共查询到20条相似文献,搜索用时 78 毫秒
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利用大流量载气提高分析速度和灵敏度,采用GDX502作吸附剂,用氧火焰检测器检测空气中的乙烯,分析周期小于35秒,检测限为2.5×10~(-8)V/V,线性范围10~7。本方法简单、快速、准确,特别适用于分析环境风洞中的示踪剂乙烯。 相似文献
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气相色谱法测定空气中的三乙胺 总被引:1,自引:0,他引:1
1.前言目前国内对三乙胺的检测均采用比色法,由于其操作步骤繁杂、费时,因此,为了寻求一种简便、快速、准确的检测方法,我们用气相色谱法对空气中的三乙胺测定进行了研究。2.试验部分(1)仪器与试剂上海产102 G 型气相色谱仪;美国产103担体(Chromosorb),60—80目;自动平衡记录仪 XWC-100型,1毫伏(满量程);聚 相似文献
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ISO14000系列环境管理国际标准概述 总被引:1,自引:0,他引:1
概述了ISO14000系列环境管理国际标准的内容、分类、特点及其作用。介绍了企业实施该系列标准所应采取的步骤和措施。该系列标准由环境管理体系、环境行为评价、生命周期评估、环境管理、产品标准中的环境因素等系列组成,可指导企业表现正确的环境行为,提升企业的竞争力。 相似文献
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气相色谱法测定空气中的丙烯酸酯类物质 总被引:5,自引:0,他引:5
采用国产仪器和试剂,色谱法测定空气中丙烯酸酯类物质,方法的重复性好、灵敏度高、回收率达95%以上,三种丙烯酸酯类的标准曲线均具有良好的线性关系。 相似文献
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《矿山资源开发利用与环境保护》2002,(2):22-22
ISO14000环境管理系列标准是国际标准化组织(ISO)第207技术委员会(ISO/TC207)组织编制环境管理体系标准,其标准号从14001—14100,共100个标准号,统称为ISO14000系列标准。它顺应国际环境保护的发展,是依据国际经济与贸易发展的需要而制定的。 相似文献
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开发了新型空气流体振荡器用于曝气系统,将进入曝气器的稳定流变为振荡流,以标准氧总传质系数为指标,考察了曝气盘类型、振荡器反馈通道长度、空气流量等因素对曝气溶氧效率的影响,并通过Fluent软件模拟振荡器内部流场,分析振荡原理。结果表明,流体在振荡器内产生稳定附壁现象,控制端对流体的压力作用使其流向产生周期性切换,从而产生流体振荡效果。在振荡器反馈通道长度10.5 cm、空气流量10.0 L/min的条件下,相对于稳定流,三元乙丙橡胶(EPDM)微孔曝气盘振荡流可使标准氧总传质系数提升114.6%。振荡流通过增大气泡密度和减少气泡兼并行为来减小气泡尺寸,振荡流的气泡平均尺寸相较于稳定流降低了42.6%。 相似文献
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以顶空气相色谱法直接测定聚苯乙烯食品包装材料固体试样中的苯,甲本、对二甲苯和苯乙烯,最小检出量为10-10^10g,回收率为97.6%-102.5%。该法基体干扰小、操作简便。 相似文献
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ISO14001环境管理体系与火力发电企业的发展 总被引:2,自引:0,他引:2
介绍了ISO14000环境管理系列标准的核心-环境管理体系的主要内容,阐述了火力发电企业建立环境管理体系将有利于电力可持续发展,有利于节能降耗,减污增效,有利于提高企业的环境管理水平和整体管理水平,有利于树立企业全新的环境保护形象。 相似文献
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空气气提法处理含苯和氯苯的废水1前言苯和氯苯均为易挥发、难氧化、毒性大的有机化合物。目前,国内对含苯和氯苯废水的处理,技术上尚存在许多问题。我们在研究某化工厂对二氯苯生产废水的处理方法时,采用空气吹脱、活性炭吸附等措施,较好地解决了含苯和氯苯废水的处... 相似文献
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We simulated the long range transport of dust emitted from dust storms that occurred in China by using a global three-dimensional chemical transport model. A modified dust emission flux scheme and a nonlocal diffusion scheme for determining the atmospheric eddy diffusivity in the atmospheric boundary layer were implemented to improve the chemical transport model. We examined the dust transport by comparing the model results with TOMS satellite images. The model calculated monthly total deposition of dust masses were used for comparison with the measurements collected at sampling stations in Japan, and good agreement was found. The model generally reproduced the temporal and spatial variations of dust reasonably well. 相似文献
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采用便携式PM2.5采样器和玻璃纤维滤膜对大气粉尘进行采样,以加压液体萃取、超声波辅助提取和微波辅助提取3种方法对多环芳烃类化合物进行提取,以超高效液相色谱和质谱联用方法进行测定。共检测出16种多环芳烃类化合物,分别为:萘、苊、苊烯、芴、菲、蒽、荧蒽、芘、苯并[a]蒽、■、苯并[b]荧蒽、苯并[k]荧蒽、苯并[a]芘、二苯并[a,h]蒽、茚并[1,2,3-c,d]芘和苯并[g,h,i]苝。3种提取方法均可有效提取大气粉尘中的多环芳烃类化合物,加压液体萃取法的提取效率最高、超声波辅助提取法次之、微波辅助提取法最低。超高效液相色谱和质谱连用方法可有效地分析大气粉尘中的多环芳烃类化合物,线性方程的相关系数不低于0.998 3,测定值的相对标准偏差不超过0.80%,检出限不高于0.27 ng/g。 相似文献
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Trends in the Water Chemistry of High Altitude Lakes in Europe 总被引:2,自引:0,他引:2
Mosello R. Lami A. Marchetto A. Rogora M. Wathne B. Lien L. Catalan J. Camarero L. Ventura M. Psenner R. Koinig K. Thies H. Sommaruga-Wögrath S. Nickus U. Tait D. Thaler B. Barbieri A. Harriman R. 《Water, Air, & Soil Pollution: Focus》2002,2(2):75-89
Here we present the chemical trends of seven high altitude lakes, analysed within the AL:PE and MOLAR Projects of the EU (1999) and selected on the basis of the availability of complete and reliable data for the period 1984–1999. The lakes are representative of the Scandinavian Alps, the Cairngorm Mountains in Scotland, the Alps and the Pyrenees. Significant trends were identified for some indicators of acidification, for instance pH and alkalinity, but not all lakes reacted similarly to decreasing depositions of sulphate and base cations. Differences in lake response are discussed in relation to recent variations of atmospheric deposition chemistry and associated changes in climatic conditions. Beside individual variations of the studied lakes, depending, among other things, on altitude and morphology, catchment characteristics and climate trends play a major role for the reaction of high altitude lakes on changes in atmospheric depositions. 相似文献
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Takahashi Akira Fukuda Keisuke Tsuji Kiyoshi Yoshikawa Kunio 《Water, Air, & Soil Pollution: Focus》2003,3(5-6):79-88
To evaluate the influence of anthropogenic emission of HCl on the air quality in the Kanto district of Japan, the atmospheric budgetof non-seasalt Cl (nssCl) was analyzed. The Kanto district, which consists of the Tokyo metropolis and the six surrounding prefectures, is the most densely populated region in Japan. The emission intensity of HCl is extremely high compared with those in other regions and most western countries. In this study, the annual wet and dry depositions of nssClwere estimated on a 0.25 × 0.25° grid over the Kanto district based on the concentration monitoring resultsand meteorological data. The budget analysis was conducted by comparing the estimated deposition with the emission of HCl. As a result, the annual total (wet + dry) deposition of nssCl was estimated to be 32 kt yr-1, which closely agreed with HCl emission (36 kt yr-1) from waste incineration in this area. The result suggested that the anthropogenic emission of HCl had a significant influence on the air quality and the deposition of acidity in this area. 相似文献