901 resultados para GC-MS analysis


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本文采用XAD-2和XAD-8(1:1)混合树脂现场富集采样,循环提取器提取,毛细管GC/MS定性的方法,通过对冬夏两季的采样分析,初步分析了某地自来(饮用)水中非挥发性有机氯化产物。从夏天自来水中检测出了28种有机氯化合物。从冬天自来水中只检出了1种有机氯化合物。

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<正> 1 简介与实验大蒜(Allium sativun L.)系石蒜科葱属植物,世界各地均有栽培,大蒜作为民间药物广泛应用于世界各地。我国用大蒜作为药物有悠久的历史,大蒜在临床上的重要作用引起了广大化学家的重视,对大蒜的分析国内外均有报道。Stoll 等人认为大蒜的主要成分是大蒜辣素(Allicm),其结构式为 CH_2=

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白暨豚是一种珍稀水生动物.本文报道了运用 Dexsil-300GC 毛细管柱色质联用仪,对白(?)豚油中脂肪酸进行了分析鉴定,并检测到了22种脂肪酸,其中主要脂肪酸是十四碳烯酸、十六碳烯酸和十八碳烯酸.

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建立了气相色谱-质谱-选择离子监测(GC-MS-SIM)同时测定土壤中10种农药(三嗪类除草剂、酰胺类除草剂和有机氯农药)的多残留分析方法.样品采用正己烷/丙酮(1:1,V/V)超声提取、氟罗里硅土柱层析净化、GC-MS-SIM测定.10种农药在0.01(0.02)—1.0(2.0)mg.l-1范围内线性良好,相关系数介于0.9963—0.9998之间;在10,50和250ng.g-1添加水平下,平均回收率介于81%—117%之间,相对标准偏差均小于14.4%;方法检出限达到ppb至sub-ppb级(0.1—1.3ng.g-1).将此方法应用于辽宁省不同性质土壤中70个实际土壤样品的分析,阿特拉津、乙草胺、六氯苯、丁草胺、狄氏剂和艾氏剂有检出,该法对不同性质土壤具有广泛适用性.

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A high-throughput screening system for secondary catalyst libraries has been developed by incorporation of an 80-pass reactor and a quantified multistream mass spectrometer screening (MSMSS) technique. With a low-melting alloy as the heating medium, a uniform reaction temperature could be obtained in the multistream reactor (maximum temperature differences are less than 1 K at 673 K). Quantification of the results was realized by combination of a gas chromatogram with the MSMSS, which could provide the product selectivities of each catalyst in a heterogeneous catalyst library. Because the catalyst loading of each reaction tube is comparable to that of the conventional microreaction system and because the parallel reactions could be operated under identical conditions (homogeneous temperature, same pressure and WHSV), the reaction results of a promising catalyst selected from the library could be reasonably applied to the further scale-up of the system. The aldol condensation of acetone, with obvious differences in the product distribution over different kind of catalysts, was selected as a model reaction to validate the screening system.

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用气相色谱(GC)与气相色谱—质谱(GC-MS)联用技术对哈士蟆油中的脂肪酸组成进行了定性与定量分析,共鉴定出10种脂肪酸并用气相色谱法作了定量,对所得的结果进行了讨论。

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采用气相色谱/质谱(GC/MS)联用技术对山东泰山产单叶蔓荆子挥发油的化学成分进行了分析,分离出30多个峰,确认了其中28种成分,占总离子流的95%以上,并对挥发油的主要化学成分Δ3-蒈烯,用气相色谱/傅里叶红外光谱(GC/FTIR)法进行了验证。

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本文应用色谱—质谱(GS/MS)及裂解色谱质谱(Py/GC/MS)研究了二甲基乙氧基乙烯基硅烷(VDMES)等离子体聚合的气体冷凝物及聚合物膜。鉴别出多种化合物,并推导了等离子体聚合的反应历程,进而得到了气相反应与表面反应的实验依据。