瓯柑石油醚提取物的GC-MS分析

为了研究瓯柑的挥发性成分和脂溶性成分, 采用GC-MS分析法进行分离鉴定, 并用面积归一法确定各成分的质量分数. 从瓯柑果肉石油醚提取物中分离鉴定出11种成分, 占总提取物的97.43%, 其主要成分为(Z, Z)-9, 12-十八碳二烯酸(37.46%)、γ-谷甾醇(22.91%);从瓯柑皮石油醚提取物中分离鉴定出10种成分, 占总提取物的99.79%, 其主要成分为柠檬烯(86.39%).     

吸附/一级热解吸/气相色谱联用测定室内空气中的挥发性有机物

本文以高聚物TenaxTA动态吸附,一级热解吸/毛细管气相色谱法联用测定室内空气中的挥发性有机物。优化了热解吸温度和热解吸时间,建立了苯、甲苯、乙酸正丁酯、乙苯、对二甲苯、苯乙烯、邻二甲苯、正十一烷等8种典型有机污染物的外标定量曲线,各化合物线性范围为103,相关系数R为0.9983～0.9999,最低检出浓度可达2×10-4mg/m3;考察了方法的重复性、热解吸率和残留率,并分析了实际空气样品。     

蛇油的挥发性成分分析和脱腥

采用水蒸汽蒸馏、黏土吸附、乙醇-乙酸乙酯共沸的方法除去蛇油的腥味,运用顶空固相微萃取(SPME)-气相色谱(GC)-质谱(MS)联用技术分析脱腥前后蛇油中挥发性成分的变化,并运用GC-MS联用技术分析脱腥后的蛇油中的脂肪酸.结果表明水蒸汽蒸馏是效果最佳的脱腥方法,它可使蛇油挥发性成分的量降至脱腥前的38%,使腥味的主要成分减少60%～100%,同时较大程度地保留了多不饱和脂肪酸.     

渐进子窗口比较法比较分析温郁金挥发油

运用化学计量学方法探索姜科植物温郁金不同药材的挥发油色谱指纹图谱中化学成分的异同.指纹图谱数据由高效液相色谱法获得,流动相为乙腈-0.20%磷酸水溶液梯度洗脱,流速1.0 mL/min,柱温20 ℃,光谱记录范围为200～340 nm.应用渐进子窗口比较法对中药温郁金、温莪术及片姜黄挥发油指纹图谱-光谱数据进行比较分析.经比较,温郁金和温莪术的色谱指纹图谱中,至少分别有15和6种单独的化学成分存在,两者的共有的化学成分有18种;温莪术与片姜黄的共有化学成分13种,而单独存在的化学成分至少分别有4和7种.     

Investigation into the determination of trimethylarsine in natural gas and its partitioning into gas and condensate phases using (cryotrapping)/gas chromatography coupled to inductively coupled plasma mass spectrometry and liquid/solid sorption techniques

Speciation of trialkylated arsenic compunds in natural gas, pressurized and stable condensate samples from the same gas well was performed using (Cryotrapping) Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry. The major species in all phases investigated was found to be trimethylarsine with a highest concentration of 17.8 ng/L (As) in the gas phase and 33.2 μg/L (As) in the stable condensate phase. The highest amount of trimethylarsine (121 μg/L (As)) was found in the pressurized condensate, along with trace amounts of non-identified higher alkylated arsines. Volatile arsenic species in natural gas and its related products cause concern with regards to environment, safety, occupational health and gas processing. Therefore, interest lies in a fast and simple field method for the determination of volatile arsenicals. Here, we use simple liquid and solid sorption techniques, namely absorption in silver nitrate solution and adsorption on silver nitrate impregnated silica gel tubes followed by total arsenic determination as a promising tool for field monitoring of volatile arsenicals in natural gas and gas condensates. Preliminary results obtained for the sorption-based methods show that around 70% of the arsenic is determined with these methods in comparison to volatile arsenic determination using GC-ICP-MS. Furthermore, an inter-laboratory- and inter-method comparison was performed using silver nitrate impregnated silica tubes on 14 different gas samples with concentrations varying from below 1 to 1000 μg As/m³ natural gas. The results obtained from the two laboratories differ in a range of 10 to 60%, but agree within the order of magnitude, which is satisfactory for our purposes.     

气相色谱法测定姜味草挥发油中橙花醛与香叶醛

采用水蒸气蒸馏法提取姜味草挥发油,用气相色谱法-氢火焰离子化检测器测定挥发油中橙花醛和香叶醛的含量。橙花醛和香叶醛的线性范围分别为0.0971～0.5826g·L~（-1）和0.1152～0.6912g·L~（-1）方法用于测定4批次姜味草挥发油中橙花醛与香叶醛的含量,橙花醛与香叶醛的质量分数分别为25.00%,29....     

土壤中挥发性有机化合物的GC-MS测定

利用气相色谱－质谱联用技术，对某废弃化工厂原厂区及附近农田的土壤中可能存在的60种挥发性有机化合物进行了定性和定量分析；采用质量保证和质量控制步骤对分析结果进行监测，结果令人满意。     

臭椿籽挥发油的化学成分分析

采用水蒸气蒸馏法对甘肃天水产的臭椿籽挥发油进行提取，挥发油得率约为2．1％(w)；用气相色谱-质谱联用技术对挥发性成分进行了分析，鉴定了43个化合物，占挥发油相对含量的96．3％；主要成分为脂肪酸及酯、脂肪烃及甾族化合物，其中含量较高的有亚油酸、油酸、蓖麻酸和蓖麻酸甲酯。     

铈基催化剂在挥发性有机物催化燃烧治理中的研究进展

铈基催化剂由于其特殊的氧化还原性能在催化反应中得到了广泛应用,在非均相催化反应中其表面性质尤为重要.二氧化铈晶格中的氧缺陷对表面催化反应起着非常重要的作用,而二氧化铈可以有效调节催化剂表面酸碱性,修饰催化活性中心的结构,提高催化剂的储放氧能力,增强其结构稳定性和提高活性组分的分散度等.我们分别从二氧化铈催化剂的制备方法...     

卵巢癌、成熟型畸胎瘤与正常血液样本中挥发性组分的研究

采用顶空固相微萃取(HS-SPME)与气相色谱-质谱(GC-MS)联用技术,对12例卵巢癌、17例成熟型畸胎瘤与16例正常血液样本的挥发性组分进行研究,对影响提取效果的实验因素进行了优化.在最优条件下共检出28种挥发性组分,以各组分峰面积为变量,用SIMCA-P软件进行偏最小二乘判别分析(PLS-DA),3组样本被明显区分.同时,依据PLS-DA载荷图得到8种具有显著性差异的标志物,其中己醛、蘑菇醇的变化与其在肝癌、肺癌患者血液中的变化一致,可作为诊断卵巢癌和成熟型畸胎瘤的挥发性生物标志物.