Ham, Seung hon;Hwang, Sung Ho;Yoon, Chungsik;Park, Donguk
Journal of Korean Society of Occupational and Environmental Hygiene
/
v.19
no.3
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pp.213-232
/
2009
This document was prepared to review and summarize the analytical methods for airborne and bulk asbestos. Basic principles, shortcomings and advantages for asbestos analytical instruments using phase contrast microscopy(PCM), polarized light microscopy(PLM), X-ray diffractometer (XRD), transmission electron microscopy(TEM), scanning electron microscopy(SEM) were reviewed. Both PCM and PLM are principal instrument for airborne and bulk asbestos analysis, respectively. If needed, analytical electron microscopy is employed to confirm asbestos identification. PCM is used originally for workplace airborne asbestos fiber and its application has been expanded to measure airborne fiber. Shortcoming of PCM is that it cannot differentiate true asbestos from non asbestos fiber form and its low resolution limit ($0.2{\sim}0.25{\mu}m$). The measurement of airborne asbestos fiber can be performed by EPA's Asbestos Hazard Emergency Response Act (AHERA) method, World Health Organization (WHO) method, International Standard Organization (ISO) 10312 method, Japan's Environmental Asbestos Monitoring method, and Standard method of Indoor Air Quality of Korea. The measurement of airborne asbestos fiber in workplace can be performed by National Institute for Occupational Safety and Health (NIOSH) 7400 method, NIOSH 7402 method, Occupational Safety and Health Administration (OSHA) ID-160 method, UK's Health and Safety Executive(HSE) Methods for the determination of hazardous substances (MDHS) 39/4 method and Korea Occupational Safety and Health Agency (KOSHA) CODE-A-1-2004 method of Korea. To analyze the bulk asbestos, stereo microscope (SM) and PLM is required by EPA -600/R-93/116 method. Most bulk asbestos can be identified by SM and PLM but one limitation of PLM is that it can not see very thin fiber (i.e., < $0.25{\mu}m$). Bulk asbestos analytical methods, including EPA-600/M4-82-020, EPA-600/R-93/116, OSHA ID-191, Laboratory approval program of New York were reviewed. Also, analytical methods for asbestos in soil, dust, water were briefly discussed. Analytical electron microscope, a transmission electron microscope equipped with selected area electron diffraction (SAED) and energy dispersive X-ray analyser(EDXA), has been known to be better to identify asbestiform than scanning electron microscope(SEM). Though there is no standard SEM procedures, SEM is known to be more suitable to analyze long, thin fiber and more cost-effective. Field emission scanning electron microscope (FE-SEM) imaging protocol was developed to identify asbestos fiber. Although many asbestos analytical methods are available, there is no method that can be applied to all type of samples. In order to detect asbestos with confidence, all advantages and disadvantages of each instrument and method for given sample should be considered.
The porosity formation by the addition of additives was found to be the highest in the case of aluminum powder 3% and $Ca(OH)_2$ 2% under the condition that strength was maintained. The optimum mixing ratio of the binder was shown to be the most effective at (Ash+Food waste+clay):(water glass+colloidal silica) 7:3, and the temperature response is most economical and effective at $1,000^{\circ}C$. The optimal mixing ratio is the strength in 30% of ash, 30% of clay and 10% of food waste, which is the effective in non-point pollution water treatment. Filter media produced under optimal mixing conditions were analyzed as $SiO_2$ 65.8%, density $1.4g/cm^3$, porosity 25.6%, pH 9.8, and no hazardous substances were detected. As a result of the filtration of the water treatment, the mean concentration of the filtered SS was $14.06mg/{\ell}$, and the removal efficiency of SS was 90%, the recovery rate of the reversal is 97.1%. This enables the development of filter media considering economic efficiency and efficiency as well as the utilization of waste resources, enabling high value added of waste resources.
Kim, Hyun-Sub;Jeon, Byeong-Han;Lee, Myeong-Ji;Yun, Jeong-Hyeon;Lee, Hyun-Seung;Jung, Woong-Yul;Jo, Jeong-A
Journal of the Korea Academia-Industrial cooperation Society
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v.21
no.10
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pp.308-316
/
2020
This study attempted to derive an equation for calculating the damage impact distance using CARIS so that local governments can quickly determine evacuation and notification of residents in the event of an ammonia-release accident. Ammonia is an accident-causing substance and one of 16 substances to prepare for resident evacuation. It is the most frequently occurring chemical with 58 chemical accidents from 2014~2019. The study derives an equation for calculating the damage impact distance according to the exposure time of ammonia based on AEGL, an acute exposure standard applicable to the general population, which is includes vulnerable groups such as infants, children and the elderly and designated by the EPA. The calculation formulas for each concentration and exposure time to classify the hazardous area according to AEGL-3 and the semi-dangerous area according to AEGL-2 were derived. A comparison of the relative standard deviation between the damage impact distance values of CARIS revealed that is was in the range of 0~2%. Local governments should consider the actual accident situation and apply the appropriate damage-affected distance calculation formula derived from the study to evacuate residents near the origin of the accident or use for protective measures such as indoor evacuation notification.
Kim, Seong-Ah;Shin, Sangah;Lee, Jung Won;Joung, Hyojee
Journal of Nutrition and Health
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v.47
no.5
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pp.364-373
/
2014
Purpose: The purpose of this study was to develop a mercury database for food commonly consumed by Koreans. Methods: Target foods for a mercury database were selected from dietary survey data of the 2007-2009 Korean National Health and Nutrition Examination Survey (KNHANES). Data for mercury contents of foods were collected through literature review. Among 702 food items reported by 24 hr dietary recall method, the contents of mercury for 300 food items were selected with systematic evaluation from the literature, which provided analytical values, and those of 56 food items were imputed by using a conversion factor. Results: The mercury database developed in this study covered 50.7% of all kinds of consumed foods and 95.1% of total amount of food intake reported by 2007-2009 KNHANES. In the database, the geometric mean of mercury contents in food items was the highest in the fishes and shellfishes group ($41.13{\mu}g/kg$, n = 101) followed by mushrooms ($18.93{\mu}g/kg$, n = 12) and seaweeds ($5.92{\mu}g/kg$, n = 14), and the lowest in the meats group ($0.15{\mu}g/kg$, n = 17). Conclusion: The developed mercury database can be used to estimate the dietary mercury exposure of Korean people, and the method for development of a mercury database would be helpful to researchers in development of a new database for other food borne hazardous substances.
Seo, Chang-Seob;Huang, Dae-Sun;Lee, Jun-Kyoung;Ha, Hye-Kyoung;Chun, Jin-Mi;Um, Young-Ran;Jang, Seol;Shin, Hyeun-Kyoo
Herbal Formula Science
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v.17
no.2
/
pp.53-63
/
2009
Objective : To compare the contents of heavy metals, residual pesticides and sulfur dioxide before/after a decoction. Methods : The heavy metal contents before/after a decoction were measured by Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES) and mercury analyzer. In order to analyze pesticides in 4 samples we used simultaneous multi-residue analysis of pesticides by GC/ECD, which was followed by GC/MSD analysis to confirm the identity of the detected pesticide in each sample. In addition, the contents of sulfur dioxide ($SO_2$) were performed by Monier-Williams distillation method. Results: 1. The mean values of heavy metal contents (mg/kg) for the samples were as follows: Jaeumganghwa-tang (before decoction - Pb; 1.190, Cd; 0.184, As; 0.099 and Hg; 0.028, after decoction - Pb; .033, Cd; 0.003, As; 0.005 and Hg; 0.001), Yukmijiwhang-tang (before decoction - Pb; 0.484, Cd; 0.133, As; 0.053 and Hg; 0.009, after decoction - Pb; 0.065, Cd; 0.008, As; 0.007 and Hg; not detected), Bojungikgi-tang (before decoction - Pb; 0.863, Cd; 0.197, As; below 0.016 and Hg; 0.011, after decoction - Pb; 0.071, Cd; 0.009, As; 0.004 and Hg; 0.001) and Ssangwha-tang (before decoction - Pb; 1.511, Cd; 0.212, As; 0.094 and Hg; 0.016, after decoction - Pb; 0.029, Cd; 0.006, As; 0.005 and Hg; 0.0004). 2. Contents (mg/kg) of sulfur dioxide ($SO_2$) before a decoction in Jaeumganghwa-tang, Yukmijiwhang-tang and Ssangwha-tang exhibited 22.7, 107.3 and 5.5, respectively. However, contents of sulfur dioxide after a decoction in all samples were not detected. 3. Contents (mg/kg) of residual pesticides before/after a decoction in all samples were not detected. Conclusion : These results will be used to establish a criterion of heavy metals, residual pesticides and sulfur dioxide.
Park, You-Jin;Lee, Seul-Ji;Yoon, Ji-Yeon;Myoung, Sung-Min
The Journal of Pediatrics of Korean Medicine
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v.25
no.1
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pp.90-110
/
2011
Objectives: The purpose of this study is to examine the parental recognition and utilizing patterns of oriental medical care in children who live in Seong-Dong district. Methods 802 day-care center children's parents participated in the survey on recognition and utilizing patterns of oriental medical care, and 702 of the surveys were analyzed. Results: 1. 38.33% has received previous oriental medical treatments and most were received at the children's age under 12-24 months. Majority of the treatments took place in the clinical settings. By recommendation, some also received their treatment at the medical centers. One of the reasons why they receive oriental medical treatments was that they prefer to balance their treatment with the orental medical treatments along with the western's. 2. 53.85% of those who received oriental medical treatments were satisfied with their treatments. The effective treatment results were the major reason for the satisfaction. 3. 49.56% of those who had oriental medical treatments chose specific oriental medical facilities for the children's ailment. Most specific oriental medical facilities were local oriental medical clinics. Reputation fame were the main reason in choosing the clinics. 4. In 2009, 55.26% had received care in the specific oriental medical clinics for the diseases, such as respiratory symptoms, systemic symptoms, gastrointestinal symptoms, skin problems, neurological and psychiatric disease for infants, and respiratory symptoms, gastrointestinal symptoms, systemic symptoms, skin problems, neurological and psychiatric symptoms, urinary symptoms and musculoskeletal symptoms for toddlers. 5. The average duration of herbal treatment were 7-14 days, preferably 4-6 days, and preferred number of medical visits were once a week on Saturdays and preferred day for night cares were on Friday nights. Average treatment fee per treatment was less than 10,000 won which coincided with the preferred treatment fee per visit. 6. The very first medical institutions chosen by parents once their children are ill are the following; Western medical institutions, western medical clinics, pharmacies, oriental medical clinics, health centers, and lastly, oriental medical institutions. The major concerns in receiving oriental medical cares include pesticides in herbs and hazardous substances in heavy metals. Preferred form of oriental medicine was decoction, the negative feedback of oriental medicine was mostly due to the bitter taste of the oriental herbal decoctions. Preferred frequency of intake was twice a day with less than 10cc~20cc per single intake. Conclusions: Taken all together, we conclude that the growing recognition of Oriental Pediatric medicine is needed among parents.
A nation-wide monitoring survey was performed to look into pesticide use pattern and amount on farmers' field after the national registration of pesticides from 2003 to 2004. Tow hundred ninety two leading farmers involved in the survey were chosen from main cultivating regions of targeted crops in consideration with area. Most farmers involved in the survey follow the safe use guideline of pesticides, while their information to select and making-decision for purchasing pesticides were done according to the recommendation of mainly pesticide market dealers or agricultural cooperative dealers. Used amount of pesticide per unit cropping area was surveyed as 5.51 on paddy, 3.91 on field cabbage, 2.93 on greenhouse cabbage, 0.76 on lettuce, 0.55 on spinach, 1.34 on perilla leaf, 4.89 on leek and 0.42 kg $ha^{-1}$ on young radish. As compound with those surveyed from 1999 to 2000, the pesticide amounts used for rice, lettuce and perilla leaf were reduced while that for cabbage was increased.
Kim, Byung-Seok;Park, Yoen-Ki;Park, Kyung-Hun;Shin, Jin-Sup;Kim, Jin-Hwa;Yoon, Seong-Myeong;Ahn, Young-Joon
The Korean Journal of Pesticide Science
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v.10
no.3
/
pp.196-200
/
2006
In this study we investigated fecundity and survivorship of four staple Korean freshwater cladocerans for their whole life to develop a new standard method used for ecological risk assessment of pesticide. The tested Korean freshwater cladocerans were Daphnia obtusa, Daphnia sp., Moina macrocopa and Simocephalus vetulus. In addition, standard test species, Daphnia magna endorsed formally by the major international organizations was tested together in order to compare with the reproductive characteristics of Korean cladocerans. A total of 358 young was produced by D. magna, whereas, 297 young was reduced by Daphnia sp. throughout the entire life. The average life span of Daphnia magna was 50 days much longer than any other Korean species. Nevertheless all of the Korean water flea tested showed good fecundity, produced over 60 young for 21 days as the validation criterion for reproduction toxicity test in Ecological Effects Test Guidelines published by USEPA. Especially Moina macrocopa produced their first brood in 4 days. Therefore 10 day reproduction test with Moina macrocopa may be an alternative good method to save cost and time to elucidating the effects of hazardous substances on the reproduction of aquatic invertebrates.
Kim, Myungjin;Bae, Heekyung;Choi, Yeonki;Kim, Mi Kyoung;Koo, Hyun-Ju;Song, Sang-Hwan;Choi, Kwang-Soo
Journal of Environmental Impact Assessment
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v.14
no.5
/
pp.347-353
/
2005
The risk assessment is the qualitative or quantitative evaluation of the risk posed to human health and the environment by the actual or potential presence or release of hazardous substances, pollutants or contaminants. The environmental impact assessment (EIA) is assessed by the environmental criteria, and risk assessment is assessed by the risk rate. Risk rate based on dose-response values may not be easy to apply on regulatory basis like EIA for uncertainty. Internationally there is an example of OECD program. Risk assessment of High Production Volume (HPV) Chemicals has started since the OECD Program with the 1990 Council Act on the Co-operative Investigation and Risk Reduction of Existing Chemicals. These HPV chemicals include all chemicals produced or imported at levels greater than 1,000 tonnes per year in at least one Member country or in the European Union region. The SIDS called the Screening Information Data Set is regarded as the minimum information needed to assess an HPV chemical to determine whether any further work should be carried out or not. All the data elements of SIDS including assessment for environment and health are prepared as three formats of the full SIDS Dossier, the SIDS Initial Assessment Report (SIAR), and the SIDS Initial Assessment Profile (SIAP) of an HPV chemical. In 1998 the global chemical industry through the International Council of Chemical Associations (ICCA) has joined to work with OECD. The OECD has assessed approximately 1,000 chemicals from 1991 through 2004 with ICCA. Till the February of 2005, 592 chemicals of those chemicals completed SIDS reports. Member countries have been targeted the goal of 1,000 new chemicals from 2005 to 2010 and Korea shared 36 chemicals from the 1,000 new chemicals. Currently Korea has completed SIDS reports of 7 chemicals among sponsored 24 chemicals. In conclusion SIDS project will be linked to national program for outputs application with more reliable production. Both the OECD and industry will carry out their commitment to complete assessments for more and the remaining chemicals assessment. The major outputs will contribute to cope with international chemical management.
Journal of Korean Society of Occupational and Environmental Hygiene
/
v.27
no.3
/
pp.187-192
/
2017
Objectives: It is difficult to identify exposure factors in the semiconductor industry due to low exposure levels to hazardous substances and because various processes take place in fabrication (FAB). Furthermore, a single worker often experiences a variety of job histories, so it is difficult to classify similar exposure groups (SEG) in the semiconductor industry. Therefore, we intend to develop a new exposure index, the period of working in FAB, that is applicable to the semiconductor industry. Methods: First, in specifying the classification of jobs, we clearly distinguished whether they were FAB workers or non-FAB workers. We checked FAB working hours per week through questionnaires administered to FAB workers. We derived an exposure index called FAB-Year that can represent the period of working in FAB. FAB-Year is an index that can quantitatively indicate the period of working in FAB, and one FAB-Year is defined as working in FAB for 40 hours per week for one year. Results: A total of 8,453 persons were surveyed, and male engineers and female operators occupied 90% of the total. The average total years of service of the subjects was 9.7 years, and the average FAB-Year value was 6.8. This means that the FAB-working ratio occupies 70% of total years of service. The average FAB-Year value for female operators was 8.4, for male facility engineers it was 7.7, and for male process engineers it was 3.5. A FAB-Year standardization value according to personal information (gender, job group, entry year, retirement year) for the survey subjects can be calculated, and standardized estimation values can be applied to workers who are not participating in the survey, such as retirees and workers on a leave of absence (LOA). Conclusions: This study suggests an alternative method for overcoming the limitations on epidemiological study of the semiconductor industry where it is difficult to classify exposure groups by developing a new exposure index called FAB-Year. Since FAB-Year is a quantitative index, we expect that various approaches will be possible in future epidemiological studies.
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