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131.
Methyl ethyl ketone (MEK) oxidation via H2O2 with tungsten-based polyoxometalate catalysts has gained much attention with an ever-growing body of knowledge focusing on the development of environmentally benign processes in chemical industry. In this study, two calorimetry techniques, differential scanning calorimetry (DSC) and Phi-TEC II adiabatic calorimetry, were employed to analyze the thermal hazards associated with the 2-butanol oxidation reaction system. Hydrogen peroxide was the oxidant and a tungsten-based polyoxometalate as the catalyst. Gas chromatography-mass spectrometry was used for identification of the organic products. Important thermal kinetic data were obtained including “onset” temperature, heat of reaction, adiabatic temperature rise and self-heat rate. From DSC results, three exothermic peaks were detected with a total heat generation of approximately 1.26 kJ/g sufficiently to induce a thermal runaway. Possible reaction pathway for three stages were proposed based on both DSC and GC-MS results. One exotherm was detected by Phi-TEC II calorimeter and the pressure versus temperature profile together with the DSC and GC-MS data demonstrate the complexity of 2-butanol reaction system under both thermal screening and adiabatic conditions. 相似文献
132.
Nan Fang Zhou Lu Zhongbei Zhang Zhiguang Hou Shuang Liang Bo Wang 《Journal of environmental science and health. Part. B》2020,55(6):566-573
AbstractTomatoes have been widely planted in greenhouses and fields in China. Soil-borne diseases are more harmful to tomatoes than other types of diseases. Dimethyl disulfide (DMDS) was used as a novel fumigant instead of methyl bromide to control soil-borne diseases. To assess the safety of DMDS for use on tomatoes, its dissipation and terminal residues were investigated at three different locations under greenhouse and open field conditions. The QuEChERS method was simplified using gas chromatography with mass spectrometry detection and combined with liquid-liquid extraction purification to allow determination of DMDS levels in both the tomatoes and the soil. The average recovery of the method was between 85.3 and 98.6%, with the relative standard deviation (RSD) ranging from to 1.9–10.3%. The dissipation and terminal residues of DMDS in the tomatoes and the soil were analyzed using the method, the results of which showed that the half-life of DMDS ranged from 0.3–6.5 d in the soil at three different locations. The terminal residues of DMDS in the tomatoes and the soil were not detected. This study provided data that the Chinese government can use to support appropriate and safe guidance for the use of DMDS on agriculture. 相似文献
133.
建立了在突发性水污染事故中定量分析水样中甲醇、丙酮、乙腈、N,N-二甲基甲酰胺和N,N-二甲基乙酰胺等5种极性有机物的实验室和现场应急监测分析方法。采用顶空-车载气相色谱质谱法用于现场快速定性定量分析;顶空-气相色谱法用于实验室准确定量分析。通过优化顶空及气相参数,在最佳实验条件下测得顶空-气相色谱质谱法中甲醇、丙酮、乙腈、N,N-二甲基甲酰胺、N,N-二甲基乙酰胺等5种化合物的检出限分别为1.0、0.06、0.5、10.0、15.0 mg/L,平行测定7次结果的相对标准偏差分别为2.1%~3.8%,加标回收率为69.4%~104%;顶空-气相色谱法灵敏度高于气相色谱质谱法,检出限分别为0.08、0.01、0.03、1.7、1.7 mg/L,平行测定7次结果的相对标准偏差分别为2.5%~4.1%,加标回收率为78.1%~116%。 相似文献
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固定污染源中苯系物的便携式气质联用检测方法研究 总被引:1,自引:0,他引:1
建立了适用于固定污染源气体中苯系物的日常检测和监督性检测的便携式气质联用分析方法。利用Mars-400便携式GC-MS具有定量环和吸附管同时并存的功能,无需更换仪器部件,根据预测浓度,选择相应的进样模式(10mg/m3为浓度切换点),以保留时间和特征离子定性,总离子峰面积定量,现场对固定污染源中高低浓度苯系物进行直接分析。在吸附管和定量环两种模式下,选择苯系物的质量浓度范围分别为0.1~10 mg/m3、5~100 mg/m3,两者的线性相关系数均≥0.993,相对标准偏差(n=7)为5%~14%,方法回收率在84%~112%之间。 相似文献
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基于GC-MS方法的焦化行业特征挥发性有机物分析 总被引:1,自引:0,他引:1
基于气相色谱-质谱联用(GC-MS)方法,对南京市2家钢铁企业焦化工艺的挥发性有机物(VOCs)无组织排放情况开展监测。结果表明:焦化行业排放的VOCs主要组分为苯系物、含氧化合物、卤代烃、烷烃和烯烃,分别约占33%、24%、16%、13%和13%,炔烃约占1%;主要特征污染物包括苯、甲苯、二甲苯、甲醇、乙醛、丙酮、氯乙烯、二氯乙烯、三氯苯等。 相似文献
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