共查询到19条相似文献,搜索用时 62 毫秒
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GC/MS方法测定地下水中挥发性有机化合物 总被引:6,自引:0,他引:6
利用气相色谱—质谱联用技术,对化工厂附近井水中可能存在的挥发性有机化合物进行了定性和定量分析。对试样的存放时间和吹扫捕集试验条件进行了优化,采用自动进样吹扫捕集方法进行测定,得到满意结果。 相似文献
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室内空气中挥发性有机化合物污染及检测方法 总被引:8,自引:0,他引:8
室内空气中挥发性有机污染物的释放严重影响了室内空气质量,本文较详细的叙述了这些有机污染物的来源、种类及处理方法等,并对空气中VOCs的采集和检测方法作以介绍,阐述了不同机制的热解吸仪与气相色谱联用时的优缺点及其应用. 相似文献
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水性涂料中挥发性有机化合物的气相色谱-质谱法测定 总被引:4,自引:1,他引:4
建立了内墙涂料中24种挥发性有机化合物(VOCs)的GC-MS检测方法,重点研究了现有检测方法分离度差和回收率低的问题,采用无水硫酸钠净化、二氯甲烷超声和膜过滤提取体系,改善了各种化合物的回收率,特别是提高了二元醇类化合物的回收率,优化后的实验条件下,样品的加标回收率为70%~94%,相对标准偏差不大于6.8%,检出限为3.1~10.6 mg/L。在30~300 mg/L范围内,方法的线性关系良好,相关系数大于0.99。该方法简便、快速、灵敏、精密度好,完全满足进出口水性涂料中常见的24种挥发性有机化合物的检测要求。 相似文献
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呼出气检测作为一种潜在的新型临床检测手段受到广泛关注。本文详细综述了人体呼出气中挥发性有机化合物(VOCs)的各类检测方法和技术,分别对色谱法、质谱法和光谱及传感器法的原理、特点和最新研究进展进行了介绍,对照总结了目前已确定的异戊二烯、丙酮等疾病生物标志物的各种分析方法和实测数据,并展望了未来的研究动向。 相似文献
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用直接进样、固相萃取进样和自制的固相微萃取(SPME)装置进样与气相色谱(GC)及GC—MS联用检测了室内空气中的挥发性有机污染物,对影响SPME操作条件进行了优化。使用的方法在所测范围内具有良好的线性(相关系数为0.968~0.991),检出限达0.3—2、3μg/L,相对标准偏差均小于7%,回收牢为95%~111%。结果表明:自制的SPME装置操作简单、快速、安全,准确度、灵敏度优于其它两种方法。 相似文献
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以氨基酚醛树脂球作模板,通过一种简单的模板法制备了具有中空微球(HMS)结构的二氧化锡;将其涂覆于氧化铝陶瓷管金电极表面,制得一种新型薄膜式硫化氢传感器.采用X射线衍射(XRD)及透射电子显微镜(TEM)表征了材料的微观结构和形貌,并考察了二氧化锡中空微球(Sn O2HMS)的气敏性能.结果表明,二氧化锡中空微球对硫化氢气体表现出良好的气敏特性.在最佳工作温度(200℃)下,所制作的传感器对142.6 mg/m3硫化氢的响应值高达97.13%,响应时间为22 s.该传感器对硫化氢的响应线性范围为0.2852~142.6 mg/m3,相关系数为0.9931,检出限达到0.1549 mg/m3,且几乎不受环境湿度和温度的影响,具有良好的重现性和选择性.对养殖场中硫化氢气体连续监测10个月后,传感器响应信号衰减了5.4%,表明该传感器具有长期稳定的使用寿命,可实现远程监测的实际应用. 相似文献
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A sensitive optical waveguide(OWG) sensor which can be used to detect volatile organic compounds(VOCs) was presented. The sensing device(element) was fabricated by means of the immobilization of polyvinyl pyrrolidone(PVP)-cyclodextrin(CD) composite film over a single-mode potassium ion exchanged glass OWG via spin-coating method. The sensor shows higher response to styrene gas than to other VOCs and displays a linear response to styrene gas in a range of 1-1000 μL/L. 相似文献
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以Tenax-TA、Carboxen 1000和Carbosieve SⅢ为采样管填充料,将植物源挥发性有机物吸附于采样管内,样品通过二次热解吸仪解吸后,随载气进入气相色谱仪,采用氢火焰离子化检测器(FID)测定,建立了利用二次热解吸仪与气相色谱联用技术测定植物挥发性有机物的分析方法。载气N2流速为30 mL/min,60℃下吹扫吸附管2 min,然后在250℃下解吸吸附管5 min,冷却1 min后,在275℃下解吸聚焦管3 min,样品经传输线进入气相色谱。气相色谱载气N2压力为190 kPa,FID检测器温度280℃;进样口温度225℃;初始柱温40℃,停留5 min,以2℃/min升温至120℃,保留1 min,然后以20℃/min升温至200℃,保留10 min。方法重现性好,精密度高,线性相关系数大于0.99;检出限均低于9×10-9g/L;解吸效率大于96%,适用于植物源挥发性有机物的测定。 相似文献
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使用TVOC混合标准溶液对气相色谱法检测室内空气样品中总挥发有机物的方法进行了探索。改进后的色谱分析时间为26.1min,比GB/T 18883-2002方法(52min)缩短了25.9min,TVOC各物质峰分离度高于99%,检测精密度相对标准偏差在1.05%至2.89%之间,回收率在95%到102%之间,检出限为0.020μg。 相似文献
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大气环境中挥发性有机化合物的测定 总被引:8,自引:0,他引:8
参考美国环保局大气中挥发性有机化合物 (VOCs)的标准分析方法TO14A和TO15 ,采用预浓缩器与气相色谱联用 ,以质谱或氢火焰离子化检测器检测 ,建立了 5 6种VOCs(主要是臭氧前体物 )的快速分析方法。该方法在同一台仪器上采用单柱、单检测器 ,准确测定了高浓度CO2 下的VOCs。方法检出限为 0 1μg·m-3 ,相对标准偏差(RSD)为 2 5 7%~ 9 82 %。用该法分析了实际大气样品中的VOCs,结果令人满意。 相似文献
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Barbara Hauser Peter Popp Albrecht Paschke 《International journal of environmental analytical chemistry》2013,93(1-4):107-121
Abstract The field of application of a mobile gas chromatographic device (Airmobtx monitor HC 1000 manufactured by Airmotec GmbH) originally conceived for the analysis of BTEX in air was extended to water analysis by using it in conjunction with membrane extraction. Volatile organic compounds diffuse out of water through a hollow fibre or flat membrane, are enriched onto sorption tubes integrated in the device, and then thermally desorbed and analysed by the gas chromatograph/flame ionisation detector. The suitability of various flat membranes and hollow fibres was investigated. Maximum extraction efficiency was obtained with a silicone hollow fibre measuring 0.3 m long, and with an inner diameter of 0.7 mm and a wall thickness of 100 μm. The extraction parameters were optimised. The linear dynamic range of the optimised method spans two orders of magnitude and the detection limits were found to be 0.1 μg/L for all BTEX compounds. By way of environmental applications, highly contaminated groundwater samples were analysed. The results correspond well to those achieved using conventional headspace/gas chromatography/flame ionisation detection. 相似文献
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Introduction The design of new solid-state sensor materials that can selectively adsorb volatile organic compounds (VOC) and produce measurable color and/or lumines-cence changes is of potential significance in the sense of environmental and public safety control.1-5 The use of metal complexes as optical sensors for VOC detection has been reported, and most of them are based on the susceptibility of metal-to-ligand charge transfer (MLCT) and/or metal-metal-to-ligand charge transfer (MMLC… 相似文献
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《Analytical letters》2012,45(13):2048-2059
A simple and rapid discrimination of four lung cancer related volatile organic compounds (VOCs) was achieved with a novel colorimetric sensor array. Based on the cross-responsive mechanism, the sensor system exhibited high sensitivity to selected lung cancer biomarkers, including p-xylene, styrene, isoprene, and hexanal with concentrations varying from 50 ppb to 500 ppb. By extracting color information, it provided good selectivity and fine discrimination of selected gases via pattern recognition with Fisher linear discriminant (FLD). Additionally, with the employment of the Takagi-Sogeno Fuzzy Neural Network (TSFNN), different concentrations of selected VOCs were discriminated. It also suggested that the colorimetric sensor array proposed could not only distinguish different lung cancer related VOCs but also discriminate specific VOCs of different concentrations with an average rate of classification up to 95%. Our preliminary study demonstrated that the cross-responsive sensor array had infinite potential for further clinical and commercial use for early diagnosis of lung cancer. 相似文献
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采用顶空固相微萃取–气相色谱–质谱联用法测定絮用纤维中甲苯、乙烯基环己烯、1,3-丁二烯等29种常见有机挥发物的含量。样品在120℃平衡20 min,然后固相微萃取30 min,在250℃的进样口温度下解吸10min。29种有机挥发物在检测范围内均有良好的线性,线性相关系数r≥0.99,检出限为0.000 5~0.016 mg/m~2。3个添加标水平下平均加标回收率为88.4%~113.4%,测量结果的相对标准偏差小于11%(n=6)。方法快速、灵敏,适用于絮用纤维中有机挥发物快速检测。 相似文献