Gas Chromatography Mass Spectrometry testing, or GC/MS testing, combines two different spectrometry techniques into a single process, making it one of the most broadly useful, accurate, and reliable methods of substance testing available today. Here’s everything you need to know about GC/MS tes...
No matter how carefully the distillation process is carried out, essential oils should be tested for their purity and potency before being packaged. Quality testing ensures that every bottle of essential oil contains nothing but 100 percent pure volatile aromatic compounds at the correct ratios to al...
结果见表3 表3 仪器检出限 数据获取方式 浓度水平(μg/ml) 信噪比S/N 仪器检出限(μg/ml) SCAN 0.8 10.6 0.2264 SIM 0.8 120.5 0.0199 2.5.2、方法检测限 根据NATA(National Association of TestingAuthoritiesAustralia)给出的化学测试方法进行测试,检测限 (MDL)实验方法为:进行3个浓度水平的添加回收实验,...
现代分析中,很多化合物的检测浓度要求越来越低,因此对仪器的检测能力要求越来越高,而仪器检测限(IDL)是直接体现检测能力的重要参考指标之一。 在新技术说明TN10494中,我们选取八氟萘 (OFN)(GC-MS 系统中一种常用的参照物)在三台独立的 Thermo Scientific ISQ LT单四极杆GC-...
A GCMS prototype based on the Vehicle Cabin AirMonitor was constructed and equipped with one such water sampling module to undergotesting at the Environmental Chamber at Marshall Space Flight Center. This testinginvolved simulation of three crew members over the span of a week while sampling water...
固相萃取GCMS法测定水中半挥发性有机污染物的研究 苏州科技学院 硕士学位论文 固相萃取-GC/MS法测定水中半挥发性有机污染物的研究 姓名：王英 申请学位级别：硕士 专业：环境工程 指导教师：张占恩 20090501
TestingCenter;StateKeyLaboratoryBreeding Base of CrimeScene Evidence,Shanghai200083,China) Abstract:Objective Toestablisha gaschromatography-massspectrometry(GC-MS)method with special mass spectralibrary searching fortheidentificationofthe new—typedrugs.Method ...
GCMS as the main detection method, this method generates derivative cyclohexanol nitrites in food cyclohexylamino sodium after ultrasonic extraction, under ice-cooling, the reaction with sodium nitrite occurs diazo derivatives were separated into the GCMS for testing. The results showed that the lowest ...
将样品放入密封袋中,密封后充入氮气,在一定温度下加热使样品的VOC气体散发至袋子中,用Tenax管对苯烃类物质进行采集,用TD-GCMS进行检测;用DNPH管对醛酮类物质进行采集,用HPLC进行检测分析。 袋子法VOC采样图(图片来源于网络) 03、Bag-TD-GCMS袋子法测试案例 ...
答:对于EI离子源,我们知道常使用的电离能量为70eV,包括标准的质谱数据库收集的几十万张化合物的质谱图都是在70eV的EI离子源下生成的。下面就来说明一下,首先我们通过一个分子量为88的化合物质谱图与离子源电离能的关系,看看不同电离能下,化合物的质谱图有何区别,质谱图如下: ...