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RISS 인기검색어
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- 저자 : 김승규 ( Seung Kyu Kim ) (검색결과 48 건)
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Variation and uncertainty of microplastics in commercial table salts
Seung-Kyu Kim(김승규),Nan-Seon Song(송난선),Ji-Su Kim(김지수),Hee-Jee Lee(이희지) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Increasing concern of human exposure to microplastics (MPs) necessitates an assessment of the quality of MP data relevant to human exposure. In this literature review for table salt, we addressed the variability and uncertainty of MP data caused by different analytical methods among studies. Additionally, validation experiment was conducted to identify and correct uncertainties related to MP size. When combined without validation, salt data in literature (n=150) showed a wide range of 0–39800 (1386±5477) MPs kg<sup>-1</sup>. All procedures, including sample treatment, MP identification, and quality assurance were related to this variability. Most serious variability originated from the MP identification methods associated with minimum cut-off size of targeted/measured MPs and the selection of particles identified. When not corrected by size, MP content differed by 10–600 times among MP identification methods, with greatest value from visual observation, followed by FTIR and Raman methods. Meanwhile, there was a significant correlation—regardless of identification method—between logarithmic mean abundances and minimum cut-off sizes. The size-corrected values showed that adults intake up to 19000 MPs ≥10 μm annually via table salt, compared with 5100 MPs that was estimated from uncorrected mean abundance. Our validation experiment also showed the possibility of serious errors being caused by arbitrary selection of “MP-like particles” in spectroscopic analysis, specifically for smaller-sized particles. A combination of unverified data originated from different methods might have failed to adequately produce reliable human health-relevant results, thereby undermining the ability to quantify human risk.
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농업 토양에서의 토지이용도별 미세플라스틱 잔류특성과 의미
김승규 ( Seung-kyu Kim ),김지수 ( Ji-su Kim ),이황 ( Hwang Lee ),이희지 ( Hee Ji Lee ) 한국환경농학회 2020 한국환경농학회 학술발표논문집 Vol.2020 No.-
Plastic production has increased exponentially over the last decades. Around 79% of 6.3 billion metric tons of plastic waste produced is estimated to accumulate in landfill and the natural environment. Considering that most of marine plastic debris originate from the inland, the research necessity on the occurrence of microplastics in the inland environment. Particularly, concerns are made to the agricultural environment in which various plastic products are used and are generated to waste. Plastic mulching has grown rapidly in recent years worldwide. According to recent estimation, polyethylene (PE) film widely in use in Korean farmland for greenhouse and soil mulching accounts for 97% of plastic film generated and only 64% of generated waste is retrieved. Little is known regarding the microplastics in Korean agricultural environment, although large amounts of microplastics is estimated to occur. This talk presents how and why the occurrence characteristics of microplastics in different land use types of Korean agricultural soil differ each other.
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비탄력성 테이프와 탄력성 테이프의 적용이 앞쪽머리자세 환자의 통증과 머리척추각 및 균형능력에 미치는 영향
김승규 ( Seung-Kyu Kim ),황보각 ( Gak HwangBo ) 대한물리의학회 2022 대한물리의학회지 Vol.17 No.4
PURPOSE: This study was conducted to investigate the effects of non-elastic and elastic tapes on pain, craniovertebral angle, and balance in forward head posture (FHP) patients. METHODS: A total of 44 adults with FHP were randomly assigned to a group that performed a stretching exercise after non-elastic taping (n = 22) and another group that performed the stretching exercise after elastic taping (n = 22), respectively. The stretching exercise was performed five times a week for 30 minutes per session. The visual analogue scale was used to compare neck pain, the craniovertebral angle was measured to compare alignment, and the limit of stability was measured to compare balance. RESULTS: The groups that performed the stretching exercise after both elastic and non-elastic taping showed significant positive changes in pain and the craniovertebral angle of the head in pre- post measurements (p < .05). In the follow-up test for the pain and craniovertebral angle, there was no significant difference from the post-test in the non-elastic group (p > .05), but a significant difference was seen in the elastic group (p < .05). CONCLUSION: Stretching exercises with taping for patients with a FHP are more effective in improving pain and alignment. However, the short-duration tape application did not affect the balancing ability. When the non-elastic tape was used, the effect lasted longer than that of the elastic tape, and pain relief was effective in the case of the elastic tape. Therefore, tape therapy would be more effective if customized according to the patient's condition.
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잠재적 POPs로서의 과불소화화합물의 환경내 분포 및 거동
김승규(Seung-Kyu Kim) 환경독성보건학회 2008 환경독성보건학회지 Vol.23 No.3
Concern about perfluorinated compounds (PFCs) is growing nationally as well as globally. PFCs could be considered emerging POPs due to their environmentally persistent, bioaccumulative, and potentially harmful properties. Moreover, perfluoroalkylates (PFAs) such as PFOS and PFOA are reported to experience long-range transport (LRT) to the Arctic in spite of their low volatility and strong solubility. The possible pathways contributing to LRT have been proposed but are still in debate in combination with unclear source definition and uncertain physico-chemical properties. The environmental fate of PFCs is more complicated because of the presence of precursors that are degraded to PFAs and are extremely different from their daughters, PFAs, in physico-chemical properties. To what extent and through what pathways are human and wildlife exposed is determined by the environmental fate and distribution of PFCs. To define uncertainties in fate and distribution thus is critical to prevent erroneous policy and/or determination related with exposure and risk reduction. This article aimed to review controversy and/or uncertain issues for the environmental fate and distribution of PFCs and to prospect research topics necessary to dissolve uncertainties.
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