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441.
Yoon Sanghyuck Choi Wonyoung Jeon Chansoo 《Journal of Material Cycles and Waste Management》2022,24(5):1878-1892
Journal of Material Cycles and Waste Management - The hydration characteristics of mixed cement containing fine powder of blast-furnace slag and expandable material were examined by X-ray... 相似文献
442.
Yeowool Choi Kihong Park Injeong Kim Sang D. Kim 《Environmental geochemistry and health》2018,40(1):271-282
Many studies have demonstrated that heavy metals existing as a mixture in the atmospheric environment cause adverse effects on human health and are important key factors of cytotoxicity; however, little investigation has been conducted on a toxicological study of a metal mixture from atmospheric fine particulate matter. The objective of this study was to predict the combined effects of heavy metals in aerosol by using in vitro human cells and obtain a suitable mixture toxicity model. Arsenic, nickel, and lead were selected for mixtures exposed to A549 human lung cancer cells. Cell proliferation (WST-1), glutathione (GSH), and interleukin (IL)-8 inhibition were observed and applied to the prediction models of mixture toxicity, concentration addition (CA) and independent action (IA). The total mixture concentrations were set by an IC10-fixed ratio of individual toxicity to be more realistic for mortality and enzyme inhibition tests. The results showed that the IA model was statistically closer to the observed results than the CA model in mortality, indicating dissimilar modes of action. For the GSH inhibition, the results predicted by the IA and CA models were highly overestimated relative to mortality. Meanwhile, the IL-8 results were stable with no significant change in immune reaction related to inflammation. In conclusion, the IA model is a rapid prediction model in heavy metals mixtures; mortality, as a total outcome of cell response, is a good tool for demonstrating the combined toxicity rather than other biochemical responses. 相似文献
443.
Kim KH Mishra VK Kang CH Choi KC Kim YJ Kim DS 《Journal of environmental management》2006,78(2):170-182
The ionic composition of PM2.5 and PM10 was investigated using PM samples collected from Seoul and Busan during the winter of 2002. Based on the measurement data, we attempted to investigate the relative roles of different source processes in the composition of airborne particles at the two distinct urban areas. According to our measurements, the major components of both PM fractions were clearly distinguished from each other at the two different sites. It was found that the ionic concentrations in coarse fractions were generally compatible with each other at the two sites (NH(4)(+), NO(3)(-), NSSS, etc.). However, differences in their concentration levels were significant in the fine fractions and their mass concentration levels in Seoul exhibit threefold enhancement relative to Busan. The results further indicated that anthropogenic signatures were generally more evident in the fine rather than coarse fractions at both sites. However, a comparison of the coarse fraction data indicated the dominance of natural (oceanic) processes at the Busan site and conservative relationships among the different ionic components. The results of the back trajectory analysis confirmed that air mass movement patterns influence the ionic compositions of PM across different particle fractions and between different study sites. 相似文献
444.
Lee Young Su Kim Young Kwon Choi Eunhwa Jo Hyeri Hyun Hyeseung Yi Seung-Muk Kim Jae Young 《Environmental science and pollution research international》2022,29(44):66591-66604
Environmental Science and Pollution Research - The emission sources and their health risks of fine particulate matter (PM2.5) in Siheung, Republic of Korea, were investigated as a middle-sized... 相似文献
445.
Theerthagiri Jayaraman Park Juhyeon Das Himadri Tanaya Rahamathulla Nihila Cardoso Eduardo S. F. Murthy Arun Prasad Maia Gilberto Vo Dai‑Viet N. Choi Myong Yong 《Environmental Chemistry Letters》2022,20(5):2929-2949
Environmental Chemistry Letters - The electrocatalytic reduction of nitrate waste into ammonia allows both the removal of nitrate contaminants and an alternative production of ammonia compared to... 相似文献