搜索结果: 1-15 共查到“分析化学 GC”相关记录85条 . 查询时间(0.046 秒)
2023年8月20日，中国科学院合肥物质院健康所采用顶空固相微萃取气相色谱质谱（HS-SPME-GC-MS）非靶向分析方法，检测大鼠器官挥发性有机物（VOCs），获得了相关器官代谢VOCs生物信息。研究结果被遴选为正封面文章发表在分析领域TOP期刊Analytical Chemistry上（图1）。
动物组织样品油脂含量大、干扰杂质多，对其中低含量有机氯农药及多氯联苯的分析会造成较大程度的影响。针对动物组织样品基质复杂的特点，本文以二氯甲烷-丙酮（体积比为1：1）的溶剂体系，采用加速溶剂萃取技术对样品进行提取，在提取过程中尽量减少脂肪的共提出，然后采用凝胶渗透色谱技术去除样品中的大部分油脂，再结合弗罗里硅土为填料的固相萃取方法对样品进一步净化，能够达到充分去除油脂和小分子杂质的目的。采用气相色...
为了研究钯催化的2,4-二甲氧基苯甲酸与烯丙基丙二酸二乙酯的脱羧Heck反应的产物结构，建立了（2,4-二甲氧基苯基）烯丙基丙二酸二乙酯同分异构体的分离与鉴定的气相色谱-离子阱质谱方法。首先通过脱羧Heck反应制得（2,4-二甲氧基苯基）烯丙基丙二酸二乙酯异构体混合物，然后利用GC/MS联用技术对混合物进行分析，得到各组分的EI和CI全扫描模式质谱信息。通过对照各组分的分子离子峰确定互为异构体的组...
为了准确分析挥发性酮、醇、酯、腈类化合物在废水中的残留情况，建立了顶空-气相色谱-质谱法测定废水中16种挥发性酮、醇、酯、腈类化合物的方法，选用DB-624（30 m×0.32 mm×1.8 μm）毛细管柱，在柱流速1.5 mL/min条件下，采用电子轰击电离源，全扫描定性，选择离子进行外标法定量。结果表明16种化合物线性良好，相关系数r>0.995。当废水取样量为10.0 L时，方法检出限为0....
Determination of Fatty Acids in Human Sweat during Fasting Using GC/MS
Determination Fatty Acids Human Sweat during Fasting GC/MS
2010/9/15
Fatty acids (FAs) are biological molecules that are used as major metabolic fuels, and are concerned in important metabolic processes. We have performed a non-invasive and technically rapid and simple...
持久性有机污染物(POPs)3-硝基苯并蒽酮（3-NBA）是一种极强的直接致突变和致癌物,多种动物试验以及人体细胞试验证明其具有极强的致突变能力。环境中的3-NBA主要来源于机动车尾气和大气光氧化反应，其在大气中浓度远低于多环芳烃。利用高效液相色谱（HPLC）法，分离、富集目标组分，再结合气相色谱质谱（GC/MS）技术，可建立大气中3硝基苯并蒽酮的检测方法，仪器检测限为13.7pg，方法检测限...
Determining the Henry’s Law Constants of THMs in Seawater by Means of Purge-and-Trap Gas Chromatography (PT-GC): The Influence of Seawater as Sample Matrix
Law Constants Seawater Means Purge-and-Trap Gas Chromatography Sample Matrix
2010/9/13
The influence of seawater salts as salting out agents on the purge-and-trap gas chromatography (PT-GC) determination of trihalomethanes (THMs) was studied. This is particularly important since seawate...
大气颗粒物中有机组分污染特征的研究，对我国城市空气质量监控与治理有重要意义。应用中流量PM2.5采样器采集2003年9月~2004年7月北京市大气颗粒物样品，建立了同时测定PM2.5中三类有机组分的实验方法。采用14%BF3/CH3OH溶液为有机酸衍生化试剂，并确定有机酸最佳衍生化反应温度和时间分别为40℃、45min；采用自填SPE硅胶柱，实现了正构烷烃、多环芳烃和有机酸酯的完全分离，三类组分回...
采用酸性溶剂萃取卷烟主流烟气剑桥滤片捕集物,目标分析物经固相萃取小柱分离富集后,应用气质联用仪进行定量分析,从而建立卷烟主流烟气中4种杂环胺的测定方法.4种待测物的检出限在0.14～0.24ng/支之间,样品加标回收率在79.7%至86.2%之间.工作曲线的相关系数均大于0.997.应用该方法测定了国内在售的10个重点品牌卷烟样品,结果显示1-甲基-吡啶并[3,4-b]吲哚(Harman)、9H-...
A headspace-GC/MS method for the determination of dimethylcyclosiloxane in enameled wires was developed. The dimethylcyclosiloxane such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, dec...
A purge and tram combining with solid-phase extracting method/GC-MS was applied in pretreatment on the detection of serial sorts of organic contaminant, such as phenols, polycyclic aromatic hydrocarbo...
A GC/MS-SIM method for the determination of dimethyl fumarate in leather and leather products was developed. The dimethyl fumarate was extracted from leather by dehydrous ethyl acetate using ultrasoni...
GC/MS法检测包装材料中的三聚氰酸残留
cyanuric acid gas chromatography-mass spectrometry(GC/MS) package materials
2010/3/30
A GC/MS method was developed for the determination of cyanuric acid residue in package materials. The detection was performed by mass spectrometry with electro-spray ion mode. The results show that th...
An essential oil was extracted from the traditional Tibetan medicine of Pyrethrum tatsienense by steam distillation method. The chemical components of the essential oil were analyzed by gas chromatogr...
吹扫捕集-GC/MS/SIM法测定食品接触材料的单体迁移量
materials in contact with foodstuffs migration of monormer purg&trap-GC/MS/SIM
2010/3/30
A purg & trap-GC/MS/SIM method for the determination of the migration of monomers such as vinylidene chloride, acrylonitrilein and 1,3-butadiene in water food simulants of materials in contact with fo...