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Yuchen Gao Jianguo Jiang Yuan Meng Tongyao Ju Siyu Han 《Frontiers of Environmental Science & Engineering》2023,17(3):32
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硫化物是水质检测的一个重要参数,因其对水生生物和人体具有很高的毒性而备受关注.综述了近5 a来环境水样中硫化物的分析方法研究进展,包括光谱法(分光光度法、荧光法、电致化学发光法、电感耦合等离子体-原子发射光谱、原子吸收法、流动注射法),色谱法,以及电化学法(阴极溶出伏安法、阳极溶出伏安法、电催化氧化法、生物传感器法),... 相似文献
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Yang Li Yixin Zhang Guangshen Xia Juhong Zhan Gang Yu Yujue Wang 《Frontiers of Environmental Science & Engineering》2021,15(1):1
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This paper presents data on the limiting (minimum) concentrations of hydrogen in oxygen, in the presence of added helium, at elevated temperature and pressure related to the practical operational case. A 5 L explosion vessel, an ignition sub-system and a transient pressure measurement sub-system were used. Through a series of experiments carried out using this system, the limiting concentrations of hydrogen in oxygen and helium at different initial pressures and temperatures for the practical operational case were studied, and the influence of ignition energy and initial temperature on the limiting concentration of hydrogen in oxygen and helium was analyzed and discussed. The variation of ignition energy within the studied range is found to have a significant effect on the limiting concentration of hydrogen in oxygen and helium at lower initial temperature. However, when the ignition energy is higher than 32 mJ, the limiting hydrogen concentration remains almost changeless as the initial temperature increases from 21 °C to 90 °C. The limiting explosible concentration of hydrogen–oxygen–helium mixture decreases as the ignition energy increases when the initial temperature is lower. When the initial temperature is higher, the ignition energy has little effect on the limiting hydrogen concentration of hydrogen–oxygen–helium mixtures. When the initial temperature reaches 90 °C, the limiting hydrogen concentration remains almost changeless with an increase in ignition energy. The limiting explosible concentration of hydrogen in the mixtures, at the initial temperature of 21 °C and the ignition energy of 0.5 mJ, is 8.5% and that of oxygen is 11.25%. 相似文献
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Many substances react with water in such a way that flammable gases are formed. For transport issues this reaction may possess a considerable hazard especially if the cargo is wetted by rain or by water from other sources. In the UN Recommendations on the Transport of Dangerous Goods these kinds of problems are addressed. The UN test N.5 “Test method for substances which in contact with water emit flammable gases” corresponds to this hazard. Classification according to the test method is done by measurement of the gas evolution rate of the flammable gas by any suitable procedure. At BAM a gravimetric approach is used to measure the gas evolution rate. In this paper we present the evaluation of the apparatus by means of an absolute calibration routine utilizing a reaction where a known amount of gas is produced as well as the evaluation of important parameters influencing the gas evolution rate using different substances. It can be shown that the apparatus is capable of measuring absolute gas volumes as low as 6 mL with an acceptable error of about 17% as determined from the reaction of Mg with demineralized water. 相似文献
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《Process Safety and Environmental Protection》2014,92(1):70-79
The increase in GHG concentration has a direct effect on global climate conditions. Among the possible technologies to mitigate GHG emissions, CCS is being accepted to gain emission reduction. Such technology also involves cryogenic CO2 capture processes based on CO2 freeze-out or where the formation of solid CO2 must be avoided. Captured CO2 is usually transported in pipelines for the reinjection.The risk associated to the release of CO2 is due to the changing temperatures and pressures the system may experience, which can lead to the deposition of solid CO2 where it must be avoided. Prolonged exposure to dry ice can cause severe skin damage and its resublimation could pose a danger of hypercapnia. It is, thus, necessary to build up a tool able to predict the conditions in which CO2 can freeze-out.A thermodynamic methodology based on cubic EoSs has been developed which is able to predict solid–liquid–vapor equilibrium of CO2 mixtures with n-alkanes or H2S which are usually found in equipment for acidic gas, mainly natural gas, treatment.The focus is a detailed analysis of the method performances when more than two components are present since, for such a case, literature does not provide significant modeling results. 相似文献