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Volume and toxic composition of Leachate from an Open Dump

Journal of Environmental Science and Engineering 2011年第9期5卷 1131-1140页

作者： O. Buenrostro R. Alfaro I. Israde L. Marquez Solid Waste and Environment Laboratory Forestry and Agronomics Research Institute University of Michoacan of Saint Nicholas Hidalgo Morelia 58880 Mexico Chemical-Biological Research Institute University of Michoacan of Saint Nicholas Hidalgo Morelia 58880 Mexico Geology and Mineralogy Department Metallurgical Research Institute University of Michoacan of Saint Nicholas Hidalgo Morelia 58880. Mexico

In Mexico, hazardous and non-hazardous urban solid wastes are commonly disposed of in dumps. Inappropriate waste disposal makes solid waste disposal sites potential sources of pollution and health risks. The objective of the present study was to evaluate the impact of leachate from a dump on surface water systems. Physical, chemical, and bacteriological characteristics and the volume of leachate were measured. The site of study is located in Zinaprcuaro, Michoac^m, Mexico, and was chosen due to the water supplies were in line with the dump, thus conforming a system to test for movement of toxins. Leachate and water from three ponds located at different distances to the dump were sampled during three months of a year to measure physicochemical and bacteriological parameters, according to the standard methods of the American Public Health Association; the concentration of heavy metals was measured by atomic absorption spectrometry. Most characteristics exceed the maximum permissible limits established for the Mexican legislation regarding wastewater discharges and drinking water. Likewise, analysis of variance showed statistically significant differences between concentrations of pollutants in relation to the distance from the dump of sampled sites and with season of sampling, thus confirming the contamination of water by dump leachate.

关键词： toxic composition leachate solid waste open dump

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Zn^(2+) loading as a critical contributor to the circ_0008553-mediated oxidative stress and inflammation in response to PM_(2.5) exposures

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Journal of Environmental Sciences 2023年第2期124卷 451-461页

作者： Jingzhou Wang Jianbo Jia Dujia Wang Xiujiao Pan Haiyan Xiong Chengjun Li Yiguo Jiang Bing Yan Institute of Environmental Research at Greater Bay Area Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Shandong UniversityQingdao 266237China Institute for Chemical Carcinogenesis Guangzhou Medical UniversityGuangzhou 511436China

Inflammation is a major adverse outcome induced by inhaled particulate matter with a diameter of≤2.5μm(PM_(2.5)),and a critical trigger ofmost PM_(2.5) exposure-associated ***,the key molecular events regulating the PM_(2.5)-induced airway inflammation are yet to be *** the critical role of circular RNAs(circRNAs)in regulating inflammation,we predicted 11 circRNAs that may be involved in the PM_(2.5)-induced airway inflammation using three previously reportedmiRNAs through the starBasewebsite.A novel circRNA circ_0008553 was identified to be responsible for the PM_(2.5)-activated inflammatory response in human bronchial epithelial cells(16HBE)via inducing oxidative *** a combinatorial model PM_(2.5) library,we found that the synergistic effect of the insoluble core and loaded Zn^(2+)ions at environmentally relevant concentrations was the major contributor to the upregulation of circ_0008553 and subsequent induction of oxidative stress and inflammation in response to PM2.5 *** findings provided new insight into the intervention of PM_(2.5)-induced adverse outcomes.

关键词： PM(2.5) toxic composition Combinatorial model PM_(2.5)library Circ_0008553 Inflammation

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