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151.
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
152.
153.
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
154.
155.
环境样品中三种新型溴代阻燃剂的分析测定 总被引:1,自引:0,他引:1
采用索氏抽提、多层硅胶氧化铝柱分离净化和气相色谱质谱联用仪(GC-EI-MS和GC-ECNI-MS)分别对沉积物及土壤样品中的十溴二苯基乙烷(DBDPE),四溴舣酚A双(2,3-二溴烯丙基)醚(TBBPA-DB-PE),1,2-双(2,4,6-三溴苯氧基)乙烷(BTBPE)3种新型溴代阻燃剂进行了定性和定量分析,并建立了环境样品中这3种新型溴代阻燃剂的检测方法.在3个流程空白中,所有目标物都低于检出限;加标空白中日标化合物DBDPE,TBBPA-DBPE,BTBPE的回收率分别为74.8%-82.5%,88.9%-100.7%,86.7%-102.3%.方法检出限分别为1ng·g~(-1),0.4ng·g~(-1)和0.1ng·g~(-1).DBDPE,TBBPA-DBPE,BTBPE在沉积物和土壤样品中测定结果的相对标准偏差分别为16.29%,0.045%,0.051%.方法具有较低的方法检出限,较好的回收率和重复性,适用于一般环境样品中新型溴代阻燃剂的分析和检测. 相似文献
156.
沈阳市烹饪油烟中VOCs排放特征分析 总被引:2,自引:0,他引:2
烹饪油烟中挥发性有机物VOCs的大量排放会影响室内外空气质量。采用预浓缩GC-MS方法分析了VOCs的组成,其主要成分是饱和烷烃(40.0%)、烯烃(10.4%),总VOCs平均质量浓度为3407.06±889.5μg·m-3。前18位物种加和结果显示,VOCs的化学活性为等效丙烯浓度622.5ug·m-3。VOCs排放因子为5.03g·kg-1;沈阳市2007年烹饪共排放VOCs 994.5t。 相似文献
157.
肝素提取废水的GC-MS分析和处理研究 总被引:1,自引:0,他引:1
肝素钠废水含有高浓度无机盐和大量有机污染物,对环境具有潜在的毒性且难以处理,已经受到环境工作者的关注。为了了解废水的主要成分和处理此类废水,本实验用GC-MS对废水进行了分析,并且利用芬顿试剂对其进行了处理,结果发现废水中有机物有26种,其中脂肪酸和芳香衍生物占有较大比例,处理后,有机成分只有3种;讨论了影响处理效果的因素和最佳的工艺条件,发现当pH 值为6.66,硫酸亚铁和过氧化氢的量分别为2.5 g/L和2.8‰ (v/v),搅拌速度为2 000 r/min, 搅拌时间为15 min时,COD的去除率可达到94.50%。 相似文献
158.
Haifeng Zhang Klaus Guenther Sebastian Zuehlke 《Environmental pollution (Barking, Essex : 1987)》2009,157(6):1904-1910
The degradation of a chiral nonylphenol isomer, 4-(1-ethyl-1,4-dimethylpentyl)phenol (NP112), in two agricultural soils from Monheim and Dortmund, Germany has been studied. The degradation of NP112 and the formation of a nitro-nonylphenol metabolite were determined by means of GC-MS analysis. The degradation followed bi-exponential order kinetics, with half-life of less than 5 days in both soils. The nitro-metabolite was found at different concentration levels in the two soils. The nitro-metabolite of NP112 was more persistent than its parent compound. After 150 days about 13% of the initially applied NP112 remained in the Monheim soil as its nitro-metabolite. Results of the E-screen assay revealed that the nitro-NP112 has oestrogenic potency of 85% of that of NP112. Furthermore, the results of chiral GC-MS analysis revealed that no chiral degradation of NP112 occurred in this study. 相似文献
159.
Understanding adsorption processes of butyltins (BTs) such as monobutyltin (MBT) and dibutyltin (DBT) by black carbons is important for the evaluation of BT exposure risks to organisms and humans. However, relevant knowledge is scarce. In this study, the acidity constants pKa,1 = 2.3, pKa,2 = 3.5 and pKa,3 = 5.9 for MBT and pKa,1 = 3.0 and pKa,2 = 5.1 for DBT are estimated via potentiometric titration. Additionally, adsorption isotherms of BTs to a wheat charcoal were determined. The adsorption behavior was observed to be pH-dependent due to BT speciation and the pH-dependent surface charge of the charcoal. MBT adsorption to the charcoal decreases with increasing pH from 4 to 8, while the highest adsorption occurs at pH 6 for DBT. Adsorption of the BTs is successfully described in the pH range of 3-10 by using a newly developed pH-dependent Dual Langmuir model. The model has the potential to predict the interaction of BT species with charcoal, which can contribute to the risk assessments of BTs in the environment. 相似文献
160.
Srimurali Sampath Govindaraj Shanmugam Krishna Kumar Selvaraj 《Environmental Forensics》2015,16(1):76-87
This study analyzed the seasonal distribution and the possible sources of polycyclic aromatic hydrocarbons (PAHs) in the atmospheric environment of Tamil Nadu, India. Passive air sampling was performed at 32 locations during the period from April 2009 to January 2010, and PAHs were quantified using a gas chromatograph-mass spectrometer. Analysis showed that the concentrations of PAHs were in the range of 5–47.5 ng/m3 with uniform distribution in urban areas in all seasons. Pre-monsoon season showed the highest cumulative concentration of PAHs in both agricultural and coastal areas. Among PAHs, phenanthrene, fluoranthene, and pyrene levels were found to be predominant in all the samples, contributing up to 36%, 35.5%, and 24.5% of total PAHs, respectively. The signature of the PAHs obtained through diagnostic ratio and principal component analysis revealed that diesel emissions was the probable source of PAHs in all locations. Based on Word Health Organization guidelines, the human lung cancer risk due to observed level of PAH concentration (i.e., PAHs exposure) is meager. However, the risk is predicted to be more in the coastal area during summer (18 individuals among 0.1 million people). To the knowledge of these authors, this report is the first on the seasonal analysis of PAHs using passive air sampling in India. 相似文献