents were prepared to shoulder to share the burden was $25. Except for chemicals of hazard level 2, the benefit of all kinds of chemical accident preparedness considerably exceeded costs in the cost-benefit analysis on providing PPE. An estimated government budget of $20 million per year would be required to provide PPE (hood-type mask) for all residents within a one-kilometer radius of chemical plants in Korea, but only $5.8 million when residents share the expenses. Conclusion: The results of this study suggest that programs for providing PPE for residents near chemical plants should be established by law.

물의 경도가 흰쥐의 신장, 간에서 중금속 축적에 미치는 영향

한돈희(Don Hee Han) 한국환경보건학회 1988 한국환경보건학회지 Vol.14 No.2

It has been suggested that calcium is on1y one of many metals that compete with toxic metals in the body. Therefore, this study was carried out to determine the influence of water hardness on accumulation of heavy metals in rats. The seventy-five rats were divided into control and case groups. Case group was subdivided into four subgroups in proportiOll to the concentration of water hardness respectively, such as, 0, 250, 500, 1000ppm. Control group was fed on only deionized water, but case groups were fed on hard water with ionized heavy metals (Cd 150mg + Pb 300mg + Cu 300mg/l) for 20, 40, 60 days. The concentrations of cadmium, lead and copper were measured by atomic absorption spectrophotometry (perkin Elmer 2380) in livers and kidneys. πle results of the study are summarized as followíng; 1. The concentration of cadmium accumu1ation showed the tendency of decrease in proportion to water hardness in both livers and kidneys of rats having been fed for only 60 days, respectívely. 2. In only livers of rats having been fed for 60 days, essentíal metal, copper had the tendency of decrease according as hardness ín water. 3. 1t was impossible to compare case wíth control about the tendency of lead accumulatíon because there was no difference between the two in livers and kidneys respectively.

검정실험 TIL(누설률)에 의한 방진마스크의 평가와 TIL의 적합성에 관한 연구

한돈희 ( Don Hee Han ),우상식 ( Sang Sik Woo ),정회명 ( Hoi Myung Jung ) 한국산업위생학회 2004 한국산업보건학회지 Vol.14 No.3

Korean certification regulation for particulate respirator requires total inward leakage (TIL) test as European Standards (EN) and the standard levels of regulation are the same as those of EN. This study was conducted to evaluate particulate respirator being commercially used in the market by TIL and to evaluate validity of the certification test in Korea. Two full face masks, three half masks and 10 filtering facepieces (two top-class, four 1st-class and four 2nd-class), total 15 brands respirators, and 10 test panels (subjects) who were classified in 9 facial grids in accordance with face length and lip length, were selected for test. TIL tests were conducted in the laboratory of 3M Innovation Center which was established by EN standard. As expected TILs of full face masks were the lowest in three types and TILs of half masks and filtering facepieces showed statistically significant difference in manufacturers. It was found that TIL test methodology used in this study seemed to be the lack of sensitivity for full face masks. TILs of 1st class filtering facepieces were found to be much more than those of 2nd class and thus the result would cause a wearer to get confused when selecting a mask. Main causes of leakage for filtering facepieces may be not filter media, but faceseal leakage since minimal TILs of individual arithmetic averages were so much lower that standard levels. Therefore it is necessary to develop well-fitting filtering facepieces for Korean. Because TILs were significantly different among facial dimensions, test panel for TIL test should be developed and certification regulations may be thought to be revised.