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이온화식 상수도관 내부 부식억제기의 철 시편에 대한 부식억제 효과측정
유미선 ( Mee-seon Yu ),양성봉 ( Sung-bong Yang ),심학섭 ( Hak-sup Shim ),이승혁 ( Seung-hyeok Lee ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
This study aimed to measure the anti-corrosion effect of the zinc ionization device in running water. Cartridges of iron coupons were immersed in 2 plastic pipes that had flown the tap water for 20 days. Initial and final concentrations of ferrous ion and zinc cation in water were measured and weight losses of each coupon were weighed. And finally corrosion area of each coupons was compared with analyzing black and white figure of each corroded coupon by use of Image J program. Average weight loss of the coupons in running water with no corrosion inhibitor is 486 ㎎/dm<sup>2</sup> for 20 days, whereas that of coupons with the corrosion inhibitor is 438 ㎎/dm<sup>2</sup> for same period. Relative anti-corrosion effect of the inhibitor was calculated to be only 9.8 % with weight loss method. Average % areas of each corroded coupons with the inhibitor or no inhibitor were 20.5 % and 43.9 %. Relative anti-corrosion effect shown by average corroded area was 53.3 %. Inhibition effect of zinc ionization device in tap water indicated that corrosion area on the iron-coupon surface was decreased largely by dissolving zinc ion from zinc metal in water even though difference of weight loss of iron coupon was very small.
연구노트 : 대기오염 측정 자료에 의한 지방도시의 대기환경규제지역 설정에 관한 타당성 검토
유미선 ( Mee Seon Yu ),양성봉 ( Sung Bong Yang ),우경빈 ( Kyung Bin Woo ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.1
Regional air quality regulation is a system that allows the Minister of Environment to designate the local area as air quality control region where the concentrations of air pollutants are exceeding the environmental standards, and the local governments that administrate the regulated area have to develop and practise a plan for reducing the air pollutants. From the data observed yearly by the monitoring stations in 8 provincial cities with more than 0.5 million people was judged the compliance with air quality standards in each municipality for the period of 2003 to 2013. As the result of investigation on air pollutants concentrations of each city, it was found that there was no station that exceeds the ambient air quality standards of CO, SO_{2} and 24-hour NO_{2}. But all municipalities exceeded the standards of 8-hour O_{3}, annual and 24-hour PM10, and therefore 8 municipalities can be designated to be under the local air regulation. For the annual NO_{2} were the monitoring sites necessary requirements for designation of the air quality regulation region in Cheongju, Cheonan, Daejeon and Gwangju area. Incase of 1-hour O_{3}, some of stations in Pohang, Cheongju, Cheonan and Changwon area were over the designation standards for the air quality control region.
유미선 ( Mee Seon Yu ),양성봉 ( Sung Bong Yang ),하남기 ( Nam Ki Ha ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.12
In this study, the detection limits of lower fatty acids in air were investigated by using Dynamic SPME(Solid Phase Micro-Extraction), i.e. improved Head Space - SPME method(HS-SPME). This Dynamic SPME, called SPDE(Solid Phase Dynamic Extraction), is the analytical method for volatile compounds in air with the extraction by using a stainless steel needle of which inner surface is coated with adsorption material and following the gas chromatographic analysis by inserting the needle into a injection port of GC and subsequently, desorption of the volatile compounds into a gas- chromatographic column. Extraction was carried out by passing the sample air through the needle with a suction pump which has been used for a detection tube. The result of measurement for the 6 lower fatty acids showed that the detection limits ranged from 0.10 ppm to 0.44 ppm and the linear correlation coefficients were over 0.99. Relative standard deviations obtained from 5 analytical repetition of a ca. 1.6 ppm standard mixture were in the range of 1.87%~2.47%. This method has been shown to be a adequate for the measuring C2~C5 fatty acids in air in the concentrations of over several hundreds ppb.
울산 산업단지인근 해변지역에서의 저 농도 황화수소 측정
유미선 ( Mee Seon Yu ),양성봉 ( Sung-bong Yang ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.11
Concentrations of hydrogen sulfide in ambient air have been measured from January 2014 to June 2016 in a coastal area near the Ulsan National Industrial Complex. The measurement sites were 1 km, 2.6 km, 5.6 km, and 20 km away from a kraft pulp mill, which is located at the most southern edge of the complex. Concentrations above 0.4 ppb were monitored every 5 min and the highest concentration of the day was determined. From a total of 775 measurement days, hydrogen sulfide concentrations > 20 ppb were recorded on 36 and 38 days at the measurement site closest to the mill and the residential area 2.6 km away from the mill, respectively. At the site farthest from the mill, the concentrations were always 20 ppb lower than the malodor regulation for the residential area but sometimes higher than the odor recognition threshold for hydrogen sulfide. Although several emission sources of hydrogen sulfide have been published in the Pollutant Release and Transfer Register of Korea, the kraft pulp mill is considered to be the biggest contributor of atmospheric hydrogen sulfide in the southern coastal area of Ulsan.
아연 이온화 장치의 상수 중 철 시편과 수도 배관에 미치는 부식억제 효과 예측
유미선 ( Mee-seon Yu ),이승혁 ( Seung-hyeok Lee ),최정욱 ( Jung-wook Choi ),심학섭 ( Hak-sup Shim ),양성봉 ( Sung-bong Yang ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.3
This study quantitatively investigated the inhibition effect of corrosion on iron coupons and water pipes by ionization of zinc metal in tap water line. After installing iron coupons into water pipes and running tap water for 20 days, the average difference of the annual corrosion rates calculated from the weight losses of iron coupons with or without the ionization device was estimated to be 12.8 %. Comparing corrosion rates with or without corrosion inhibitor on new iron coupons showed higher difference in corrosion rates, but over time, the difference of corrosion rates between absence and presence of inhibitor had decreased gradually. It was also confirmed that the less rust-free pure iron area on the iron specimen and the less pure iron surface to react with oxygen in water gradually reduces the corrosion rate. X-ray diffraction analysis of the rust generated on iron coupons confirmed that most of them were red hematite(Fe<sub>2</sub>O<sub>3</sub>), and that some of the blackish parts were magnetite. It is known that the rust generated causes red tap water to fall, some of which develop into foot corrosion, resulting in pin-holes in the water pipes. Therefore, based on existing research results, we predicted the breaking time due to foot corrosion of iron coupons with or without corrosion inhibitors. Zinc corrosion suppressors were installed in water pipes where corrosion had already progressed and rusted, and the internal surface of the water pipes was observed to increase the relative ratio of the black magnetite components over time, and it was believed that corrosion suppressors could be expected for a long time.
유미선(Mee-Seon Yu),양성봉(Sung-Bong Yang),하남기(Nam Ki Ha),이은영(Eun Young Lee) 한국냄새환경학회 2010 실내환경 및 냄새 학회지 Vol.9 No.4
국내 양돈장 2곳과 일본의 양돈장 1곳을 방문하여 질소계 화합물과 관능에 의한 희석배수와 악취세기를 조사하였다. 비교적 악취에 대한 제어가 실시되고 있는 양돈장에서의 관능에 의한 측정치가 악취제어가 실시되고 있지 않은 시설에 비해 낮은 수준을 나타내었으며, 이와 동시에 질소계 화합물의 분석의 결과도 유사한 경향을 나타냄을 확인할 수 있었다. 이러한 결과는 환기나 탈취제 분무, 악취제어용 사료첨가제 사용 등에 의해 양돈장에서 발생되는 악취 및 악취의 원인이 되는 휘발성 질소계 화합물의 발생을 어느 정도 제어될 수 있음을 의미하였다. Odor intensities, odor concentrations and volatile amine compounds were investigated at the two piggeries in Korea and the one in Japan. It was confirmed that the piggery where odor control had been carried out intentionally showed the lower values of sensory measurement than those where the odor control had not been under consideration and also found that the concentrations of volatile amines in the odor-controlled piggery showed lower values rather than the uncontrolled. In this investigation, we conclude that the activities such as circulation of air in pig houses, spraying deodorants and feeding the additive that is effective for reducing malodors from piggery could decrease the odors and the concentrations of volatile amines that are the cause of offensive odors from piggery.
석유정제산업에서의 유기성 유해대기오염물질의 비산배출량 산정
양성봉(Sung-Bong Yang),유미선(Mee-Seon Yu),이영준(Young Joon Lee),유은진(Eun-Jin Yoo),최성헌(Sung-Hyun Choi) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2
Hazardous air pollutants emitted from the oil refinery plant were surveyed from 1993 US and 2005 Korean TRI data. Toluene, xylene, methanol, MTBE and n-hexane, relatively large in amount of fugitive emission, are considered as candidates of newly designated HAPs in Korea. The sealed oil pump, one of equipments among fugitive sources in the crude oil distillation tower was examined for the estimation of amounts of annual HAPs emissions according to several calculation methods using registered emission factors. Emission rates showed to be decreased with following calculation factors; average emission factor>pegged emission factor>concentration emission factor>correlation equation. Annual emission amounts of benzene, toluene, xylene, ethyl benzene and nhexane from the distillation tower were estimated and amounts of these HAPs calculated with TVOC concentrations obtained from LDAR program and correlation equations showed only 6% of those from using concentration factors.