环境空气中二氧化氮的测定及问题研究

通过介绍环境空气中二氧化氮的测定方法──自动仪器监测法，对有关问题进行了初步探讨和研究，为正确使用该方法和仪器，确保监测工作的顺利进行提供了依据。     

汽车尾气和大气中C1—C4烃类分析方法研究

采用熔融性Ａｌ２Ｏ３／ＫＣｌ大孔径毛细管柱，用气相色谱直接进样方式，对汽车尾气中的低碳烃类化合物进行了分析监测。在汽车尾气中检出了３２个色谱峰，对其中的１０种烃类化合物进行了定量测定。浓度在２５μｇ／Ｌ－２０ｍｇ／Ｌ范围内与峰面积有良好的线性关系，方法的相对标准偏差小于１０％；样品的回收率为８５．０％－１１５．０％；最低检出浓度为２５μｇ／Ｌ。     

GC／MS法定量测定工业废水中半挥发性有机物

采用ＧＣ／ＭＳ方法定量测定工业废水中半挥发性有机物。研究了试样预富集方法，采用不同的预富集方法，对茶，二氢苊及苯并（ａ）芘等７种物质进行富集的结果表明，采用Ｎ２吹与Ｋ－Ｄ浓缩相结合的方法，优于其他方法，其回收率与美国ＥＰＡ－６２５方法的数据相近，回收率在９２％以上，研究了定量测定条件，以２，２′－二氟联苯为内标物质，测定不同浓度的半挥发性ＥＰＡ标准样品的响应因子Ｄ≤２５％。测定了上海焦化厂工业放心     

作业环境空气中醋酸异丁酯的气相色谱测定方法

根据国外卫生标准的要求，建立了作业环境空气中醋酸异丁酯的气相色谱分析测定方法．     

大气环境中二硫化碳分析方法的选择研究

应用气相色谱Ｎｉ＾６３电子捕获检测器，在用６２０１红色担体为基体，涂１０％ＯＶ－１０１固定液的玻璃柱上，以甲苯作吸收液，对空气中ＣＳ２进行定量检测，其最低检出浓度可达０．００５ｍｇ／ｍ＾３，方法精密度好，ＳＯ２和Ｈ２Ｓ等不干扰测定，经现场实际测试，能适用于大气环境中微量ＣＳ２的分析。     

气相色谱法分离测定工业废气中乙酸乙酯、异丙醇、甲苯的方法研究

研究了用气相色谱法分离测定工业废气中乙酸乙酯、异丙醇、甲苯含量，进行了各种色谱条件选择、精密度、样品回收率、方法检出限及样品稳定性实验．     

Landfill gas - a potential environmental hazard

Methane derived from the decomposition of organic material contained within a landfill may escape beyond the site boundary where it can pose an explosion or fire hazard. Methods are described to prevent die occurrence of such lateral gas migration. Problems due to the accumulation of gas in buildings, erected on landfill sites, have occurred and techniques are now available to overcome these at some sites. However, it is recognized that at other sites, redevelopment should not be allowed to take place on die grounds of safety.     

Large variability in ambient ozone sensitivity across 19 ethylenediurea-treated Chinese cultivars of soybean is driven by total ascorbate

The sensitivity of Chinese soybean cultivars to ambient ozone(O3) in the field is unknown,although soybean is a major staple food in China. Using ethylenediurea(EDU) as an O3 protectant, we tested the gas exchange, pigments, antioxidants and biomass of 19 cultivars exposed to 28 ppm·hr AOT40(accumulated O3 over an hourly concentration threshold of40 ppb) over the growing season at a field site in China. By comparing the average biomass with and without EDU, we estimated the cultivar-specific sensitivity to O3 and ranked the cultivars from very tolerant( 10% change) to highly sensitive( 45% change), which helps in choosing the best-suited cultivars for local cultivation. Higher lipid peroxidation and activity of the ascorbate peroxidase enzyme were major responses to O3 damage, which eventually translated into lower biomass production. The constitutional level of total ascorbate in the leaves was the most important parameter explaining O3 sensitivity among these cultivars. Surprisingly, the role of stomatal conductance was insignificant. These results will guide future breeding efforts towards more O3-tolerant cultivars in China, while strategies for implementing control measures of regional O3 pollution are being implemented. Overall, these results suggest that present ambient O3 pollution is a serious concern for soybean in China, which highlights the urgent need for policy-making actions to protect this critical staple food.     

Gas explosion analysis of safety gap effect on the innovating FLNG vessel with a cylindrical platform

After investigating gas dispersion on a cylindrical Floating Liquefied Natural Gas (FLNG) platform (Li et al, 2016), this second article focuses on assessment of gas explosion by using Computational Fluid Dynamics (CFD). Gas explosion simulations are carried out to evaluate the explosion overpressure mitigating effect of safety gap. The Data-dump technique, which is an effective tool in resetting turbulence length scale in gas explosion overpressure calculation, is applied to ensure simulation accuracy for the congestion scenario with safety gap. Two sets of different safety gaps are designed to investigate the safety gap on the cylindrical FLNG platform, the overall results indicate that the safety gap is effective in reducing overpressure in two adjacent congestions. However, for the explosion scenario where the flame is propagating through several safety gaps to the far field congestion, the safety gap mitigates overpressure only in certain explosion protecting targets. Two series of artificial configurations are modeled to further investigate the explosion scenarios with more than two safety gaps in one direction. It is concluded that the optimal safety gap design in overpressure mitigation for the cylindrical FLNG platform is to balance the safety gap distance ratio in the congested regions.