지시약의 등흡광점을 이용한 용액의 pH측정(제2보)

최원형,박민수,허호장 경성대학교 1989 論文集 Vol.10 No.1

지시약 Bromo Cresol Green(BCG) 용액을 시료 용액에 첨가하고 지시약의 염기성 최대 흡수 파장과 등흡광점에서 이 시료액의 흡광도를 측정하였다. 이들 측정한 흡광도로부터 용액의 pH를 계산하였다. 등흡광점에서 흡광도의 범위를 0.1내지 0.17로 유지하고 시료 용액의 pH가 pK₁±1내에서, pH측정 오차는 ±0.07pH 단위 이내이었다. The Bromo cresol Green (BCG) stock solution was added to Sample solution and the absorbance of this solution was measured at the maximum absorption wavelength of basic form and the isosbertic point of the indicator. From these measurements of absorbance, the pH of this solution was calculated. The range of absorbance at the isobestic point was maintained with in 0.1∼0.17. The errorof pH measurement was within ±0.07pH unit in the pH range sample solution of pK₁±1

지시약의 등흡광점을 이용한 용액의 pH 측정

최원형,허호장,Won-Hyung Choi,Ho-Jang Hur 대한화학회 1989 대한화학회지 Vol.33 No.2

지시약 메틸레드 용액을 시료용액에 첨가하고 지시약의 산형의 최대흡수파장과 염기형의 최대 흡수파장 및 등흡광점에서 이 시료액 흡광도를 측정하였다. 이를 측정한 흡광도로부터 이 용액의 pH를 계산하였다. 등흡광점에서 흡광도 범위를 0.1내지 0.3으로 유지하고 시료용액의 pH가 $pK_I{\pm}1$내에서, pH측정오차는 ${\pm}$0.08pH 단위 이내이었다. The methyl red stock solution was added to sample solution and the absorbance values of this solution were measured at the maximum absorption wavelengths of the acidic form, the basic form, and the isosbestic point of the indicator. From the measurements of absorbance, the pH of this solution was calculated. The range of absorbance at the isosbestic point was maintained within 0.1 ${\sim}$ 0.3. The error of pH measurement was within ${\pm}0.08$ pH unit in the pH range of sample solution of $pK_I{\pm}1$.

허베이스피릿호 유류유출사고 방제작업에 참여한 주민의 정신건강

송민교,홍윤철,정해관,하미나,권호장,하은희,최예용,정우철,허종일,이승민,김은정,Song, Min-Kyo,Hong, Yun-Chul,Cheong, Hae-Kwan,Ha, Mi-Na,Kwon, Ho-Jang,Ha, Eun-Hee,Choi, Ye-Yong,Jeong, Woo-Chul,Hur, Jong-Il,Lee, Seung-Min,Kim, Eun-Jung 대한예방의학회 2009 예방의학회지 Vol.42 No.2

Objectives : Our objective was to examine and evaluate the psychological health of the residents of Taean during the cleanup of the Hebei Spirit(HS) oil spill and to review some factors associated with the results. Methods : A community survey of 71 men and women was conducted 8 weeks after the HS oil spill. Questionnaires used were the PWI(Psychological Well-being Index) scale for psychosocial distress, the CES-D(Center for Epidemiologic Studies-Depression) scale for depressive symptoms, and a questionnaire created to assess suicidal impulses. Results : The overall prevalence of high-risk psychosocial distress among the study group was 64.2%. The percentages of respondents with scores on the CES-D Scale above 16 and above 21 were 77.6% and 62.7%, respectively. The percentage of respondents categorized as having suicidal impulses was 18.3%. When compared with unexposed groups in the general population taken from various sources, the residents of Taean were 6.5 times as likely to have high stress and 9.4-9.7 times as likely to be depressed. No significant difference in the rate of suicidal impulse was found between the residents of Taean and the general population. Factors associated with high stress, depression, and suicidal impulses were age, a change in income, educational level, number of days working on the cleanup, and positive responses to questions about "affected daily activity" and "hospital visit due to work on cleanup". Conclusions : The results suggest that the HS oil spill had a significant impact on the psychological health of residents of Taean, but the comparability of the unexposed groups is a limitation of the study.

허베이스피릿호 유류유출사고 방제작업참여주민의 신경학적 이상과 우울증상

엄진희,정해관,하미나,권호장,하은희,홍윤철,최예용,정우철,허종일,이승민,김은정,이은희,이안소영,김종헌 한국역학회 2008 Epidemiology and Health Vol.30 No.2

Objectives: Hebei Spirit oil spill accident has brought about the worst coastal oil contamination in Korean history. Following the accident, residents and volunteers, number exceeding a million from nationwide, were exposed to chemicals from the crude oil itself and dispersants, including volatility organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and heavy metals through the clean-up works over months. This study was undertaken to investigate the effect of clean-up work on the peripheral nerve function and psychologic status of the residents after a prolonged exposure to clean-up work after the oil spill exposure. Methods: We performed a study on the residents of Jango-do Island, Chungnam, on 5 and 12 January 2008, six to eight weeks after the accident. A questionnaire on general characteristics, Korean Beck Depression Inventory (K-BDI), color vision test (Lanthony desaturated D-15 test), and vibration perception threshold test were done. Among 210 residents with 30 years or older, 63 (30%) finished questionnaires and completed at least one among K-BDI, color vision test, or vibration perception threshold test. Descriptive statistics was done on the residents. Results: The residents participated in clean-up work for average 20 days, max 30 days, during 6 weeks following the accident. Average work hours were 7.4 hours per day, max 10 hours. On K-BDI, 21 (33.3%) had a severe depressive state. Mean color confusion index was 1.29 in the right and 1.20 in the left. Mean vibration perception threshold was 3.69 VU (right) and 3.55 VU (left), respectively. Discussions and Conclusions: Compared to literature report, the residents had higher depression scale. Color vision threshold was not higher compared to general population near an industrial complex. Vibration perception threshold was significantly higher than the residents of similar age living near an abandoned mine in southern coastal area only in the age group of forties. These suggests there is some evidence of neuropsychiatric effect related to oil cleaning work and a mid- and long-term study of the oil exposure health effects with continuous monitoring should be done for the exposed residents in the affected area.

음극 벗김 전압전류법에 의한 셀렌의 정량

최원형(Won-Hyung Choi),허호장(Ho-Jang Hur) 한국분석과학회 1990 분석과학 Vol.3 No.1

Hebei Spirit Oil Spill Exposure and Subjective Symptoms in Residents Participating in Clean-Up Activities

정해관,하미나,이종승,권호장,하은희,홍윤철,최예용,정우철,허종일,이승민,김은정,임호섭 환경독성보건학회 2011 환경독성보건학회지 Vol.26 No.-

Objectives: This study was conducted to examine the relationship between crude oil exposure and physical symptoms among residents participating in clean-up work associated with the Hebei Spirit oil spill, 2007 in Korea. Methods: A total of 288 residents responded to a questionnaire regarding subjective physical symptoms, sociodemographic characteristics and clean-up activities that occurred between two and eight weeks after the accident. Additionally, the urine of 154 of the respondents was analyzed for metabolites of volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) and heavy metals. To compare the urinary levels of exposure biomarkers, the urine of 39 inland residents who were not directly exposed to the oil spill were analyzed. Results: Residents exposed to oil remnants through clean-up work showed associations between physical symptoms and the exposure levels defined in various ways, including days of work, degree of skin contamination, and levels of some urinary exposure biomarkers of VOCs, metabolites and metals, although no major abnormalities in urinary exposure biomarkers were observed. Conclusions: This study provides evidence of a relationship between crude oil exposure and acute human health effects and suggests the need for follow-up to evaluate the exposure status and long-term health effects of clean-up participants.

허베이스피릿호 유류유출사고 방제작업 참여자의 보호장비착용 효과

이승민,하미나,김은정,정우철,허종일,박석건,권호장,홍윤철,하은희,이종성,정봉철,이정애,임호섭,최예용,조용민,정해관,Lee, Seung-Min,Ha, Mi-Na,Kim, Eun-Jung,Jeong, Woo-Chul,Hur, Jong-Il,Park, Seok-Gun,Kwon, Ho-Jang,Hong, Yun-Chul,Ha, Eun-Hee,Lee, Jong-Se 대한예방의학회 2009 예방의학회지 Vol.42 No.2

Objectives : To assess the protective effects of wearing protective devices among the residents and volunteers who participated in the cleanup of the Hebei Spirit oil spill. Methods : A total of 288 residents and 724 volunteers were surveyed about symptoms, whether they were wearing protective devices and potential confounding variables. The questionnaires were administered from the second to the sixth week following the accident. Spot urine samples were collected and analyzed for metabolites of 4 volatile organic compounds(VOCs), 2 polycyclic aromatic hydrocarbons(PAHs), and 6 heavy metals. The association between the wearing of protective devices and various symptoms was assessed using a multiple logistic regression adjusted for confounding variables. A multiple generalized linear regression model adjusted for the covariates was used to test for a difference in least-square mean concentration of urinary biomarkers between residents who wore protective devices and those who did not. Results : Thirty nine to 98% of the residents and 62-98% of volunteers wore protective devices. Levels of fatigue and fever were higher among residents not wearing masks than among those who did wear masks(odds ratio 4.5; 95% confidence interval 1.23-19.86). Urinary mercury levels were found to be significantly higher among residents not wearing work clothes or boots(p<0.05). Conclusions : Because the survey was not performed during the initial high-exposure period, no significant difference was found in metabolite levels between people who wore protective devices and those who did not, except for mercury, whose biological half-life is more than 6 weeks.

허베이 스피릿호 유류유출사고 지역 산모의 BTEX 노출과 건강영향

김병미,박은교,이안소영,하미나,김은정,권호장,홍윤철,정우철,허종일,정해관,이종협,김종호,이보은,서주희,장문희,하은희,Kim, Byung-Mi,Park, Eun-Kyo,LeeAn, So-Young,Ha, Mi-Na,Kim, Eun-Jung,Kwon, Ho-Jang,Hong, Yun-Chul,Jeong, Woo-Chul,Hur, Jong-Il,Cheong, H 대한예방의학회 2009 예방의학회지 Vol.42 No.2

Objectives : We evaluated the health effects of exposure to BTEX(Benzene, Toluene, Ethylbenzene, m,p-Xylene, o-Xylene) in the Taean area after the Hebei Spirit oil spill. Methods : We used a questionnaire survey to look for health effects among 80 pregnant women 2 to 3 months following the Hebei Spirit oil spill. Their BTEX exposures were estimated using the CALPUFF method. We then used a multiple logistic regression analysis to evaluate the effects of BTEX exposure on the women s health effets. Results : Pregnant women who lived near the accident site reported more symptoms of eye irritation and headache than those who lived farther from the site. There was a trend of decreasing symptoms with an increase in distance from the spill site. Pregnant women exposed to higher ambient cumulative levels of Xylene were significantly more likely to report symptoms of the skin(OR 8.01 95% CI=1.74-36.76) in the first day after the accident and significantly more likely to report abdominal pain(OR 3.86 95% CI=1.02-14.59 for Ethylbenzene, OR 6.70 95% CI=1.82-24.62 for Xylene) during the 1st through 4th days following the accident. Conclusions : This study suggests that exposure to BTEX from an oil spill is correlated with an increased risk of health effects among pregnant women. This implies the need to take proper measures, including the development of a national policy for environmental health emergencies and a plan for studying the short- and long-term chronic health effects associated with such spills.

태안지역에 거주하는 산모들의 유류노출에 따른 건강 영향 평가

유재홍,하은희,김병미,이보은,박은교,정해관,홍윤철,하미나,권호장,최예용,정우철,허종일,서미원,이안소영 대한산업의학회 2008 대한직업환경의학회 학술대회 논문집 Vol.41 No.-

시판 젓갈중의 중금속 및 유기염소 잔유농약의 함량

류병호(Beung-Ho Ryu),하미숙(Mi-Suck Ha),김동석(Dong-Seuk Kim),신동분(Dong-Bun Sin),허호장(Ho-Jang Hur),정종순(Jong-Soon Jung) 한국식품영양과학회 1986 한국식품영양과학회지 Vol.15 No.3

명란젓, 대구아가미젓, 바지락젓, 새우젓, 창란젓, 꼴뚜기젓, 계젓, 멸치젓, 오징어젓, 조개젓에 대한 重金屬 및 유기인계 殘留農業에 대한 分析결과는 다음과 같다. 수은함량은 0.11~0.46ppm이었고, 납은 含量은 ND~1.3ppm, 카드륨 함량은 0.01~0.34ppm이며 구리함량은 0.4~5.98ppm, 아연함량은 0.16~4.5ppm, 망간함량은 0.02~0.49ppm으로 상당히 낮으며 비소함량은 검출되지 않는 젓갈이 많았다. 有機鹽素 잔유농약의 含量은 Total BHC는 멸치젓이 0.3~1.825ppb 였고 계젓, 멸치젓에서는 PP'-DDE, Dieldrin, PP'-DDD, PP'-DDT가 다소 검출되었으나 나머지 젓갈에서는 검출되지 않았다. 우리나라 허용기준과 비교해 볼때 젓갈 중의 중금속 및 잔유농약은 식품위생상 안전하다고 볼 수 있다. Heavy metal contents and residues level of organochlorine pesticides were analyzed for commercial salted and fermented sea-food which bought from pusan area.<br/> Heavy metal contents ranged from 0.11 to 0.46 ppm of mercury, trace to 1.1 ppm of lead, 0.01 to 0.34 ppm of cadmium, 0.4 to 5.98 ppm of cupper, 0.16 to 4.5 ppm of zinc, trace to 0.49 ppm of manganese and trace to 1.35 ppm of arsenic.<br/> Residue level of organochlorine pesticides in salted and fermented sea-foods ranged from 0.3 ppb to 1.825 ppb of total BHC Organochlorine pesticides of DDE, dieldrine, pp'-DDD and pp'-DDT were detected a small amount from Ge jeot and Myeol-Chi jeot. In conclusion, the heavy metal and levels of organochlorine pesticides residues were safety to eat the salted and fermented sea foods.