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排序方式: 共有373条查询结果,搜索用时 24 毫秒
1.
采用火焰原子吸收分光光度法测定鱼内脏及河流底泥中的铜。鱼内脏经组织捣碎机捣成匀浆后,加硝酸消解;底泥则经氢氟酸和高氯酸消化。该方法具有灵敏度高,精密度和回收率较好等特点。 相似文献
2.
煤烟型大气污染解决方法 总被引:3,自引:0,他引:3
重点介绍了新型燃煤工艺——水平火焰无烟工业炉及其特点,并提出排烟尾气处理的资源化方案。 相似文献
3.
水中微量铝的间接原子吸收法测定 总被引:2,自引:0,他引:2
在HAc-NaAc缓冲溶液(pH4.5)体系中,利用(1-(2-萘酚(PAN),Al^3^+与Cu^2^+-EDTA发生定量交换反应,用氯仿萃取出Cu^2^+-PAN,用原子吸收法测定水中的Cu^2^+,以间接测定AL^3^+。方法的最佳线性范围为0.1-1.0mg/L,最低检出浓度为0.1mg/L;测定河水,饮用水,地下水中的Al^3^+,其回收率在85.0%-109%之间,变异系数为1.5%- 相似文献
4.
根据油气集输泵站稳定压缩机泵房噪声污染的现状,提出了采用空间吸声体降低噪声和采用田声降低噪声的技术方案,分析了实施后的效果和推广应用前景。 相似文献
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Portable Fuel Containers (PFCs) made for consumer use can, under unusual circumstances, develop a flammable atmosphere in the container headspace. In order to prevent an inadvertent ignition from causing flame propagation into this headspace and a subsequent explosion or flame jetting, PFC manufacturers are developing prototype Flame Mitigation Devices (FMDs) for installation in the PFC. A test method is described in this paper to determine if the installed FMD will indeed prevent flame entry into the PFC in a high-challenge flame propagation scenario. The method entails the use of a butane-air mixture ignited in a 5 cm diameter, 12 cm long tube attached to either the container neck or a spout on the container neck. Two concept FMD designs have successfully prevented repeated attempts at flame propagation into the PFC and have also produced encouraging results in tests for fuel flow restriction, duel dispensing nozzle friction, and prolonged fuel exposure. Versions of these tests are currently being promulgated in a draft ASTM standard on PFC FMDs. 相似文献
7.
The inhibition effect of heptafluoropropane (CF3CHFCF3) on methane explosions under different inhibitor concentrations in a closed vessel was studied. A high-speed camera and a pressure sensor were adopted respectively to record flame propagation characteristics and pressure data. Results indicate that the relationship between flame propagation and pressure rising was correlated. As the equivalent ratio (ϕ)≤1, the pressure presented a trend of rising firstly and then decreasing with increasing CF3CHFCF3 concentration, and it was found that there existed a critical concentration for pressure decrease. As ϕ > 1, the pressure exhibited a decreasing trend. Although the pressure appeared to seemingly increase, the moment that the pressure began to rise (trise) and the moment that the maximum explosion overpressure appeared (tPmax) were obviously delayed. The average rate of pressure rise ((dP/dt)ave) was decreased as the concentration of CF3CHFCF3 increased. It indicates that CF3CHFCF3 can effectively reduce the explosion reaction rate. The critical concentration of CF3CHFCF3 for complete inhibition was determined. Meanwhile, the synergy of CF3CHFCF3-inert gas can improve the inhibition effect. Compared with CF3CHFCF3–N2, the synergy of CF3CHFCF3–CO2 presented a better inhibition effect, and the inhibition effect was increased with increasing inert gas concentration. And the mechanisms of physical and chemical effects on explosion inhibition were analyzed. 相似文献
8.
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
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