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61.
Surface sediments of the lagoons of Lomé, Togo, were analyzed for mercury, methylmercury, and trace elements. Concentrations
were greater than typical for natural lagoon sediments, and with greater variability within the Eastern lagoon compared to
the Western one. The Eastern lagoon is larger and has been dredged in the past, while the Western lagoon, which also receives
major waste inputs, has not been dredged and shows less tidal flushing. Accordingly, one naturally believes that the Eastern
lagoon is cleaner and probably safe to use due to its natural resources, including fishes to eat. Unexpectedly, we describe
here that mercury methylation was greater in the Eastern lagoon, indicating increased bioavailability of mercury, as probably
facilitated by past dredging that decreased solid-phase retention of inorganic mercury. Urbanization has historically been
more developed in the southern part of the lagoons, which is still reflected in contamination levels of sediment despite dredging,
probably because sources of contamination are still more important there today. Such urban contamination emphasizes the need
to regulate waste discharges and possible airborne contamination in growing cities of developing countries, and implements
environmental and public health monitoring, especially in relation to misbelieves systematically associated with the cleansing
effect of dredging activity. 相似文献
62.
63.
微波萃取技术在分析土壤中有机污染物的应用 总被引:13,自引:0,他引:13
介绍了微波萃取技术及其使用的试剂、设备和条件,对微波萃取在分析土壤中有机污染物的应用予以综述,阐述了微波萃取技术是分析土壤中有机污染物的好方法。 相似文献
64.
徐庆 《环境监测管理与技术》2014,26(2):56-59
综合考虑国外优先控制污染物筛选的方法,根据上海市集中式生活饮用水源地特定80项和地表水控制的109项以外项目、全市挥发性和半挥发性有机项目、水源地突发性应急事故有机污染物等实际监测数据和历年来微量有机污染物研究成果,制定饮用水源地优先控制有机污染物筛选的原则、程序和过程,对出现频率高、超标几率高、浓度高,可能对人体健康产生影响的有机污染物进行筛选,提出包括多环芳烃、酞酸酯、卤代烃和其他共4类7种上海市饮用水源地优先控制有机污染物名单. 相似文献
65.
采用在线监测和实验室分析方法,分别在热光透射法(TOT)NIOSH 5040、870升温协议和热光反射法(TOR)IMPROVE-A升温协议下测定PM2.5中有机碳(OC)、元素碳(EC),并将各测定结果做比对分析。结果表明,在线监测(NIOSH 5040)与实验室分析(IMPROVE-A)结果的相关系数R>0.8,总体相关性较好,EC值差异略大;在线监测与实验室分析在NIOSH 870协议下TC测定值总体相近,OC与EC测定值略有差异;在线监测中NIOSH 5040协议下的OC测定值略低于870协议,EC测定值略高于870协议,日常监测中两种温度协议均可选择。 相似文献
66.
我国环境中有机污染物分析方法及痕量富集技术的进展 总被引:10,自引:8,他引:10
综述了我国环境中有机污染物的分析方法和痕量富集技术,介绍了吹扫-捕集法、固相微萃取技术、固相萃取技术、半渗透膜采样技术与分析仪器联用在有机污染物测定中的应用情况。 相似文献
67.
Xinjie Wang Yang Li Jian Zhao Hong Yao Siqi Chu Zimu Song Zongxian He Wen Zhang 《Frontiers of Environmental Science & Engineering》2020,14(4):56
68.
Peidong Su Xiangyu Gao Junke Zhang Ridha Djellabi Bo Yang Qi Wu Zhen Wen 《Frontiers of Environmental Science & Engineering》2021,15(6):130
69.
Lingyun Zhao Nan Li Tinglin Huang Haihan Zhang Fan Si Kai Li Yunzhi Qi Fengyao Hua Cheng Huang 《环境科学学报(英文版)》2022,34(1):130-140
Naturally complete mixing promotes the spontaneous redistribution of dissolved oxygen(DO), representing an ideal state for maintaining good water quality, and conducive to the biomineralization of organic matter. Water lifting aerators(WLAs) can extend the periods of complete mixing and increase the initial mixing temperature. To evaluate the influence of artificial-induced continuously mixing on dissolved organic matter(DOM) removal performance, the variations of DOM concentrations, optical cha... 相似文献
70.
To reveal clearly the effects of particle thermal characteristics on flame microstructures during organic dust explosions, three long-chain monobasic alcohols, solid at room temperature and similar in physical-chemical properties, were chosen to conduct experiments in a half-closed chamber. In the experiments, the dust materials were dispersed into the chamber by air to form dust clouds and the hybrids were ignited by an electrical spark. A high-speed optical schlieren system was used to record the flame propagation behaviors. A fine thermocouple and an ion current probe were respectively used to measure the flame temperature profile and the reaction behaviors of the combustion zone. Based on the experimental results, combustion behaviors and flame microstructures in dust clouds with different thermal characteristics were analyzed in detail. As a result, it was found that the dust flame surfaces were completely covered by cellular structures that significantly increased the flame frontal areas. Flame propagated more quickly and the number of the cellular cells increased as increasing the volatility of the particles. On the contrary, maximum temperature and the thickness of the preheated zone decreased as increasing the volatility of the particles. According to the ion current profile, the particles in the preheat zone were pyrolyzed to intermediate radicals and the radicals' fraction in the higher volatile dust flame was higher than that in the lower volatile dust flame. 相似文献