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排序方式: 共有74条查询结果,搜索用时 31 毫秒
61.
Phan NT Kim KH Jeon EC Kim UH Sohn JR Pandey SK 《Environmental monitoring and assessment》2012,184(3):1683-1692
A number of volatile organic compounds (VOCs) including acetone, methyl ethyl ketone, toluene, ethylbenzene, m,p-xylene, styrene, and o- xylene released during food decaying processes were measured from three types of decaying food samples (Kimchi (KC), fresh
fish (FF), and salted fish (SF)). To begin with, all the food samples were contained in a 100-mL throwaway syringe. These
samples were then analyzed sequentially for up to a 14-day period. The patterns of VOC release contrasted sharply between
two types of fish (FF and SF) and KC samples. A comparison of data in terms of total VOC showed that the mean values for the
two fish types were in the similar magnitude with 280 ± 579 (FF) and 504 ± 1,089 ppmC (SF), while that for KC was much lower
with 16.4 ± 7.6 ppmC. There were strong variations in VOC emission patterns during the food decaying processes between fishes
and KC that are characterized most sensitively by such component as styrene. The overall results of this study indicate that
concentration levels of the VOCs differed significantly between the food types and with the extent of decaying levels through
time. 相似文献
62.
The effects of hydroxyapatite (HAP) on dechlorination of tetrachloroethylene (PCE) by zero-valent zinc (ZVZ) were examined in batch systems. PCE was primarily transformed to trichloroethylene by ZVZ, with 1,2-trans-dichloroethylene representing a minor product. Dechlorination of PCE was accelerated by the presence of HAP, and the pseudo-first order rate constants increased with increasing amount of HAP. Zn(II), mostly generated from oxidative dissolution of ZVZ by PCE, was effectively removed from the solution by HAP. Ion substitution, coprecipitation, and adsorption are proposed as the possible mechanisms for Zn(II) removal. These reactions appeared to occur simultaneously and the contribution of each reaction to overall removal of Zn(II) was primarily dependent on HAP loading at constant ZVZ loading. The results indicate that the use of HAP in combination with conventional zero-valent metals is promising in that it can achieve both degradation of organic contaminants and stabilization of inorganic contaminants. 相似文献
63.
Pal R Kim KH Jeon EC Song SK Shon ZH Park SY Lee KH Hwang SJ Oh JM Koo YS 《Environmental monitoring and assessment》2009,148(1-4):109-125
The atmospheric concentrations of several reduced sulfur compounds (RSCs) including H(2)S, CH(3)SH, DMS, CS(2), and DMDS were measured concurrently from a series of field campaigns covering multiple locations in the surroundings of a large industrial region (August 2004 to September 2005). These field studies have been designed and undertaken to inspect the concentrations of RSCs in ambient air. The RSC concentrations were found to occur in a highly variable range. H(2)S (1.06 +/- 2.07 ppb) was found to be the most abundant RSC followed by CS(2) (0.84 +/- 0.54 ppb), DMDS (0.36 +/- 1.21 ppb), DMS (0.24 +/- 0.83 ppb), and CH(3)SH (0.11 +/- 0.23 ppb). The RSC levels measured at the study area were comparable to those observed previously from other polluted environmental settings. When these RSC data were examined further in terms of spatial (industrial vs. non-industrial sites) and seasonal (summer vs. winter seasons) grouping schemes, differences in their concentration levels were statistically insignificant in most cases. In contrast, there were fairly strong variations in temporal patterns over a diurnal cycle. If these RSC concentration data were converted to diagnose the malodor strengths, their effects were in most cases insignificant with minor contribution towards odor nuisances. 相似文献
64.
Paul Olusegun Bankole Kirk Taylor Semple Byong-Hun Jeon Sanjay Prabhu Govindwar 《Frontiers of Environmental Science & Engineering》2020,14(6):113
65.
Yoon Youngsam Lee Suyoung Kim KiHeon Jeon Taewan Shin Sunkyoung 《Journal of Material Cycles and Waste Management》2018,20(1):283-292
Journal of Material Cycles and Waste Management - The study conducted basic component analyses including three component analyses, elementary analysis and heavy metal content and BMP test according... 相似文献
66.
Young-Yeul Kang Tae-Wan Jeon Woo-Il Kim Sun Kyoung Shin Jin-Mo Yeon Swarnalatha Somasundaram 《Journal of Material Cycles and Waste Management》2014,16(3):566-575
To harmonize with international standards, the Republic of Korea is in the process of converting its current hazardous waste classification system and setting up regulatory standards for all toxic substances present in hazardous waste. Detailed characterization of each form of hazardous waste belonging to five chemical processes and their correlations were studied. In the present work, the concentrations of 13 heavy metals, F?, CN?, 7 PAH compounds, total PCDD/F and 7 PCB isomers present in the hazardous waste generated among chemical processes such as synthetic rubber (SR), man-made fibers (MF), organic dyes and pigments (DP), pharmaceuticals and cosmetics were analyzed along with their leaching characteristics. Comparing all the processes, most of the heavy metal concentrations were high in SR waste. Naphthalene was the dominant PAH in most of the chemical process waste. PCDD/F concentrations of the samples were in the range of 0.001–0.003 ng I-TEQ/g. PCB isomer-101 and isomer-118 were found to be slightly higher than the permissible limit in the SR filter cake sample. SR process wastes doesn’t show any resemblance with the other process waste in either the heavy metals and PAH trend. Each sample from DP and MF were suitable only for hazardous waste landfill. 相似文献
67.
68.
Yong-Kook Kwon Hyun-Whee Bae Sun Kyoung Shin Tae-Wan Jeon Jungju Seo Geum-Sook Hwang 《Environmental science and pollution research international》2014,21(17):10453-10460
Leachate, generated by the decomposition of animal carcasses, presents many environmental, sanitary, and food safety hazards. However, research on the characteristics of leachate is lacking. In this study, we performed biochemical profiling of leachate from two animal species (pig and cattle) in two soil types (sandy loam and sandy soil) using 1H-NMR-based profiling, followed by multivariate data analysis. The leachate was collected from a well-controlled artificial burial site over a 31-week period. Principal components analysis (PCA) of the NMR data showed similar patterns between species and soil types. Organic components, including organic acids and phenols, predominated, and their levels increased with time. The methylamine level in leachate from pig carcasses 18 weeks following burial was significantly higher than that from cattle carcasses; leachate from cattle carcasses in sandy soil 1 week after burial contained unique components (specifically ethanol, formate, alanine, N-methylation, and taurine), in contrast with those from sandy loam soil. This study suggests that a NMR-based profiling approach is useful to characterize the organic components in leachate from animal carcasses over time. 相似文献
69.
The use of the phosphorescent guidance sign is increasing. To evaluate the changes of human behavior when a phosphorescent guidance sign was installed on the floor, the evacuation experiment was carried out. The main evacuation experiment was conducted in impaired visibility conditions at the subway station with 103 subjects. Characteristic features of changes regarding evacuation time, moving speed and evacuation route were mainly discussed in this paper. In addition, the changes of evacuation were evaluated by using the estimated velocity and relative order index. This study also introduced the method to simulate impaired visibility caused by smoke when an evacuation experiment was carried out. The results showed that the phosphorescent guidance sign facilitated evacuation due to a decrease in the evacuation route. The moving speed increased only when the phosphorescent sign was installed at intervals smaller than a person's step. 相似文献
70.
H.-H. Kim C.-S. Lee J.-M. Jeon S.-D. Yu C.-W. Lee J.-H. Park D.-C. Shin Y.-W. Lim 《Environmental science and pollution research international》2013,20(7):4831-4846
The objectives of this study were to survey elementary school students regarding the environmental conditions of their elementary schools and to assess the relationship between air pollution and allergic disease using the International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire. Therefore, this study was designed as a cross-sectional study. In this study, seven elementary schools were selected and they were classified into three categories. The selection included one school with no traffic-related or other pollutants, three with traffic-related pollutants, and three with traffic-related and other pollutants from industrial and filling station sources. The ISAAC questionnaire survey was given to all of the students except to those in the 1st grade who were presumed to be less likely to be exposed to the school environment than the remainder of the students attending those seven schools. The assessment of allergic disease was conducted on a total of 4,545 students. Three school zones with critical exposure were selected within each school and they were evaluated based on the levels of black carbon (BC), PM10, SO2, NO2, and O3. There was a significant increase in the risks based on the odds ratios of treatment experiences (within 1 year) for allergy-related diseases such as asthma and allergic rhinitis (a) in the school group with traffic-related pollutants and the school group with complex pollutants were 2.12 (1.41–3.19) and 1.59 (1.06–2.37), respectively, in comparison to the school groups with no exposure to pollutants. This was determined based on the odds ratio of symptoms and treatment experiences for allergy-related diseases by group based on the home town zone as a reference. Also, in the case of atopic dermatitis, the odds ratio of treatment experiences (within 1 year) was 1.42 (1.02–1.97), which indicated elevated risks compared to the students in the S1 school. A regression analysis was used to assess the relationship between the substances and the symptomatic experiences within the last year. There were significant increases in the odds ratio of the symptoms associated with allergic rhinitis and the BC and SO2 in the complex pollution areas. The results of the assessment of the relationship between atopic dermatitis-associated symptoms and O3 showed that the odds ratio increased with statistical significance. 相似文献