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41.
用二氯甲烷萃取水中的甲萘威和阿特拉津,经旋转蒸发和氮吹富集浓缩后,采用高效液相色谱二极管阵列检测器在222 nm波长下测定。甲萘威和阿特拉津在0.100 mg/L~5.00 mg/L范围内线性良好,检出限分别为0.031 μg/L和0.027 μg/L,空白水样加标平均回收率为78.5%~91.7%,平行测定3次的RSD<5%。 相似文献
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The paper presents the results of the validation of the developed pool evaporation model using literature and our own experimental data. The proposed model was used to examine the effect of wind velocity and pool sizes on the evaporation rate of volatile liquid (hexane). Contrary to the semi-empirical evaporation model widely used in hazard assessment, stronger dependence of evaporation rate on pool size at low wind speeds is obtained. 相似文献
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This study investigated a 2010 fire and explosion that occurred at a polypropylene (PP) and copper-clad laminate high-tech plant in Taiwan. Liquid acetone leakage caused the fire and explosion. One person was killed and five were injured; property damage was estimated at US$20 million. In contrast to conventional plants, high-tech plants have sophisticated instrumentation, highly complex pipelines, and confined spaces. In addition, the floor area in a high-tech plant is large and frequently contains a channel through the ground floor to the second or third floor. This channel design enables the fire compartment to be destroyed. Therefore, the system cannot confine the fire to a specific area, thus hindering fire-relief operations. In this study, the original fire outbreak occurred in the PP processing area on the ground floor. The acetone storage tank was located on the third floor. The investigation conducted at the fire site of the situations of the burning (bursting) loss determined that the acetone liquid leaked and dripped from floor cracks and tunnel oven to the PP processing area. Because the PP manufacturing process rapidly generates static electricity, the flammable liquids made contact with the source of ignition, which caused the explosion and fire. Various procedures, such as those involving the operating environment of production, packaging, and processing in a high-tech plant, are likely to produce static electricity in a workplace. Improved electrostatic management can prevent the loss of property and lives, liquid acetone leakage, and loss of equipment caused by static electricity fire. 相似文献
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API standard 521 guidance on mixing of hot/cold liquids and prevention of superheat limit explosions
American Petroleum Institute (API) standards and recommended practices have identified inadvertent mixing of hot and cold liquids as a potential cause for equipment overpressure since 1955. The limited guidance has been informative but provides minimal if any details on conditions that could cause an overpressure and its potential severity. Therefore, the user must interpret how and when to prevent and/or mitigate the scenario. This guidance has changed little over the years. In June 2020, API published the 7th Edition of API Standard 521 which now provides specific guidance as to conditions whereby pressure relief devices can be considered for protection and conditions where prevention remains as the only recourse. This paper discusses the basis for the revised guidance in API Standard 521 and includes supplemental guidance. 相似文献
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经反复多次试验,证明了用硫酸亚铁废酸液还原处理铬废液的可行性,此法以废治废,工艺简单,操作容易,处理效果好. 相似文献
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载体催化剂在许多有机反应中已证明可作为对环境有利的催化剂而取代传统催化剂(一般有腐蚀性,毒性或极难分解和重整并产生大量废物)。综述了近年来固体酸催化、固体碱催化剂和其它载体催化剂的特性及液相有机化学反应中的应用成果,催化机理及发展趋势。 相似文献
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