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发展了一种新型进样技术,使样品直接进入位于炉箱内的色谱柱内,样品的汽化,溶质聚焦和分离过程都在炉箱里一次控制完成,不再需要对进样器的温度和其它流量进行控制,极大地简化了进样器的设计和制作 ,改善了定量重复精度,减少了沸点歧视效应在炉箱里一次汽化 相似文献
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Expressions for the minimum detectable amount Qo and the minimum analyte concentration Co as functions of the chromatographic parameters are derived for both mass and concentration sensitive detectors. The effects of pressure drop, column inner diameter, and film thickness are given. The minimum analyte concentration for mass flow sensitive detectors, Com, can be reduced considerably by selecting the carrier gas velocity well above its optimum value (related to Hmin), however, at the cost of long columns and long analysis times. For Qo the improvements can be neglected, and so the analysis can best be performed at uopt. When the flow rate in the detector, Fd, is equal to the column flow rate Fc, the maximum permissible detector volume of concentration sensitive detectors is proportional to dc2 up to dc3, and so narrow bore columns require detectors of extremely small volume. Make-up gas has to be added when the actual volume is too large, thus worsening the detectability. Another approach, vacuum operation of the detector cell, appears to be very attractive. On the other hand, when wide bore columns are used in combination with small volume concentration sensitive detectors, very small values of Qoc and Coc are obtainable when the abundant carrier gas can be removed before entering the detector cell. Digital noise filtering can further reduce the obtainable Qo and Co values, especially for broad peaks and thus for wide bore columns. 相似文献
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本文介绍了用SE-30毛细管柱、高速率程序升温分离13种有机磷农药。其分离效果较好,分析速度较快,有良好的线性关系和重复性。 相似文献
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毛细管气相色谱法鉴定分析杆菌 总被引:1,自引:0,他引:1
本文利用OV-101熔融石英毛细管柱,对15种标准分枝杆菌的色谱特征进行了研究,得到了特异性指纹图。并对42株临床菌株进行了鉴别。 相似文献
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填充毛细管液相色谱-高温毛细管气相色谱在线联用分析润滑油 总被引:6,自引:0,他引:6
建立了一套填充毛细管液相色谱-高温毛细管气相色谱在线联用装置,并应用于润滑油的全组分分析。用正相填充毛细管柱液相色谱法进行样品族分离,将润滑油分成烷烃、单环芳烃、双环芳烃、三环芳烃及胶质(多环芳烃和极性物);特殊设计的多储存位接口可完成一次LC进样,对样品所有族组成的在线切割、贮存并无损失转入GC分析,保证了复杂样品全组分分析的准确定性和定量,缩短了分析时间。GC分析结果给出各族组分的相对含量和碳数分布。 相似文献
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填充毛细管液相色谱—毛细管气相色谱在线联用分析柴油全组成 总被引:5,自引:0,他引:5
采用填充毛细管液相色谱(PC-HPLC)与毛管气相色谱(CGC)在线联用技术分析柴油全组分。半填充硅胶、半填充氨基的PC-HPLC柱(0.32mm i.d)用于样品族分离(烷烃、单环芳烃、双环芳烃、三环芳烃和胶质)。经PC-HPLC分离后的各族组分(峰体积小于30μL)被依次存放在多位储存接口内,然后分别转入GC作单个组分定量分析,可得出各族组分的相对含量及烷烃的碳数的正异构分布。该方法是分析柴油 相似文献
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乙草胺、乙氧氟草醚的毛细管气相分析 总被引:3,自引:0,他引:3
采用毛细管气相法 ,以邻苯二甲酸二丁酯为内标 ,对乙草胺、乙氧氟草醚的混剂进行定量分析。条件为 60m× 0 53mmi d ,膜厚 1 5μm(SE 30固定液 )熔融石英毛细管柱 ,柱温为 2 30℃ ,检测器、汽化室温度为2 50℃ ,载气 (N2 )的流速为 1 5mL/min。该方法检测乙草胺和乙氧氟草醚含量 (质量分数 )的标准偏差分别为0 44%和 0 47% ,平均相对标准偏差 (RSD) (n =1 0 )分别为 0 79%和 0 88% ,平均回收率 (n =1 0 )分别为 99 3 %和 1 0 0 1 %。该方法能分开乙氧氟草醚的两个同分异构体 ,操作简便 ,定量准确。 相似文献
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《Analytical letters》2012,45(9):619-628
Abstract A glass injection system consisting of a packed precolumn and gasphase splitter has been developed for the introduction of derivatized biological samples on glass capillary columns. The precolumn provides complete sample evaporation before the splitter zone, traps contaminating nonvolatiles, and prevents decomposition or adsorption of components. In addition, a carrier gas control system is described that permits stable and repeatable adjustment of split ratio and capillary inlet pressure. The linearity of the splitter has been established using a hydrocarbon mixture covering the range of methylene unit (MU) values in which the steroid derivatives are eluted. 相似文献
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毛细管气相色谱法分析虾蛄肉中的脂肪酸 总被引:2,自引:0,他引:2
以快速脂肪提取器分别提取雄、雌虾蛄肉中脂肪,利用50m×0.35mmi.d.PEG-20M玻璃毛细管柱分离测定了雄、雌虾蛄肉中的脂肪酸,结合气相色谱/质谱法,鉴定出45个峰,分别占脂肪酸总量的99.2%和98.0%,其中不饱和脂肪酸分别为74.7%和71.5%。 相似文献